Folds:

1. f.1: Toxins' membrane translocation domains [56836] (5 superfamilies) multi-helical domains of various folds which is thought to unfold in the membrane

2. f.3: Light-harvesting complex subunits [56917] (1 superfamily) membrane all-alpha fold

3. f.4: Transmembrane beta-barrels [56924] (4 superfamilies) not a true fold, gathers together transmembrane barrels of different (n,S)

4. f.5: Integral outer membrane protein TolC, efflux pump component [56953] (1 superfamily) subunit fold contains tandem repeat of alpha-beta hairpin-alpha(2) motif trimeric fold contains barrel (n=12, S=18) formed by beta-hairins, two from each subunit, and a bundle of helices with a channel running through it

5. f.6: Leukocidin (pore-forming toxin) [56958] (1 superfamily) subunit fold contains beta-sandwich of Ig-like (grek-key) topology heptameric fold contains barrel (n=14, S=14) formed by beta-ribbon arms, one from each subunit

6. f.7: Lipovitellin-phosvitin complex; beta-sheet shell regions [56967] (1 superfamily) contains several large open beta-sheets

7. f.8: (Pro)aerolysin, pore-forming lobe [56972] (1 superfamily) 3 domains: (1) alpha+beta; (2&3) all-beta

8. f.9: Perfringolysin [56977] (1 superfamily) 2 domains: (1) alpha+beta; (2) all-beta, similar to the CalB domain fold but the two last strands are transposed

9. f.10: Viral glycoprotein, central and dimerisation domains [56982] (1 superfamily) 2 intertwined domains; all-beta and alpha+beta

10. f.11: Anthrax protective antigen [56987] (1 superfamily) 4 domains; I (res. 14-225) and II (226-487) are beta-sandwiches of similar gamma-crystallin like topologies; III (488-594) has a beta-grasp like fold; IV (595-735) has an Ig-like fold

11. f.12: Head and neck region of the ectodomain of NDV fusion glycoprotein [69921] (1 superfamily) 3 intertwined all-beta domains

12. f.13: Family A G protein-coupled receptor-like [81322] (1 superfamily) core: up-and-down bundle of seven transmembrane helices tilted 20 degrees with respect to the plane of the membrane

13. f.14: Voltage-gated potassium channels [81325] (1 superfamily) oligomeric transmembrane alpha-helical proteins

14. f.15: Small-conductance potassium channel [81328] (1 superfamily) oligomeric transmembrane alpha-helical protein

15. f.16: Gated mechanosensitive channel [81331] (1 superfamily) oligomeric transmembrane alpha-helical protein

16. f.17: Transmembrane helix hairpin [81334] (2 superfamilies) two antiparallel transmembrane helices

17. f.18: F1F0 ATP synthase subunit A [81337] (1 superfamily) core: up-and-down bundle of four transmembrane helices

18. f.19: Aquaporin-like [81339] (1 superfamily) core: 8 helices, 2 short helices are surrounded by 6 long transmembrane helices

19. f.20: Clc chloride channel [81341] (1 superfamily) core: 18 transmembrane helices

20. f.21: Heme-binding four-helical bundle [81344] (2 superfamilies) core: four transmembrane helices, up-and-down bundle, binds one or two heme groups in between the helices

21. f.22: ABC transporter involved in vitamin B12 uptake, BtuC [81346] (1 superfamily) multihelical; complex architecture with several transmembrane helices

22. f.23: Single transmembrane helix [81407] (22 superfamilies) not a true fold

23. f.24: Cytochrome c oxidase subunit I-like [81443] (1 superfamily) 12 transmembrane helices in an approximate threefold rotational symmetric arrangement

24. f.25: Cytochrome c oxidase subunit III-like [81453] (1 superfamily) core: 7 transmembrane helices organised into two bundles, one formed by the first two helices and the other by the rest

25. f.26: Bacterial photosystem II reaction centre, L and M subunits [81484] (1 superfamily) five transmembrane helices forming a sheet-like structure

26. f.27: 14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81525] (1 superfamily) membrane-associated alpha-helical protein; no transmembrane helices

27. f.28: Nonheme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81532] (1 superfamily) membrane-associated alpha-helical protein; no transmembrane helices

28. f.29: Photosystem I subunits PsaA/PsaB [81559] (1 superfamily) core:11 transmembrane helices

29. f.30: Photosystem I reaction center subunit X, PsaK [81564] (1 superfamily) core: hairpin of two transmembrane helices

30. f.31: Photosystem I reaction center subunit XI, PsaL [81569] (1 superfamily) core: three transmembrane helices, bundle

31. f.32: a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81649] (1 superfamily) core: three transmembrane helices, up-and-down bundle

32. f.33: Calcium ATPase, transmembrane domain M [81666] (1 superfamily) core: multihelical; consists of three transmembrane regions of 2, 2 and 6 helices, separated by cytoplasmic domains

33. f.34: Mechanosensitive channel protein MscS (YggB), transmembrane region [82860] (1 superfamily) oligomeric fold; 3 transmembrane helices per subunit

34. f.35: Multidrug efflux transporter AcrB transmembrane domain [82865] (1 superfamily) 12 transmembrane helices; duplication: the N- and C-terminal halves of the whole proteins are structurally similar

35. f.36: Neurotransmitter-gated ion-channel pransmembrane pore [90111] (1 superfamily) hetropentameric transmembrane alpha-helical protein; 4 transmembrane helices per subunit

36. f.37: Multidrug resistance ABC transporter MsbA, N-terminal domain [90122] (1 superfamily) multihelical; complex architecture with several transmembrane helices

More info for Class f: Membrane and cell surface proteins and peptides

Timeline for Class f: Membrane and cell surface proteins and peptides:

• Class f: Membrane and cell surface proteins and peptides first appeared (with stable ids) in SCOP 1.55
  
• Class f: Membrane and cell surface proteins and peptides appears in SCOP 1.63
  
• Class f: Membrane and cell surface proteins and peptides appears in SCOP 1.67
  
• Class f: Membrane and cell surface proteins and peptides appears in the current release, SCOPe 2.08