Lineage for Class d: Alpha and beta proteins (a+b)

  1. Root: SCOPe 2.02
  2. 1190016Class d: Alpha and beta proteins (a+b) [53931] (376 folds)

Folds:

  1. 1190017d.1: Microbial ribonucleases [53932] (1 superfamily)
    single helix packs against antiparallel beta-sheet
  2. 1190374d.2: Lysozyme-like [53954] (1 superfamily)
    common alpha+beta motif for the active site region
  3. 1191813d.3: Cysteine proteinases [54000] (1 superfamily)
    consists of one alpha-helix and 4 strands of antiparallel beta-sheet and contains the catalytic triad Cys-His-Asn
  4. 1192553d.4: His-Me finger endonucleases [54059] (1 superfamily)
    core: (alpha)-beta-omega_loop-beta-alpha; embeded in larger different structures
  5. 1192691d.5: RNase A-like [54075] (1 superfamily)
    contains long curved beta-sheet and 3 helices
  6. 1193177d.6: Prion-like [54097] (1 superfamily)
    beta-alpha-beta-alpha(2); antiparallel beta-ribbon
  7. 1193246d.7: LysM domain [54105] (1 superfamily)
    beta-alpha(2)-beta; antiparallel strands
  8. 1193256d.8: Urease, gamma-subunit [54110] (1 superfamily)
    alpha(3)-beta(2); antiparallel hairpin
  9. 1193305d.9: IL8-like [54116] (2 superfamilies)
    beta(3)-alpha
  10. 1193615d.10: DNA-binding domain [54170] (1 superfamily)
    beta(3)-alpha; 2 layers: alpha/beta
  11. 1193650d.11: Penicillin-binding protein 2x (pbp-2x), c-terminal domain [54183] (1 superfamily)
    alpha1-beta3; 2 layers: alpha/beta; order 132
  12. 1193691d.12: Ribosomal proteins S24e, L23 and L15e [54188] (1 superfamily)
    beta-(alpha)-beta-alpha-beta(2); 3 layers: alpha/beta/alpha; antiparallel beta-sheet: order 1243
  13. 1193860d.13: HIT-like [54196] (2 superfamilies)
    alpha-beta(3)-alpha-beta(2); 3 layers: alpha/beta/alpha
  14. 1194044d.14: Ribosomal protein S5 domain 2-like [54210] (1 superfamily)
    core: beta(3)-alpha-beta-alpha; 2 layers: alpha/beta; left-handed crossover
  15. 1194674d.15: beta-Grasp (ubiquitin-like) [54235] (14 superfamilies)
    core: beta(2)-alpha-beta(2); mixed beta-sheet 2143
  16. 1196365d.16: FAD-linked reductases, C-terminal domain [54372] (1 superfamily)
    alpha+beta sandwich
  17. 1196747d.17: Cystatin-like [54402] (7 superfamilies)
    Core: alpha-beta(4); helix packs against coiled antiparallel beta-sheet
  18. 1197919d.18: ssDNA-binding transcriptional regulator domain [54446] (1 superfamily)
    helix-swapped dimer of beta(4)-alpha motifs
  19. 1197982d.19: MHC antigen-recognition domain [54451] (1 superfamily)
    dimeric
  20. 1198735d.20: UBC-like [54494] (1 superfamily)
    alpha-beta(4)-alpha(3); core: meander beta-sheet plus one helix 2
  21. 1199029d.21: Diaminopimelate epimerase-like [54505] (1 superfamily)
    mixed beta-sheet folds into a barrel (n=8, S=14) around the central helix
  22. 1199112d.22: GFP-like [54510] (1 superfamily)
    beta-sheet folds into a barrel (n=11, S=14) around the central helix
  23. 1199685d.23: Tubby C-terminal domain-like [54517] (1 superfamily)
    beta-sheet folds into a barrel (n=12, S=12) around the central helix
  24. 1199703d.24: Pili subunits [54522] (1 superfamily)
    contains very long N-terminal helix, which end is packed against beta-sheet
  25. 1199803d.25: Mitochondrial glycoprotein MAM33-like [54528] (1 superfamily)
    core: beta(7)-alpha(2); N- and C-terminal extensions form a coiled coil subdomain
  26. 1199823d.26: FKBP-like [54533] (3 superfamilies)
    core: beta(2)-alpha-beta(2); antiparallel beta-sheet
  27. 1200238d.27: Ribosomal protein S16 [54564] (1 superfamily)
    beta(4)-alpha-beta; 2 layers: alpha/beta; mixed beta-sheet, order: 51234
  28. 1200309d.28: Ribosomal protein S19 [54569] (1 superfamily)
    alpha-beta-X-beta(2); 2 layers: alpha/beta; mixed beta-sheet, order: 123
  29. 1200379d.29: Ribosomal protein L31e [54574] (1 superfamily)
    beta-alpha-beta-(alpha)-beta(2); 2 layers: alpha/beta; mixed beta-sheet, order: 1342
  30. 1200424d.30: Allophycocyanin linker chain (domain) [54579] (1 superfamily)
    beta(2)-alpha-beta; 2 layers: alpha/beta
  31. 1200431d.31: Cdc48 domain 2-like [54584] (1 superfamily)
    beta-alpha-beta(3); 2 layers: alpha/beta
  32. 1200465d.32: Glyoxalase/Bleomycin resistance protein/Dihydroxybiphenyl dioxygenase [54592] (1 superfamily)
    beta-alpha-beta(3); 2 layers: alpha/beta
  33. 1200847d.33: SecB-like [54610] (1 superfamily)
    beta(4)-alpha(2); two layers: alpha/beta; antiparallel sheet: order 1432
  34. 1200879d.34: DNA-binding domain of Mlu1-box binding protein MBP1 [54615] (1 superfamily)
    beta(4)-alpha(2)-beta(2)-alpha; antiparallel sheet: order 123465
  35. 1200887d.35: Heme-binding protein A (HasA) [54620] (1 superfamily)
    beta-alpha-beta(6)-alpha(2); antiparallel sheet: order 165432
  36. 1200913d.36: Chalcone isomerase [54625] (1 superfamily)
    beta(3)-alpha(2)-beta-alpha(2)-beta3; 2 layers alpha/beta; antiparallel sheet: order 1234567
  37. 1200936d.37: CBS-domain pair [54630] (1 superfamily)
    duplication: tandem repeat of two beta-X-beta-alpha-beta(2)-alpha motifs of similar sequences; 4 layers: a/b/b/a
  38. 1201078d.38: Thioesterase/thiol ester dehydrase-isomerase [54636] (1 superfamily)
    core: beta-alpha-beta(4); 2 layers: alpha/beta
  39. 1201651d.39: DLC [54647] (1 superfamily)
    core: beta-alpha(2)-beta-X-beta(2); 2 layers: alpha/beta; antiparallel beta-sheet: order 1342
  40. 1201702d.40: CI-2 family of serine protease inhibitors [54653] (1 superfamily)
    alpha+beta sandwich; loop across free side of beta-sheet
  41. 1201772d.41: alpha/beta-Hammerhead [54664] (5 superfamilies)
    core: beta-BETA-alpha-beta-BETA-beta-alpha; contains a beta-hammerhead motif similar to that in barrel-sandwich hybrids
  42. 1202046d.42: POZ domain [54694] (1 superfamily)
    core: beta(2)-alpha(2)-beta(2)-alpha(2); 2 layers a/b; mixed sheet: 2143
  43. 1202200d.43: EF-Ts domain-like [54712] (2 superfamilies)
    beta(2)-alpha(n)-beta; 2 layers a/b; antiparallel sheet: 123
  44. 1202223d.44: Fe,Mn superoxide dismutase (SOD), C-terminal domain [54718] (1 superfamily)
    alpha-beta(2)-alpha-beta-alpha(2); 3 strands of antiparallel sheet: 213
  45. 1202470d.45: ClpS-like [54735] (1 superfamily)
    beta-alpha(2)-beta-alpha-beta; 2 layers, alpha/beta
  46. 1202543d.47: Ribosomal L11/L12e N-terminal domain [54746] (1 superfamily)
    beta-alpha(2)-beta(2); 2 layers, alpha/beta; antiparallel beta-sheet: order 123
  47. 1202612d.48: Anti-LPS factor/recA domain [54751] (2 superfamilies)
    alpha-beta(3)-alpha(2); 2 layers, alpha/beta
  48. 1202644d.49: Signal recognition particle alu RNA binding heterodimer, SRP9/14 [54761] (1 superfamily)
    (beta)-alpha-beta(3)-alpha; 2 layers, alpha/beta
  49. 1202665d.50: dsRBD-like [54767] (5 superfamilies)
    alpha-beta(3)-alpha; 2 layers: alpha/beta
  50. 1202875d.51: Eukaryotic type KH-domain (KH-domain type I) [54790] (1 superfamily)
    beta-alpha(2)-beta(2)-alpha; 2 layers: alpha/beta
  51. 1202974d.52: Alpha-lytic protease prodomain-like [54805] (10 superfamilies)
    core: alpha-beta(2)-(alpha)-beta; 2 layers: alpha/beta
  52. 1203196d.53: Ribosomal protein S3 C-terminal domain [54820] (1 superfamily)
    alpha(2)-beta(4); 2 layers: alpha/beta; antiparallel beta-sheet: order 2143
  53. 1203262d.54: Enolase N-terminal domain-like [54825] (1 superfamily)
    beta(3)-alpha(3); meander and up-and-down bundle
  54. 1203503d.55: Ribosomal protein L22 [54842] (1 superfamily)
    beta-alpha(3)-beta(2); 2 layers: alpha/beta; related to the enolase/MLE N-domain fold by a circular permutation
  55. 1203618d.56: GroEL-intermediate domain like [54848] (1 superfamily)
    3-helical bundle packed against 3-stranded mixed beta-sheet
  56. 1203804d.57: DNA damage-inducible protein DinI [54856] (1 superfamily)
    beta-alpha-beta(2)-alpha; 2 layers: alpha/beta; mixed sheet 213; crossing loops
  57. 1203810d.58: Ferredoxin-like [54861] (59 superfamilies)
    alpha+beta sandwich with antiparallel beta-sheet; (beta-alpha-beta)x2
  58. 1207926d.59: Ribosomal protein L30p/L7e [55128] (1 superfamily)
    core: beta-alpha-beta-alpha-beta; antiparallel beta-sheet: order 312; some similarity to the ferredoxin-like fold
  59. 1208022d.60: Probable bacterial effector-binding domain [55135] (1 superfamily)
    duplication of beta-alpha-beta(2) motif: antiparallel beta sheet forms barrel (n=6, S=12)
  60. 1208052d.61: LigT-like [55143] (1 superfamily)
    duplication of beta-alpha-beta-alpha-beta motif: antiparallel beta sheet forms barrel (n=6, S=8) similar to the barrel of prokaryotic DNA topoisomerases I and III
  61. 1208088d.62: Pepsin inhibitor-3 [55148] (1 superfamily)
    duplication of beta(3)-alpha(2) motif: meander beta sheets form barrel-like structure
  62. 1208095d.63: CYTH-like phosphatases [55153] (1 superfamily)
    duplication of beta-alpha-beta(3) motif: antiparallel beta sheet forms wide barrel (n=8, S=16) with a channel running through it
  63. 1208147d.64: eIF1-like [55158] (2 superfamilies)
    beta(2)-alpha-beta(2)-alpha-beta; 2 layers: alpha/beta; mixed beta-sheet: order 51243
  64. 1208182d.65: Hedgehog/DD-peptidase [55165] (1 superfamily)
    alpha-beta(2)-alpha-beta(2); 2 layers: alpha/beta
  65. 1208250d.66: Alpha-L RNA-binding motif [55173] (1 superfamily)
    alpha(2)-beta(2)-loop-beta; 2 layers: alpha/beta
  66. 1208357d.67: RRF/tRNA synthetase additional domain-like [55185] (4 superfamilies)
    core: alpha-beta(2)-alpha-beta(2); 2 layers: alpha/beta
  67. 1208441d.68: IF3-like [55199] (8 superfamilies)
    beta-alpha-beta-alpha-beta(2); 2 layers; mixed sheet 1243, strand 4 is antiparallel to the rest
  68. 1208735d.70: Yeast killer toxins [55220] (1 superfamily)
    beta-alpha-beta(2)-alpha-beta(2); 2 layers, alpha/beta; left-handed crossover connection
  69. 1208749d.71: Cell division protein MinE topological specificity domain [55228] (1 superfamily)
    dimer of alpha-beta(2) motifs ; 2 layers, alpha/beta
  70. 1208756d.72: Cyanase C-terminal domain [55233] (1 superfamily)
    intertwined dimer of alpha-beta(2) motifs ; 2 layers, alpha/beta
  71. 1208801d.73: RuBisCO, small subunit [55238] (1 superfamily)
    alpha-beta(2)-alpha-beta(2); 2 layers, alpha/beta
  72. 1209032d.74: DCoH-like [55247] (5 superfamilies)
    beta(2)-alpha-beta(2)-alpha; 2 layers, alpha/beta
  73. 1209287d.75: MutS N-terminal domain-like [55266] (2 superfamilies)
    beta(2)-alpha-beta(2)-alpha-beta(2); 2 layers, alpha/beta
  74. 1209346d.76: GYF/BRK domain-like [55276] (2 superfamilies)
    beta(2)-alpha-beta(2)-alpha; 2 layers, alpha/beta
  75. 1209370d.77: RL5-like [55281] (1 superfamily)
    beta-alpha-beta(2)-alpha-beta(3)-alpha; 2 layers, alpha/beta; antiparallel beta-sheet: order 231654
  76. 1209496d.78: RPB5-like RNA polymerase subunit [55286] (1 superfamily)
    core: beta-alpha-beta-alpha-beta(2); 2 layers, alpha/beta
  77. 1209532d.79: Bacillus chorismate mutase-like [55297] (9 superfamilies)
    core: beta-alpha-beta-alpha-beta(2); mixed beta-sheet: order: 1423, strand 4 is antiparallel to the rest
  78. 1210202d.80: Tautomerase/MIF [55330] (1 superfamily)
    (beta-alpha-beta)2; 2 layers: alpha/beta; mixed beta-sheet
    generally forms trimers with three closely packed beta-sheets
  79. 1210563d.81: FwdE/GAPDH domain-like [55346] (4 superfamilies)
    core: alpha-beta-alpha-beta(3); mixed sheet: 2134, strand 2 is parallel to strand 1
  80. 1211148d.82: N domain of copper amine oxidase-like [55382] (5 superfamilies)
    alpha-beta(5)-alpha; 2 layers: alpha/beta; meander antiparallel sheet
  81. 1211233d.83: Aha1/BPI domain-like [55393] (2 superfamilies)
    core: [beta]-alpha-beta(5)-alpha; 2 layers: alpha/beta; antiparallel beta-sheet, meander
  82. 1211251d.84: Subtilisin inhibitor [55398] (1 superfamily)
    alpha+beta sandwich
  83. 1211268d.85: RNA bacteriophage capsid protein [55404] (1 superfamily)
    6-standed beta-sheet followed with 2 helices; meander
  84. 1211433d.86: eIF4e-like [55417] (1 superfamily)
    beta(2)-alpha-beta(2)-alpha-beta(2)-alpha-beta-2; 2 layers: alpha/beta; antiparallel sheet: 21356478
  85. 1211494d.87: CO dehydrogenase flavoprotein C-domain-like [55423] (2 superfamilies)
    core: beta(3,4)-alpha(3); alpha+beta sandwich
  86. 1211689d.88: SRF-like [55454] (1 superfamily)
    alpha-beta(2)-alpha; dimer; 3 layers a/b/a; antiparallel beta-sheet
  87. 1211733d.89: Origin of replication-binding domain, RBD-like [55463] (1 superfamily)
    alpha-beta-alpha-beta(2)-alpha-beta-alpha-beta; 3 layers: a/b/a; antiparallel sheet 41325
  88. 1211817d.90: FMN-dependent nitroreductase-like [55468] (1 superfamily)
    core: (alpha-beta-alpha-beta)2; 3 layers a/b/a; antiparallel beta-sheet: 1243
  89. 1211967d.91: N-terminal domain of eukaryotic peptide chain release factor subunit 1, ERF1 [55480] (1 superfamily)
    alpha-beta-alpha(2)-beta(3)-alpha; 3 layers a/b/a; antiparallel beta-sheet: 4123
  90. 1211973d.92: Zincin-like [55485] (2 superfamilies)
    contains mixed beta sheet with connection over free side of the sheet
  91. 1212958d.93: SH2-like [55549] (1 superfamily)
    3 layers: a/b/a; antiparallel beta-sheet of 5 strands is flaked by two helices
  92. 1213350d.94: HPr-like [55593] (2 superfamilies)
    beta-alpha-beta(2)-alpha-beta-alpha; 2 layers: a/b; antiparallel sheet 1423
  93. 1213440d.95: Homing endonuclease-like [55603] (2 superfamilies)
    alpha-beta(2)-alpha-beta(2)-alpha; 2 layers: a/b; antiparallel sheet 1243
  94. 1213557d.96: T-fold [55619] (2 superfamilies)
    beta(2)-alpha(2)-beta(2); 2 layers: alpha/beta; antiparallel sheet 1234
    tunnel-shaped: its known members form wide oligomeric barrels different sizes
  95. 1214017d.97: Cell cycle regulatory proteins [55636] (1 superfamily)
    beta(2)-alpha(2)-beta(2); 2 layers: alpha/beta; antiparallel sheet 1243
    can form strand-exchange dimers
  96. 1214046d.98: BLIP-like [55647] (2 superfamilies)
    alpha(2)-beta(4); 2 layers: alpha/beta
  97. 1214103d.99: Ribosomal protein L9 C-domain [55652] (1 superfamily)
    alpha-beta-alpha(2)-beta(2); 2 layers: alpha/beta
  98. 1214149d.100: MbtH/L9 domain-like [55657] (2 superfamilies)
    beta(2)-alpha-beta-alpha; 3 layers: alpha/beta/alpha
  99. 1214221d.101: Ribonuclease PH domain 2-like [55665] (1 superfamily)
    beta(2)-alpha-beta(2)-alpha; 3 layers: alpha/beta/alpha; antiparallel sheet: order 2134
  100. 1214390d.102: Regulatory factor Nef [55670] (1 superfamily)
    alpha(2)-beta(4)-alpha; 3 layers: alpha/beta/alpha
  101. 1214415d.103: CytB endotoxin-like [55675] (1 superfamily)
    core: beta-alpha(2)-beta-alpha(2)-beta(4); 3 layers: a/b/a
  102. 1214435d.104: Class II aaRS and biotin synthetases [55680] (1 superfamily)
    contains large mixed beta-sheet
  103. 1214737d.105: Subdomain of clathrin and coatomer appendage domain [55710] (1 superfamily)
    beta-alpha-beta-alpha-beta(4)-alpha; 3 layers: a/b/a; bifurcated antiparallel beta-sheet
  104. 1214766d.106: SCP-like [55717] (1 superfamily)
    alpha-beta(3)-(crossover)-beta-(alpha)-beta; 3 layers: a/b/a; antiparallel beta-sheet of 5 strands; order: 32145
  105. 1214825d.107: Mog1p/PsbP-like [55723] (1 superfamily)
    (beta-hairpin)-beta(3)-alpha-beta(4)-alpha; 3 layers: a/b/a; antiparallel beta-sheet of 7 strands; order: 1237654
  106. 1214850d.108: Acyl-CoA N-acyltransferases (Nat) [55728] (1 superfamily)
    3 layers: a/b/a; contains mixed beta-sheet
  107. 1215401d.109: Gelsolin-like [55752] (3 superfamilies)
    3 layers: a/b/a; contains mixed beta-sheet
  108. 1215605d.110: Profilin-like [55769] (10 superfamilies)
    core: 2 alpha-helices and 5-stranded antiparallel sheet: order 21543; 3 layers: alpha/beta/alpha
  109. 1216139d.111: PR-1-like [55796] (1 superfamily)
    alpha-beta-alpha-beta-alpha(2)-beta(2); 3 layers, alpha/beta/alpha; mixed sheet: order 1342
  110. 1216157d.112: Phoshotransferase/anion transport protein [55803] (1 superfamily)
    beta-alpha(2)-beta(3)-alpha(3); 3 layers, alpha/beta/alpha; mixed sheet: order 1342; loop crossing
  111. 1216197d.113: Nudix [55810] (1 superfamily)
    beta(2)-alpha-beta(3)-alpha; 3 layers: alpha/beta/alpha; mixed sheet
    contains beta-grasp motif
  112. 1216474d.114: 5'-nucleotidase (syn. UDP-sugar hydrolase), C-terminal domain [55815] (1 superfamily)
    core: alpha-beta(2)-alpha-beta(2)-alpha-beta; 3 layers; mixed sheet: order 31425
  113. 1216499d.115: YrdC/RibB [55820] (1 superfamily)
    core: alpha-beta(2)-alpha-beta-alpha(2)-beta(2)-alpha-beta-alpha-beta; 3 layers; mixed twisted sheet of 7 strands; order 7126354; strands 7 and 1 are parallel to each other
  114. 1216563d.116: YbaK/ProRS associated domain [55825] (1 superfamily)
    core: alpha-beta-alpha-beta(2)-(alpha-beta)2-alpha-beta(2)-alpha-beta; 3 layers; bifurcated mixed sheet
  115. 1216602d.117: Thymidylate synthase/dCMP hydroxymethylase [55830] (1 superfamily)
    contains large mixed beta-sheet
  116. 1216883d.118: N-acetylmuramoyl-L-alanine amidase-like [55845] (1 superfamily)
    contains mixed beta-sheet
  117. 1217056d.120: Cytochrome b5-like heme/steroid binding domain [55855] (1 superfamily)
    beta-alpha-beta(2)-alpha(1,2)-(beta)-alpha(2)-beta; 3 layers: a/b/a; antiparallel beta-sheet, order: 1532(4)
  118. 1217150d.121: DNA topoisomerase I domain [55868] (1 superfamily)
    beta(2)-alpha-beta-(alpha)-beta(2); left-handed crossover between strands 2 & 3
  119. 1217156d.122: ATPase domain of HSP90 chaperone/DNA topoisomerase II/histidine kinase [55873] (1 superfamily)
    8-stranded mixed beta-sheet; 2 layers: alpha/beta
  120. 1217518d.123: Sporulation response regulatory protein Spo0B [55889] (1 superfamily)
    core: alpha-beta-alpha-beta(2)-(alpha)-beta(2)
  121. 1217533d.124: Ribonuclease Rh-like [55894] (1 superfamily)
    alpha+beta fold
  122. 1217580d.125: Ornithine decarboxylase C-terminal domain [55903] (1 superfamily)
    complex alpha+beta motif
  123. 1217588d.126: Pentein, beta/alpha-propeller [55908] (1 superfamily)
    duplication: composed of 5 alpha-beta(2)-alpha-beta units arranged around pseudo fivefold axis
  124. 1217738d.127: Creatinase/aminopeptidase [55919] (1 superfamily)
    duplication: composed of two very similar alpha+beta folds
  125. 1217886d.128: Glutamine synthetase/guanido kinase [55930] (1 superfamily)
    duplication: common core consists of two beta-alpha-beta2-alpha repeats
  126. 1218105d.129: TBP-like [55944] (11 superfamilies)
    beta-alpha-beta(4)-alpha
  127. 1218695d.130: S-adenosylmethionine synthetase [55972] (1 superfamily)
    duplication: consists of 3 similar intertwined domains
    structural repeat: beta-alpha-beta(2)-alpha-beta; two layers, alpha/beta
  128. 1218783d.131: DNA clamp [55978] (1 superfamily)
    contains two helices and two beta sheets
    duplication: fold has internal pseudo two-fold symmetry
  129. 1218971d.133: Molybdenum cofactor-binding domain [56002] (1 superfamily)
    beta(2)-alpha-beta-alpha-beta; 2 layers: a/b; mixed sheet: order 1243: crossing loops
  130. 1219031d.134: Nitrite and sulphite reductase 4Fe-4S domain-like [56013] (1 superfamily)
    beta-alpha-beta-alpha-beta(3)-alpha(2,3); mixed sheet: order 12345; left-handed crossover connection between strands 1 and 2
  131. 1219088d.135: The spindle assembly checkpoint protein mad2 [56018] (1 superfamily)
    core: alpha(2)-beta(2)-alpha-beta; mixed sheet: order 213
  132. 1219122d.136: Phospholipase D/nuclease [56023] (1 superfamily)
    beta-alpha-beta-alpha-beta-alpha-beta(4)-alpha; mixed sheet: order 1765234
  133. 1219230d.137: Monooxygenase (hydroxylase) regulatory protein [56028] (1 superfamily)
    corner-like structure formed by two sheets and filled in with 2-3 helices
  134. 1219270d.139: PurM C-terminal domain-like [56041] (1 superfamily)
    3 layers: alpha/beta/alpha; partial topological similarity to the ferredoxin-like fold
  135. 1219328d.140: Ribosomal protein S8 [56046] (1 superfamily)
    consists of 2 different alpha+beta subdomains arranged in a 4-layer structure: b/a/b/a
  136. 1219397d.141: Ribosomal protein L6 [56052] (1 superfamily)
    consists of two beta-sheets and one alpha-helix packed around single core
  137. 1219586d.142: ATP-grasp [56058] (2 superfamilies)
    Consists of two subdomains with different alpha+beta folds
    shares functional and structural similarities with the PIPK and protein kinase superfamilies
  138. 1219939d.143: SAICAR synthase-like [56103] (1 superfamily)
    consists of two alpha+beta subdomains
  139. 1220003d.144: Protein kinase-like (PK-like) [56111] (1 superfamily)
    consists of two alpha+beta domains, C-terminal domain is mostly alpha helical
  140. 1222156d.145: FAD-binding/transporter-associated domain-like [56175] (1 superfamily)
    consists of two alpha+beta subdomains
  141. 1222343d.146: Uridine diphospho-N-Acetylenolpyruvylglucosamine reductase, MurB, C-terminal domain [56193] (1 superfamily)
    consists of two alpha+beta subdomains
  142. 1222355d.147: Methenyltetrahydromethanopterin cyclohydrolase [56198] (1 superfamily)
    consists of two alpha+beta subdomains
  143. 1222368d.148: Hect, E3 ligase catalytic domain [56203] (1 superfamily)
    consists of two alpha+beta domains; the N-terminal domain is array of helices and beta-hairpins; the C-terminal domain is an a/b sandwich with one left-handed beta-alpha(n)-beta unit; conformational flexibility of domain orientation
  144. 1222382d.149: Nitrile hydratase alpha chain [56208] (1 superfamily)
    4 layers a/b/b/a; inside is a sandwich of two 2-stranded beta-sheets
  145. 1222432d.150: 4'-phosphopantetheinyl transferase [56213] (1 superfamily)
    beta-alpha(3)-beta(2) motif
  146. 1222496d.151: DNase I-like [56218] (1 superfamily)
    contains beta-sandwich; duplication of alpha+beta motif
  147. 1222597d.152: Aldehyde ferredoxin oxidoreductase, N-terminal domain [56227] (1 superfamily)
    contains sandwich; duplication of alpha+beta motif with single mixed sheet
    motif: beta(2)-alpha-beta(3)-alpha-beta; strand order 216345, strands 1 and 6 are parallel
  148. 1222614d.153: Ntn hydrolase-like [56234] (2 superfamilies)
    4 layers: alpha/beta/beta/alpha; has an unusual sheet-to-sheet packing
  149. 1224355d.154: DmpA/ArgJ-like [56265] (1 superfamily)
    duplication of beta(3)-alpha-beta-alpha motif; 4 layers: alpha/beta/beta/alpha
  150. 1224407d.155: Pyruvoyl-dependent histidine and arginine decarboxylases [56270] (1 superfamily)
    duplication of beta-alpha-beta(2) motif; 4 layers: alpha/beta/beta/alpha; contains "silk" beta-sandwich
  151. 1224456d.156: S-adenosylmethionine decarboxylase [56275] (1 superfamily)
    duplication of beta-alpha-beta(4)-alpha-beta-alpha-beta(2) motif; 4 layers a/b/b/a; antiparallel beta-sheets: order 23451687
  152. 1224490d.157: Metallo-hydrolase/oxidoreductase [56280] (1 superfamily)
    duplication of beta(4)-alpha-beta-alpha motif; 4 layers a/b/b/a; mixed beta-sheets
  153. 1224837d.159: Metallo-dependent phosphatases [56299] (1 superfamily)
    4 layers: alpha/beta/beta/alpha; mixed beta sheets; contains duplication
  154. 1225125d.160: Carbon-nitrogen hydrolase [56316] (1 superfamily)
    4 layers: alpha/beta/beta/alpha; mixed beta sheets; contains duplication
  155. 1225185d.161: ADC synthase [56321] (1 superfamily)
    duplication: contains four repeats of alpha-beta(2)-beta motif arranged in a 4 layer core structure: alpha/beta/beta/alpha; orthogonally packed beta-sheets
  156. 1225248d.162: LDH C-terminal domain-like [56326] (1 superfamily)
    unusual fold, defines family
  157. 1225506d.163: DNA breaking-rejoining enzymes [56348] (1 superfamily)
    core: alpha3-beta3-alpha4; one side of beta-sheet is exposed
  158. 1225616d.164: SMAD MH1 domain [56365] (1 superfamily)
    consists of four alpha-helices and three beta-ribbons
  159. 1225633d.165: Ribosome inactivating proteins (RIP) [56370] (1 superfamily)
    contains mixed beta-sheet
  160. 1225847d.166: ADP-ribosylation [56398] (1 superfamily)
    unusual fold
  161. 1226102d.167: Peptide deformylase [56419] (1 superfamily)
    alpha-beta(5)-alpha; 3 layers: a/b/a; meander beta-sheet wraps around the C-terminal alpha-helix
  162. 1226244d.168: Succinate dehydrogenase/fumarate reductase flavoprotein, catalytic domain [56424] (1 superfamily)
    unusual fold
  163. 1226319d.169: C-type lectin-like [56435] (1 superfamily)
    unusual fold
  164. 1227027d.170: SRCR-like [56486] (2 superfamilies)
    unusual fold; disulfide-rich; core: beta-x-alpha-beta-loop-beta
  165. 1227045d.171: Fibrinogen C-terminal domain-like [56495] (1 superfamily)
    unusual fold
  166. 1227223d.172: gp120 core [56501] (1 superfamily)
    unusual fold
  167. 1227260d.173: Methionine synthase activation domain-like [56506] (1 superfamily)
    unusual fold; core: beta-alpha(2)-beta(2)-alpha(2)-beta-alpha-beta; antiparallel beta-sheet: order 12354
  168. 1227278d.174: Nitric oxide (NO) synthase oxygenase domain [56511] (1 superfamily)
    unusual fold
  169. 1227704d.175: Penicillin binding protein dimerisation domain [56518] (1 superfamily)
    unusual fold
  170. 1227731d.176: Oxidoreductase molybdopterin-binding domain [56523] (1 superfamily)
    unusual fold; contains 3 layers of beta-sheet structure and a beta-grasp like motif
  171. 1227766d.177: FAH [56528] (1 superfamily)
    unusual fold; contains 3 layers of beta-sheet structure
  172. 1227869d.178: Aromatic aminoacid monoxygenases, catalytic and oligomerization domains [56533] (1 superfamily)
    unusual fold
  173. 1227919d.179: Substrate-binding domain of HMG-CoA reductase [56541] (1 superfamily)
    unusual fold
  174. 1227971d.180: Conserved core of transcriptional regulatory protein vp16 [56547] (1 superfamily)
    unusual fold
  175. 1227977d.181: Insert subdomain of RNA polymerase alpha subunit [56552] (1 superfamily)
    unusual fold; contains a left-handed beta-alpha-beta unit
  176. 1228059d.182: Baseplate structural protein gp11 [56557] (1 superfamily)
    unusual fold; trimer
  177. 1228067d.183: Major capsid protein gp5 [56562] (1 superfamily)
    unusual fold; contains PF0899-like core, decorated with additional structure
  178. 1228099d.184: Non-globular alpha+beta subunits of globular proteins [56567] (1 superfamily)
    not a true fold
  179. 1228134d.185: LuxS/MPP-like metallohydrolase [63410] (1 superfamily)
    core: beta-alpha-beta(2)-alpha(2); 2 layers: alpha/beta
  180. 1228398d.186: gpW/XkdW-like [64209] (2 superfamilies)
    alpha-beta(2)-alpha; antiparallel hairpin
  181. 1228409d.187: Photosystem I subunit PsaD [64233] (1 superfamily)
    beta-BETA(2)-beta-alpha-beta(2); antiparallel sheet: order 2134 packed against helix and BETA-hairpin on the same side; irregular C-terminal tail
  182. 1228415d.188: Prokaryotic ribosomal protein L17 [64262] (1 superfamily)
    alpha-beta-alpha(3)-beta(2); 2 layers: alpha/beta;
  183. 1228476d.189: PX domain [64267] (1 superfamily)
    beta(3)-alpha(4); meander beta-sheet packed against array of helices; contains Pro-rich stretch
  184. 1228510d.190: Chorismate lyase-like [64287] (1 superfamily)
    duplication of alpha(2)-beta(3) motif; antiparallel beta sheet, order 123654
  185. 1228599d.192: YlxR-like [64375] (1 superfamily)
    alpha+beta fold; could have evolved from a glucocorticoid receptor-like zinc finger domain
  186. 1228605d.193: Hsp33 domain [64396] (1 superfamily)
    3 layers: beta/alpha/beta; buried helix
  187. 1228621d.194: CNF1/YfiH-like putative cysteine hydrolases [64437] (1 superfamily)
    4 layers: alpha/beta/beta/alpha; mixed beta sheets
  188. 1228654d.195: YopH tyrosine phosphatase N-terminal domain [64448] (1 superfamily)
    consists of four alpha-helices and two beta-hairpins
  189. 1228663d.196: Outer capsid protein sigma 3 [64464] (1 superfamily)
    unusual fold
  190. 1228683d.197: Protein-L-isoaspartyl O-methyltransferase, C-terminal domain [68929] (1 superfamily)
    beta-alpha-beta(4)-alpha-beta(2); 3 layers: beta/alpha/beta; buried helix
  191. 1228690d.198: Secretion chaperone-like [69634] (5 superfamilies)
    alpha-beta(3)-alpha-beta(2)-alpha; 2 layers: alpha/beta
  192. 1228832d.199: MotA C-terminal domain-like [69651] (1 superfamily)
    alpha-beta(4)-alpha-beta(2)-alpha; 2 layers: alpha/beta
  193. 1228843d.200: Integrin beta tail domain [69686] (1 superfamily)
    alpha-beta-loop-beta(3); loop across free side of beta-sheet
  194. 1228852d.201: SRP19 [69694] (1 superfamily)
    beta-alpha-beta(2)-alpha; 2 layers: alpha/beta
  195. 1228869d.202: Transcription factor NusA, N-terminal domain [69704] (1 superfamily)
    alpha-beta(3)-alpha-beta-alpha; bifurcated coiled beta-sheet
  196. 1228879d.203: DsrC, the gamma subunit of dissimilatory sulfite reductase [69720] (1 superfamily)
    beta(3)-alpha(5); meander beta-sheet packed against array of helices
  197. 1228905d.204: Ribosome binding protein Y (YfiA homologue) [69753] (1 superfamily)
    beta-alpha-beta(3)-alpha; 2 layers; mixed sheet 1234, strand 3 is antiparallel to the rest
  198. 1228922d.205: GTP cyclohydrolase I feedback regulatory protein, GFRP [69760] (1 superfamily)
    beta(2)-alpha-beta(2)-alpha-beta(2); 2 layers, alpha/beta, antiparallel beta-sheet: order 342165
  199. 1228962d.206: YggU-like [69785] (1 superfamily)
    beta(2)-loop-alpha-beta(2)-alpha; 2 layers: a/b; antiparallel sheet 1243; some similarity to the Homing endonuclease-like fold
  200. 1228972d.207: Thymidylate synthase-complementing protein Thy1 [69795] (1 superfamily)
    complex alpha+beta fold; contains antiparallel 5-stranded beta-sheet: order 12354
  201. 1229040d.208: MTH1598-like [69818] (1 superfamily)
    beta(2)-alpha-beta-alpha-beta(4); 3 layers: beta/alpha/beta; some similarity to the Hsp33 fold
  202. 1229049d.209: LCCL domain [69847] (1 superfamily)
    unusual fold
  203. 1229055d.210: Argininosuccinate synthetase, C-terminal domain [69863] (1 superfamily)
    unusual fold
  204. 1229098d.211: beta-hairpin-alpha-hairpin repeat [74651] (2 superfamilies)
    multiple repeats of beta(2)-alpha(2) motif
  205. 1229254d.212: TolA/TonB C-terminal domain [74652] (1 superfamily)
    beta(2)-alpha-beta; 2 layers, alpha/beta; left-handed beta-alpha-beta unit in non-swapped monomer
  206. 1229275d.213: VSV matrix protein [75403] (1 superfamily)
    beta-alpha(2)-beta(4)-alpha-beta(2); two layers: alpha/beta; bifurcated coiled beta-sheet: order of the first 5 strands: 23154
  207. 1229281d.214: Hypothetical protein MTH1880 [75411] (1 superfamily)
    beta-alpha-beta(2)-alpha(2); 3 layers, alpha/beta/alpha; antiparallel beta-sheet: order 123
  208. 1229288d.215: Smc hinge domain [75552] (1 superfamily)
    consists of 2 different alpha+beta subdomains; forms subdomain-swapped dimers
  209. 1229307d.216: Rotavirus NSP2 fragment, N-terminal domain [75573] (1 superfamily)
    consists of six alpha-helices and two beta-hairpins
  210. 1229317d.217: SAND domain-like [63762] (1 superfamily)
    core: three short helices packed against a barrel-like beta-sheet; some similarity to the SH3-like fold
  211. 1229335d.218: Nucleotidyltransferase [81302] (1 superfamily)
    core: alpha-beta-turn-beta-X-beta-(alpha); mixed beta-sheet, order of core strands: 123
  212. 1229641d.219: PP2C-like [81607] (1 superfamily)
    4 layers: alpha/beta/beta/alpha; antiparallel beta sheets
  213. 1229668d.220: Metal cation-transporting ATPase, ATP-binding domain N [81661] (1 superfamily)
    unusual fold; core: beta-alpha(2)-beta(3)-alpha(2)-beta(2); 6-stranded antiparallel beta-sheet, order: 165432
  214. 1229711d.221: Nuclease A inhibitor (NuiA) [82601] (1 superfamily)
    alpha-beta-alpha-beta-alpha(2)-beta(3); antiparallel beta-sheet; order: 15432
  215. 1229721d.222: YbaB-like [82606] (1 superfamily)
    core: alpha-beta(3)-alpha, 2 layers:alpha/beta, three-stranded antiparallel beta sheet, strand order 123
  216. 1229737d.223: Polo-box domain [82614] (1 superfamily)
    beta(6)-alpha; antiparallel beta-sheet, meander
  217. 1229767d.224: SufE/NifU [82648] (1 superfamily)
    alpha(2)-beta(3)-alpha(3); 2 layers alpha/beta, 3-stranded antiparallel beta-sheet; order 123
  218. 1229819d.225: Multidrug efflux transporter AcrB TolC docking domain; DN and DC subdomains [82713] (1 superfamily)
    Intertwined pseudo hexamer of an alpha+beta motif
  219. 1229836d.226: GIY-YIG endonuclease [82770] (1 superfamily)
    beta(2)-alpha(2)-beta-alpha-(beta); strand 4 is very short; 3 layers; antiparallel (mixed) beta-sheet; order 312(4)
  220. 1229844d.227: OsmC-like [82783] (1 superfamily)
    swapped dimer of beta(3)-alpha-beta(2)-alpha(2)-beta subunits; mixed beta-sheet; order: 321[4][5][6]; buried helix
  221. 1229922d.228: Replication modulator SeqA, C-terminal DNA-binding domain [82807] (1 superfamily)
    consists of seven alpha-helices and three-stranded beta-sheet
  222. 1229935d.229: MesJ substrate recognition domain-like [82828] (1 superfamily)
    beta-alpha(2)-beta(3); 2 layers: a/b; antiparallel beta-sheet, order:1432
  223. 1229953d.230: Dodecin subunit-like [88797] (6 superfamilies)
    beta-alpha-beta(2); 2 layers: alpha/beta; antiparallel beta-sheet: order 132
  224. 1230163d.231: Receptor-binding domain of short tail fibre protein gp12 [88873] (1 superfamily)
    unusual fold; trimer
  225. 1230170d.232: Mago nashi protein [89816] (1 superfamily)
    beta(4)-alpha-beta(2)-alpha; 2 layers: alpha/beta; antiparallel beta-sheet, order: 651234
  226. 1230189d.233: Inhibitor of vertebrate lysozyme, Ivy [89871] (1 superfamily)
    alpha(2)-beta(5)-alpha(2); 3 layers a/b/a; meander beta-sheet
  227. 1230202d.234: Proguanylin [89889] (1 superfamily)
    beta(2)-alpha(3)-beta; two layers: alpha/beta; antiparallel sheet: order 213
  228. 1230208d.235: FYSH domain [89894] (1 superfamily)
    beta(2)-alpha(2)-beta(2)-alpha-beta; two layers: alpha/beta; antiparallel sheet: order 51234
  229. 1230219d.236: DNA-binding protein Tfx [89914] (1 superfamily)
    alpha(3)-beta-alpha(2)-beta(2); 2 layers alpha/beta, 3-stranded antiparallel beta-sheet; order 123
  230. 1230225d.237: Hypothetical protein YjiA, C-terminal domain [90001] (1 superfamily)
    beta-alpha-beta(4)-alpha; 2 layers: a/b; antiparallel sheet 15234; topological similarity to the HPr-like fold
  231. 1230231d.238: Hypothetical protein TM0875 [90063] (1 superfamily)
    unusual fold; core: beta(2)-loop-beta(2)-alpha-beta; mixed beta-sheet: order 51243; parallel strands 2 and 4
  232. 1230237d.239: GCM domain [90072] (1 superfamily)
    consists of two different alpha+beta subdomains; 2 zinc-binding sites
  233. 1230243d.240: Lesion bypass DNA polymerase (Y-family), little finger domain [100878] (1 superfamily)
    beta-alpha-beta(2)-alpha-beta; antiparallel beta-sheet: order 1423; "reversed" ferredoxin-like topology
  234. 1230352d.241: Ribosome binding domain-like [100965] (2 superfamilies)
    beta-(2)-alpha(2)-beta(2); 2 layers: beta/alpha; antiparallel beta-sheet: order 1243; topological similarity to the common core of ribosomal proteins L23 and L15e
  235. 1230375d.242: Obg GTP-binding protein C-terminal domain [102740] (1 superfamily)
    beta-(2)-alpha(3)-beta(2); 2 layers: beta/alpha; mixed beta-sheet: order 1234; strands 2 and 3 a parallel to each other
  236. 1230381d.243: Colicin D/E5 nuclease domain [102823] (1 superfamily)
    alpha(2)-beta(4)-alpha, 2 layers: alpha/beta, antiparallel beta sheet, meander
  237. 1230404d.244: Cell division protein ZapA-like [102828] (1 superfamily)
    core: beta(2)-alpha(2), 2 layers: alpha/beta; long C-terminal helix forms dimeric parallel and tetrameric antiparallel coiled coils
  238. 1230415d.245: NSFL1 (p97 ATPase) cofactor p47, SEP domain [102847] (1 superfamily)
    beta(3)-alpha(2)-beta; 2 layers; mixed beta-sheet, order 4123, strands 1 and 4 are parallel to each other
  239. 1230423d.246: mRNA decapping enzyme DcpS N-terminal domain [102859] (1 superfamily)
    beta(3)-alpha-beta(3)-alpha; 3 layers a/b/a
  240. 1230447d.247: Chromosomal protein MC1 [102874] (1 superfamily)
    beta(2)-alpha-beta(3); 2 layers: alpha/beta
  241. 1230453d.248: Coproporphyrinogen III oxidase [102885] (1 superfamily)
    alpha-beta(6)-alpha(2)-beta-alpha(n); 3 layers alpha/beta/alpha; antiparallel sheet: order 1234567
  242. 1230487d.249: Hypothetical protein Ta1206 [102890] (1 superfamily)
    beta(4)-alpha-beta(2)-alpha(2); mixed, predominately antiparallel beta-sheet, order: 123465, strands 4 and 5 are parallel to each other
  243. 1230493d.250: Folate-binding domain [103024] (1 superfamily)
    duplication: consists of two beta(2)-alpha-beta(3)-alpha subdomains swapped with the first strands
  244. 1230523d.251: Hypothetical protein YwqG [103031] (1 superfamily)
    duplication: contains two similar beta-x-beta(4) motifs swapped with the first strands
  245. 1230529d.252: CheC-like [103038] (1 superfamily)
    duplication: tandem repeat of two intertwined alpha-beta-(X)-beta(2) motifs
  246. 1230545d.253: Hypothetical protein YoaG [103062] (1 superfamily)
    dimer of beta(2)-alpha motifs ; 2 layers, alpha/beta; reverse MinE topology
  247. 1230552d.254: Nucleocapsid protein dimerization domain [103067] (1 superfamily)
    dimer of alpha-beta(2)-alpha motifs ; 2 layers, alpha/beta
  248. 1230594d.255: Tombusvirus P19 core protein, VP19 [103144] (1 superfamily)
    beta(2)-alpha-beta(2)-alpha; 2 layers: alpha/beta; antiparallel sheet: order 2134
  249. 1230603d.256: Ta1353-like [103164] (1 superfamily)
    core: beta-alpha-beta(2)-alpha-beta-alpha-beta; 3 layers: a/b/a; antiparallel beta-sheet of 5 strands; order: 51423;
  250. 1230642d.257: Hypothetical protein TM0160 [103255] (1 superfamily)
    duplication: consists of two beta(3)-alpha(2) structural repeats; single barrel-like beta-sheet
  251. 1230651d.258: Chorismate synthase, AroC [103262] (1 superfamily)
    duplication: consists of two DCoH-like beta(2)-alpha-beta(2)-alpha structural repeats; 3 layers, beta/alpha/beta
  252. 1230698d.259: Hypothetical protein HI1480 [103276] (1 superfamily)
    beta-alpha(4)-beta-alpha-beta; segregated alpha-helical and beta-sheet subdomains; dimeric beta-sheet barrel: n=6, S=10
  253. 1230705d.260: Suppressor of Fused, N-terminal domain [103358] (1 superfamily)
    unusual fold; bifurcated beta-sheet; left-handed beta-alpha-beta unit
  254. 1230714d.261: Hypothetical protein PH1602 [103364] (1 superfamily)
    complex alpha+beta fold; contains a region of similarity to the ferredoxin-like fold
  255. 1230732d.262: NinB [103369] (1 superfamily)
    unusual fold; intertwined dimer; consists of two different structural domains
  256. 1230739d.263: Hypothetical protein Yml108w [100886] (1 superfamily)
    beta(2)-alpha-beta(2)-alpha; 2 layers, alpha/beta; mixed beta-sheet 2143, strands 1 and 4 are parallel
  257. 1230745d.264: Prim-pol domain [56746] (1 superfamily)
    consists of two alpha+beta domains
  258. 1230768d.265: Pseudouridine synthase [100877] (1 superfamily)
    consists of two alpha+beta subdomains with some similarity to the ferredoxin-like fold
  259. 1230835d.266: Hypothetical protein MTH677 [110782] (1 superfamily)
    alpha-beta(2)-alpha; 2 layers a/b; antiparallel beta-hairpin
  260. 1230841d.267: Hypothetical protein SAV1430 [110835] (1 superfamily)
    beta(3)-alpha-beta(2)-alpha; 2 layers, alpha/beta; antiparallel beta-sheet, order: 12543
  261. 1230850d.268: ParB/Sulfiredoxin [110848] (1 superfamily)
    beta*-alpha-beta(2)-alpha-beta-alpha; mixed beta sheet forms a partly open barrel: (n*=4, S*=8)
  262. 1230892d.269: Gamma-glutamyl cyclotransferase-like [110856] (1 superfamily)
    beta-alpha-beta(4)-alpha-beta(2); contains beta-sheet barrel (n=5, S=8)
  263. 1230909d.270: 2-isopropylmalate synthase LeuA, allosteric (dimerisation) domain [110920] (1 superfamily)
    duplication: consists of two beta(3)-alpha repeats; 3 layers, beta/alpha/beta
  264. 1230916d.271: HSP90 C-terminal domain [110941] (1 superfamily)
    alpha-beta(3)-alpha(3); 2 layers, a/b; mixed beta-sheet, order:132; crossing loops
  265. 1230929d.272: Dystroglycan, domain 2 [111005] (1 superfamily)
    beta-alpha-beta-X-beta(2)-alpha(2)-beta; antiparallel beta-sheet, order 24153; topological similarity to the ferredoxin-like fold (54861)
  266. 1230935d.273: YjbQ-like [111037] (1 superfamily)
    beta(2)-alpha-beta(2)-alpha(2)-beta(3); contains a beta-sandwich: 7 strands in 2 sheets; trimerizes with orthogonally packed beta-sheets
  267. 1230974d.274: Hypothetical protein PF0899 [111056] (1 superfamily)
    alpha-beta-alpha-beta(4); 2 layers: a/b; mixed beta-sheet, order 23145, strands 1 and 3 are parallel; similar to the GAPDH C-terminal domain-like fold (55346)
  268. 1230980d.275: Hut operon positive regulatory protein HutP [111063] (1 superfamily)
    alpha(2)-beta-alpha(2)-beta(3); 3 layers: a/b/a; antiparallel beta-sheet: order 1234
  269. 1231023d.276: Hypothetical protein yfbM [111068] (1 superfamily)
    beta-alpha(2)-beta-alpha(2)-beta(2)-alpha(n)-beta; 3 layers: a/b/a; antiparallel beta-sheet, order: 21543
  270. 1231030d.277: Bacillus phage protein [111073] (1 superfamily)
    alpa-beta(3)-alpha-beta(3)-alpha; 3 layers: b/a/b, 3-helical bundle flanked by two 3-stranded meander beta-sheets
  271. 1231037d.278: Ligand-binding domain in the NO signalling and Golgi transport [111125] (1 superfamily)
    an N-terminal helical bundle and the C-terminal alpha-beta(2)-alpha-beta(2) subdomain enclose a ligand-binding cavity
  272. 1231098d.279: YggX-like [111147] (1 superfamily)
    beta(2)-alpha(3); contains zinc-less 'zinc finger'-like fold (57715)
  273. 1231107d.280: Sulfolobus fructose-1,6-bisphosphatase-like [111248] (1 superfamily)
    4 layers: a/b/b/a; antiparallel beta sheets; similarities to ferredoxin-like fold (54861) in the N-terminal part (1-120) and to the Bacterial S-adenosylmethionine decarboxylase subunit (997656) in the C-terminal part (121-340)
  274. 1231113d.281: Hemolytic lectin CEL-III, C-terminal domain [111264] (1 superfamily)
    unusual fold
  275. 1231124d.282: SSo0622-like [111277] (1 superfamily)
    alpha(2)-beta(2)-alpha-beta-alpha-beta(2)-alpha; 2 layers: a/b; antiparallel beta-sheet: order 21354; strands 1,3 and 5 and the C-terminal helix are longer than other secondary structures
  276. 1231131d.283: Putative modulator of DNA gyrase, PmbA/TldD [111282] (1 superfamily)
    consists of two different alpha+beta domains; d1: [duplication of alpha-beta(3)-alpha motif; 2 layers: a/b; antiparallel beta-sheet, order: 321456; strands 1, 2, 4 and 5 are twice longer than other secondary structures]; d2 [ complex fold; contains beta-barrel (n=5, S=10)]
  277. 1231141d.284: PurS-like [109622] (1 superfamily)
    consists of two alpha+beta subdomains with some similarity to the ferredoxin-like fold
  278. 1231171d.285: DNA-binding domain of intron-encoded endonucleases [64495] (1 superfamily)
    beta(2)-alpha(2)-beta; 2 layers; 3-stranded antiparallel beta-sheet, order 213; HTH motif; also includes the extra N-terminal, DNA minor groove-binding helix
  279. 1231181d.286: TrkA C-terminal domain-like [116725] (1 superfamily)
    beta-X-beta(2)-X-beta-alpha; pseudo barrel capped by helix at one end; topological similarity to the HPr-like fold
  280. 1231208d.287: DNA methylase specificity domain [116733] (1 superfamily)
    comprises the N-terminal, double beta-helix like structure and C-terminal alpha-hairpin
  281. 1231246d.288: GTF2I-like repeat [117772] (1 superfamily)
    alpha(2)-beta-alpha-beta-alpha; 2 layers: a/b; antiparallel beta-ribbon
  282. 1231252d.289: WWE domain [117838] (1 superfamily)
    beta(2)-alpha-beta(4); antiparallel folded beta-sheet (half-barrel), order 216543
  283. 1231262d.290: AF0104/ALDC/Ptd012-like [117855] (1 superfamily)
    duplication: consists of two similar beta-alpha-beta(4) motifs
  284. 1231301d.291: YehU-like [118000] (1 superfamily)
    beta-alpha(2)-beta(2)-alpha; 3 layers, alpha/beta/alpha; antiparallel beta-sheet: order 123
  285. 1231307d.292: DNA mismatch repair protein MutL [118115] (1 superfamily)
    consists of two different alpha+beta (sub)domains; d1: [beta(3)-alpha-(insert of d2)-alpha(2)-beta; 2 layers, a/b; antiparallel sheet, order: 1234]; d2: [beta-alpha-beta(2)-alpha(2); 2 layers, a/b; antiparallel sheet, order: 132]
  286. 1231314d.293: Phosphoprotein M1, C-terminal domain [118172] (1 superfamily)
    consists of 6 helices and one beta-hairpin
  287. 1231320d.294: EndoU-like [142876] (1 superfamily)
    comprises several helices and two three-stranded antiparallel beta-sheets; similar architecture to the RNase A-like fold (54075)
  288. 1231347d.295: TFB5-like [142896] (1 superfamily)
    beta-alpha-beta(2)-alpha; 2 layers, a/b; antiparallel sheet, order: 132; dimerises in solution (PDB 2jnj) via extended N-terminal strand
  289. 1231359d.296: YktB/PF0168-like [142912] (1 superfamily)
    alpha-beta(4)-alpha-beta(2)-alpha-beta-alpha; 2 layers, a/b; antiparallel beta-sheet, order: 1234756; half-barrel shape; topological similarity to the MotA C-terminal domain-like fold (69651) and the Secretion chaperone-like fold (69634)
  290. 1231369d.297: WGR domain-like [142920] (1 superfamily)
    beta(4)-alpha-X-beta; 2 layers, a/b; antiparallel beta-sheet, order 51234; the beta-hairpin insetrion in strand 1 results in the formation of a beta-triangle structure
  291. 1231375d.298: RelE-like [143010] (1 superfamily)
    beta-alpha(2)-beta(4), 2 layers; a/b, antiparallel beta-sheet; order 15432
  292. 1231413d.299: Ns1 effector domain-like [143020] (1 superfamily)
    beta-X-beta(5)-alpha-beta-alpha; 2 layers: a/b; bifurcated beta-sheet; order 23654[1,7]
  293. 1231449d.300: Kinetochore globular domain-like [143025] (1 superfamily)
    core: alpha-beta(3)-alpha; variant: alpha-beta(4)-alpha(2)
  294. 1231461d.301: L35p-like [143033] (1 superfamily)
    core: alpha-beta(3)-alpha; 2layers a/b
  295. 1231510d.302: Coronavirus NSP8-like [143075] (1 superfamily)
    core: alpha-beta(2)-alpha-beta(4)-alpha-beta; bifurcated barrel-like beta-sheet
  296. 1231518d.303: BB1717-like [143080] (1 superfamily)
    complex fold with a bifurcated beta-sheet structure surrounded by helices; contains beta-sheet barrel, closed (n=5, S=8)
  297. 1231541d.304: TTHA1013/TTHA0281-like [143099] (1 superfamily)
    beta(3)-alpha-beta; 2 layers; mixed beta-sheet, order 4123, strands 1 and 4 are parallel to each other; topological similarity to the SEP domain fold (102847); dimerises via the long C-terminal strand with the formation of a single beta-sheet
  298. 1231556d.305: NAP-like [143112] (1 superfamily)
    core: central meander 4-stranded beta-sheet (order: 1234) transversed by a C-terminal helix
  299. 1231574d.306: YefM-like [143119] (1 superfamily)
    core: beta-alpha(2)-beta(2)-alpha; mixed beta-sheet, order:123, strands 1 and 2 are parallel; forms compact dimer with a single beta-sheet;
  300. 1231601d.307: Nqo5-like [143242] (1 superfamily)
    core: alpha-beta(2)-alpha-beta(3); 2 layers, a/b; mixed beta-sheet, order 12534, strands 2 and 5 are parallel
  301. 1231610d.308: THUMP domain [143436] (1 superfamily)
    contains mixed 8-stranded beta-sheet, folded into a half-barrel and covered with 4 helices on the outside; order 32148756; strands 5, 6 and 7 are parallel
  302. 1231629d.309: AMMECR1-like [143446] (1 superfamily)
    duplication; contains two beta(2)-alpha-beta(2) structural repeats, swapped with C-terminal strands; extra N-terminal helix and C-terminal strand
  303. 1231648d.310: VC0467-like [143455] (1 superfamily)
    complex fold; contains bifurcated beta-sheet structure folded into pseudo barrel
  304. 1231668d.311: ImmE5-like [143468] (1 superfamily)
    alpha-beta(2)-alpha-beta; 2 layers, a/b; antiparallel beta-sheet, order 213
  305. 1231675d.312: TM1622-like [143476] (1 superfamily)
    alpha-beta(3)-alpha-beta(4)-alpha; 3 layers, a/b/a; antiparallel beta-sheet, order: 1237654
  306. 1231681d.313: Antiparallel beta/alpha barrel (PT-barrel) [143491] (1 superfamily)
    tandem repeat of five alpha(2)-beta(2) motifs; antiparallel beta-sheet barrel, closed; n=10, S=10; order 123456789A; there is a channel along the barrel axis
  307. 1231694d.314: PUG domain-like [143502] (1 superfamily)
    alpha(2)-beta-alpha(2)-beta(2)-alpha; cluster of helices with a small antiparallel beta-sheet on one side; order 132; topological similarity to the fold of an extended R3H domain (PDB 1whr)
  308. 1231703d.315: TRCF domain-like [143516] (1 superfamily)
    beta-alpha(3)-beta(2)-alpha-beta(2)-alpha; 2 layers: alpha/beta; mixed beta sheet, order 12354, strands 1 and 2 are parallel; some topological similarity to the DCoH-like fold (55247)
  309. 1231710d.316: MK0786-like [143559] (1 superfamily)
    alpha(2)-beta(4); 2 layers: a/b; antiparallel beta-sheet, order 1234 (meander)
  310. 1231734d.317: YkuJ-like [143566] (1 superfamily)
    alpha-beta(4)-alpha; 2 layers a/b; antiparallel beta-sheet, order 1234
  311. 1231741d.318: SARS receptor-binding domain-like [143586] (1 superfamily)
    core: 3 layers, a/b/a; antiparallel beta-sheet of 5 strands, order 13542
  312. 1231757d.319: TTHA1528-like [143591] (1 superfamily)
    beta-alpha-beta(3)-alpha-beta-alpha(2)-beta; 3 layers: a/b/a; mixed beta-sheet, order: 143256, parallel strands' pairs are 1-4 and 2-5
  313. 1231766d.320: YojJ-like [143596] (1 superfamily)
    alpha-beta-X-beta-alpha-beta(2)-alpha-beta(3); 3 layers: a/b/a; 7-stranded mixed beta-sheet, order 2431567; strands 1 and 3 are parallel to each other
  314. 1231774d.321: STIV B116-like [143601] (1 superfamily)
    subunit fold consists of mixed 5-stranded beta-sheet, order:31452, strand 5 is antiparallel to the rest, with 3 helices on one side; dimerises with the formation of a single 10-stranded beta-sheet; strand 2 is in the dimer interface
  315. 1231794d.322: PHP14-like [143723] (1 superfamily)
    beta(3)-alpha-beta(2)-alpha-beta; 3 layers, a/b/a; mixed beta-sheet, half-barrel, order: 132456; strands 2 and 5 are antiparallel to the rest
  316. 1231816d.323: Phage tail protein-like [143748] (1 superfamily)
    alpha-beta-X-beta(2)-alpha-beta(2); 2 layers: a/b; mixed beta-sheet: order 12354, strands 1 and 2 are parallel
  317. 1231855d.324: DUSP-like [143790] (1 superfamily)
    alpha-beta-alpha-X-beta-alpha-beta; three-helical bundle capped at one end by antiparallel beta-sheet, order: 213
  318. 1231865d.325: L28p-like [143799] (1 superfamily)
    unusual fold consisting of three beta-hairpins, that form a paper clip-like structure, and two helices; could have evolved from a glucocorticoid receptor-like zinc finger domain (57715)
  319. 1231919d.326: XisI-like [143846] (1 superfamily)
    alpha-beta(4)-alpha-beta-alpha; 2 layers, a/b; antiparallel beta-sheet, order 1234, meander; the open side of beta-sheet provides dimerization interface
  320. 1231938d.327: DeoB insert domain-like [143855] (1 superfamily)
    alpha-beta-X-beta(2)-alpha-beta(2); 2 layers, a/b; mixed beta-sheet of 5 strands, order 12345; strands 2 and 5 are antiparallel to the rest
  321. 1231945d.328: CorA soluble domain-like [143864] (1 superfamily)
    beta(2)-alpha-beta-alpha(2)-beta(4)-alpha(3); 3 layers: a/b/a; mixed beta-sheet, order 2137654; strands 3 and 7 are parallel
  322. 1231971d.329: PF0523-like [143869] (1 superfamily)
    beta-alpha-beta-alpha(3)-beta-alpha-beta-alpha; 3 layers, a/b/a; antiparallel beta-sheet, order 4132; some similarity to the PurM C-terminal domain-like fold (56041)
  323. 1231977d.330: ERH-like [143874] (1 superfamily)
    beta(2)-alpha(2)-beta(2)-alpha; antiparallel beta-sheet, order:2134; helices are arranged in a bundle rather than packed agains beta-sheet; dimerises via with the formation of a flattened beta-barel: closed n=8, S=10
  324. 1231991d.331: NE0471 N-terminal domain-like [143879] (1 superfamily)
    beta(3)-alpha(n)-beta(3)-alpha; the two meander beta-sheets and helices are packed against the same core
  325. 1231998d.332: RGC domain-like [143884] (1 superfamily)
    consists of two beta-sheets and four helices eclosing a cental cavity
  326. 1232004d.333: UbiD C-terminal domain-like [143967] (1 superfamily)
    alpha-beta(2)-alpha-beta-alpha-beta(2); 3 layers, a/b/a; mixed beta-sheet, order: 12354, strands 2,3 and 5 are parallel to each other
  327. 1232012d.334: IlvD/EDD N-terminal domain-like [143974] (1 superfamily)
    contains a large cluster of helices and a mixed beta-sheet of 4 strands; order 2134, strands 3 and 4 are parallel
  328. 1232019d.335: L,D-transpeptidase pre-catalytic domain-like [143984] (1 superfamily)
    unusual fold, made of four helices and four 2-3 stranded beta-sheets
  329. 1232025d.336: YbiA-like [143989] (1 superfamily)
    consists of six alpha-helices and two two-stranded beta-sheets
  330. 1232031d.337: AF2331-like [143994] (1 superfamily)
    interlocked dimer of beta-alpha-beta(2)-alpha-beta-(alpha) subunits; 3 layers: b/b/a
  331. 1232038d.338: Oxysterol-binding protein-like [143999] (1 superfamily)
    core: large meander beta-sheet of 12 strands wrapped around the N-terminal (distorted) alpha-hairpin; some similarity to transmembrane beta-barrel proteins
  332. 1232057d.339: ORC1-binding domain [144004] (1 superfamily)
    complex fold, composed of an alpha hairpin, meander beta-sheet and a five-stranded barrel of unusual topology
  333. 1232066d.340: CofE-like [144009] (1 superfamily)
    consists of two different domains; d1: beta-alpha-beta-alpha-beta(2)-alpha-beta, mixed sheet of 5 strands, order:15234, strands 2 and 3 are parralel; d2 is inserted in d1 after strand 2 and comprises a helix-turn-helix motif and two 3-stranded sheets
  334. 1232075d.341: Peptidoglycan deacetylase N-terminal noncatalytic region [144014] (1 superfamily)
    consists of two different domains, d1: [alpha-beta(2)-alpha-beta(3); 3 layers: a/b/a; mixed beta-sheet, order 12345, strands 2 and 3 are parallel to each other with a left-handed crossover connection], d2: alpha-beta(3)-alpha; 2 layers; antiparallel beta-sheet, order 123]
  335. 1232082d.342: PH1570-like [159901] (1 superfamily)
    duplication: two beta(4)-alpha structural repeats, related by pseudo twofold symmetry; two extra helices in the linker region; single 8-standed antiparallel beta-sheet, order: 12348765
  336. 1232091d.343: MM3350-like [159940] (1 superfamily)
    beta(2)-alpha-beta(4); antiparallel beta-sheet; order: 216534; similar to a ubiquitin-like fold with the extra C-terminal strand inserted in the middle of the beta-sheet
  337. 1232098d.344: GINS/PriA/YqbF domain [160058] (1 superfamily)
    beta(4)-alpha-beta; 3-stranded antiparallel beta-sheet (strands 4,1 and 5) are covered on the same side by the helix and beta hairpin of strands 2 and 3; similarity to the L9 N-domain-like fold (55657) and the PsaD fold (64243)
  338. 1232134d.345: NRDP1 C-terminal domain-like [160087] (1 superfamily)
    alpha-beta-alpha(3)-beta(3); a pseudo barrel beta-sheet of an SH3-like topology, surrounded by helices
  339. 1232145d.346: SARS Nsp1-like [160098] (1 superfamily)
    complex alpha+beta fold; contains mixed beta-sheet barrel, n=6, S=10
  340. 1232152d.347: Acetoacetate decarboxylase-like [160103] (1 superfamily)
    complex fold: contains a 3-layer beta-sheet structure, which is folded in two conjoint barrels capped by helices; one rounded barrel has 7 strands, the other flattened barrel has 9 strands
  341. 1232180d.348: YegP-like [160112] (1 superfamily)
    comprises two subunits or tandem repeats of beta(3)-alpha-beta motifs; these assemble with the formation of a single beta-sheet and swapping of the C-terminal strands
  342. 1232205d.349: CPE0013-like [160147] (1 superfamily)
    beta(2)-alpha-beta(3); mixed, mostly antiparallel beta-sheet, folded in a half-barrel; order:31254; strand 3 is parallel to strand 1 and is shorter than the rest
  343. 1232211d.350: YcgL-like [160190] (1 superfamily)
    beta(2)-alpha-beta-alpha-beta; 3 layers: a/b/a; antiparallel beta-sheet, order:3124
  344. 1232217d.351: NMB0488-like [160206] (1 superfamily)
    duplication: two beta(3)-alpha motifs are related by pseudo twofold symmetry; single antiparrallel beta-sheet, order:321456, shaped into a half-barrel; helical linker region
  345. 1232227d.352: FlaG-like [160213] (1 superfamily)
    alpha(2)-beta(3)-alpha; 2 layers: a/b; antiparallel beta-sheet, order: 123; partial similatity to the dsRBD-like fold(sop_cf 54767)
  346. 1232233d.353: AMPKBI-like [160218] (1 superfamily)
    comprises 3 short helices and 3-stranded meander beta-sheet; makes extensive intermolecular interactions
  347. 1232265d.354: Shew3726-like [160271] (1 superfamily)
    beta(3)-alpha(n)-beta; 2 layers, a/b; mixed beta-sheet, order 1234, strands 3 and 4 are parallel with a left-handed crossover connection
  348. 1232271d.355: RplX-like [160373] (1 superfamily)
    beta(2)-alpha-beta-alpha; 3 layers, a/b/a; antiparallel beta-sheet, order: 213; some structural similarity to the PurS subunit/repeat (109622)
  349. 1232277d.356: SP0830-like [160378] (1 superfamily)
    duplication: two beta-alpha-beta(2)-alpha-beta-alpha motifs are organized in ferredoxin-like subdomains swapped with the extra C-terminal helices
  350. 1232286d.357: NosL/MerB-like [160386] (1 superfamily)
    unusual fold; comprises two structural repeats of beta(2)-alpha-beta motifs, forming separate beta-sheets; probable duplication
  351. 1232297d.358: YdfO-like [160418] (1 superfamily)
    duplication: two alpha(2)-beta(3) motifs are related by pseudo twofold symmetry; single antiparrallel beta-sheet, order:321456
  352. 1232303d.359: BH3703-like [160423] (1 superfamily)
    alpha-beta(3)-alpha-beta(2)-alpha(2); antiparallel beta-sheet, order:32145; duplication: two alpha-beta(2) structural repeats are arranged with pseudo twofold symmetry
  353. 1232312d.360: PG1857-like [160447] (1 superfamily)
    alpha-beta-alpha-beta(2)-alpha(3); 3 layers, a/b/a; antiparallel beta-sheet, order: 132
  354. 1232319d.361: PB2 C-terminal domain-like [160452] (1 superfamily)
    alpha-beta-alpha-X-alpha-beta(2); 3 layers, a/b/a; antiparallel beta-sheet, order 132; connection between helices 2 and 3 runs over the edge of the beta-sheet
  355. 1232329d.362: BLRF2-like [160458] (1 superfamily)
    homodimer of alpha(2)-beta motif; also includes extra N-terminal helix of variable position
  356. 1232340d.363: NMB0513-like [160471] (1 superfamily)
    alpha(3)-beta(2)-alpha-beta(2); some similarity to the "winged helix" DNA-binding domain fold
  357. 1232347d.364: PA1123-like [160476] (1 superfamily)
    irregular array of short helices and two three-stranded beta-sheets
  358. 1232353d.365: Ava3019-like [160531] (1 superfamily)
    alpha(2)-beta-alpha-beta(4); 2 layers, a/b; antiparallel beta-sheet, order: 32145; similarity to the insert domain of Glucose 6-phosphate dehydrogenase-like family (sop_fa 55376)
  359. 1232361d.366: SpoVG-like [160536] (1 superfamily)
    beta(5)-alpha; comprises a coiled antiparallel beta-sheet (order: 12345) packed against the C-terminal helix; the extensions of strands 4 and 5 form an isolated beta-hairpin
  360. 1232377d.367: EscU C-terminal domain-like [160543] (1 superfamily)
    alpha-beta(3)-alpha-beta-alpha(2); 3 layers, a/b/a; mixed beta-sheet, order: 4123, strand 2 is antiparallel to the rest
  361. 1232402d.368: YonK-like [160569] (1 superfamily)
    intertwined dimer of beta(3)-alpha-beta subunits; assembles further in octamer with formation of a wide 16-stranded beta-barrel
  362. 1232411d.369: SMI1/KNR4-like [160630] (1 superfamily)
    alpha(4)-beta(4)-alpha; 3 layers: a/b/a; antiparallel beta-sheet, order 1234(meander)
  363. 1232424d.370: BTG domain-like [160695] (1 superfamily)
    alpha(2)-beta-alpha(2)-beta(3); four-helical bundle, capped at one end by an antiparallel beta-sheet, order:1234
  364. 1232442d.371: YehR-like [160703] (1 superfamily)
    beta(3)-alpha-beta(2)-alpha(3)-beta; 2 layers, a/b; antiparallel beta-sheet, order: 612354
  365. 1232448d.372: YqaI-like [160712] (1 superfamily)
    dimeric zinc-less 'zinc finger'-like fold; similar to the C-terminal strand-swapped B-box domain (57844)
  366. 1232455d.373: gpW/gp25-like [160718] (1 superfamily)
    alpha(2)-beta(3); similar to one structural repeat of the Creatinase/aminopeptidase family and the C-terminal subdomain of PanC
  367. 1232461d.374: TTHC002-like [160760] (1 superfamily)
    alpha-beta-alpha-beta(3); forms dimer with a single beta-sheet, folded in a barrel-like shape
  368. 1232468d.375: NE1680-like [160765] (1 superfamily)
    beta(2)-alpha-beta-alpha-beta; 2 layers, a/b; antiparallel sheet, order 3124
  369. 1232474d.376: Lp2179-like [160799] (1 superfamily)
    beta(2)-alpha-beta(4)-alpha-beta; contains two antiparallel beta-sheets (orders: 127 and 3456) packed against the longer C-terminal helix
  370. 1232480d.377: Rv2827c C-terminal domain-like [160886] (1 superfamily)
    multihelical array flanked by two three-stranded mixed beta-sheets
  371. 1232487d.378: Phosphoprotein oligomerization domain-like [160891] (1 superfamily)
    intertwinned homodimer of beta(2)-alpha-beta(2) motifs; 3 layers: b/a/b; each antiparallel beta-sheet is formed by the N-terminal beta-hairpin of one subunit and the C-terminal beta-hairpin of the other subunit; order 1243
  372. 1232498d.379: Taf5 N-terminal domain-like [160896] (1 superfamily)
    multihelical cluster with a C-terminal beta-alpha(2)-beta motif; one central buried helix; parallel beta-ribbon
  373. 1232521d.380: Jann2411-like [160903] (1 superfamily)
    unusual fold; consists of seven alpha-helices and three beta-hairpins
  374. 1232527d.381: ATP12-like [160908] (1 superfamily)
    contains an N-terminal beta-sheet that forms a beta-triangle structure; the remainder is a multihelical array of long and short helices
  375. 1232541d.382: PSTPO5379-like [160919] (1 superfamily)
    complex fold; consists of two alpha+beta subdomains, one is inserted in the other
  376. 1232551d.383: PG1388-like [160924] (1 superfamily)
    consists of 2 alpha+beta subdomains, each having a meander beta-sheet; d1: alpha(2)-beta(7); d2: alpha(2)-beta(2)-alpha(2)-beta(2)

More info for Class d: Alpha and beta proteins (a+b)

Timeline for Class d: Alpha and beta proteins (a+b):