SCOPe 2.05: Domain d1r23b_: 1r23 B:

Lineage for d1r23b_ (1r23 B:)

1. Root: SCOPe 2.05

2. Class a: All alpha proteins [46456] (286 folds)

3. Fold a.4: DNA/RNA-binding 3-helical bundle [46688] (14 superfamilies)
   core: 3-helices; bundle, closed or partly opened, right-handed twist; up-and down

4. Superfamily a.4.5: "Winged helix" DNA-binding domain [46785] (85 families)
   contains a small beta-sheet (wing)

5. Family a.4.5.5: ArsR-like transcriptional regulators [46801] (5 proteins)
   The N- and C-terminal helical extensions to the common fold form the dimer interface

6. Protein SmtB repressor [46802] (1 species)

7. Species Cyanobacteria (Synechococcus), pcc7942 [TaxId:1129] [46803] (4 PDB entries)
   Uniprot P30340

8. Domain d1r23b_: 1r23 B: [104780]
   complexed with zn

Details for d1r23b_

PDB Entry: 1r23, 2 Å

PDB Description: Crystal structure of the cyanobacterial metallothionein repressor SmtB in the Zn1-form (one Zn(II) per dimer)

PDB Compounds: (B:) Transcriptional repressor smtB

SCOPe Domain Sequences for d1r23b_:

Sequence; same for both SEQRES and ATOM records:

>d1r23b_ a.4.5.5 (B:) SmtB repressor {Cyanobacteria (Synechococcus), pcc7942 [TaxId: 1129]}
lqaiapevaqslaeffavladpnrlrllsllarselcvgdlaqaigvsesavshqlrslr
nlrlvsyrkqgrhvyyqlqdhhivalyqnaldhlqec

Timeline for d1r23b_:

• d1r23b_ first appeared in SCOP 1.69
  
• d1r23b_ appears in SCOPe 2.04
  
• d1r23b_ appears in SCOPe 2.06
  
• d1r23b_ appears in the current release, SCOPe 2.08