1R23 | pdb_00001r23

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

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d1r23b_	All alpha proteins	DNA/RNA-binding 3-helical bundle	'Winged helix' DNA-binding domain	ArsR-like transcriptional regulators	SmtB repressor	(Synechococcus elongatus PCC 7942 = FACHB-805 ) [TaxId: 1140 ],	SCOPe (2.08)
A	d1r23a_	All alpha proteins	DNA/RNA-binding 3-helical bundle	'Winged helix' DNA-binding domain	ArsR-like transcriptional regulators	SmtB repressor	(Synechococcus elongatus PCC 7942 = FACHB-805 ) [TaxId: 1140 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Winged helix DNA-binding domain	8057960	3000034	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Winged helix DNA-binding domain	8057960	3000034	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Fe_dep_repress	e1r23B1	A: alpha bundles	X: EGF-like	H: YozE-like	T: Ribbon-helix-helix	F: Fe_dep_repress	ECOD (develop294)
A	Fe_dep_repress	e1r23A1	A: alpha bundles	X: EGF-like	H: YozE-like	T: Ribbon-helix-helix	F: Fe_dep_repress	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.10.10	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain	CATH (4.3.0)
A	1.10.10.10	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01022	Bacterial regulatory protein, arsR family (HTH_5)	Bacterial regulatory protein, arsR family	Members of this family contains a DNA binding 'helix-turn-helix' motif. This family includes other proteins which are not included in the Prosite definition.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Transcriptional repressor smtB	DNA binding binding nucleic acid binding transcription regulator activity DNA-binding transcription factor activity cation binding ion binding metal ion binding small molecule binding	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR001845	HTH ArsR-type DNA-binding domain	Domain
A, B	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
A, B	IPR011991	ArsR-like helix-turn-helix domain	Domain
A, B	IPR051011	Metal-responsive transcriptional regulator	Family
A, B	IPR036390	Winged helix DNA-binding domain superfamily	Homologous Superfamily
A, B	IPR018334	ArsR-type transcription regulator, HTH motif	Conserved Site

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.