Annotations: 1IRQ

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1irqa_	All alpha proteins	Ribbon-helix-helix	Ribbon-helix-helix	Omega transcriptional repressor	Omega transcriptional repressor	(Streptococcus pyogenes ) [TaxId: 1314 ],	SCOPe (2.08)
B	d1irqb_	All alpha proteins	Ribbon-helix-helix	Ribbon-helix-helix	Omega transcriptional repressor	Omega transcriptional repressor	(Streptococcus pyogenes ) [TaxId: 1314 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Omega transcriptional repressor	8024343	4000609	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Ribbon-helix-helix	8036722	3000295	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Ribbon-helix-helix	8036722	3000295	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	PF07764	e1irqA1	A: alpha arrays	X: HTH	H: HTH	T: Ribbon-helix-helix	F: PF07764	ECOD (1.6)
B	PF07764	e1irqB1	A: alpha arrays	X: HTH	H: HTH	T: Ribbon-helix-helix	F: PF07764	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.1220.10	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant	Met repressor-like	CATH (4.3.0)
B	1.10.1220.10	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant	Met repressor-like	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF07764	Omega Transcriptional Repressor (Omega_Repress)	Omega Transcriptional Repressor	The omega transcriptional repressor regulates expression of involved in copy number control and stable maintenance of plasmids. The omega protein belongs to the structural superfamily of MetJ/Arc repressors featuring a ribbon-helix-helix DNA-binding ...	The omega transcriptional repressor regulates expression of involved in copy number control and stable maintenance of plasmids. The omega protein belongs to the structural superfamily of MetJ/Arc repressors featuring a ribbon-helix-helix DNA-binding motif with the beta-ribbon located in and recognising the major groove of operator DNA [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	omega transcriptional repressor	-	regulation of cellular process cellular biosynthetic process RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process organic substance metabolic process organic substance biosynthetic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of cellular process cellular biosynthetic process RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process organic substance metabolic process organic substance biosynthetic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process cellular metabolic process biological regulation primary metabolic process regulation of cellular metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of cellular biosynthetic process organic cyclic compound metabolic process regulation of gene expression biosynthetic process organic cyclic compound biosynthetic process metabolic process regulation of macromolecule biosynthetic process cellular process regulation of DNA-templated transcription macromolecule metabolic process regulation of metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR013321	Arc-type ribbon-helix-helix	Homologous Superfamily
A, B	IPR010985	Ribbon-helix-helix	Homologous Superfamily
A, B	IPR011686	Omega transcriptional repressor	Domain

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 R01GM133198.