Annotations: 1SMT

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1smta_	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)
B	d1smtb_	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)
A	SCOP2B Superfamily	Winged helix DNA-binding domain	8057960	3000034	SCOP2B (2022-06-29)
B	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)
A	HTH_5_1	e1smtA1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: HTH_5_1	ECOD (1.6)
B	HTH_5_1	e1smtB1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: HTH_5_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
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)
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)

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 organic cyclic compound 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	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 National Science Foundation (DBI-1832184), 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 R01GM133198.