Annotations: 4CHU

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Rrf2	e4chuA1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Rrf2	ECOD (1.6)
B	Rrf2	e4chuB1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Rrf2	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	PF02082	Iron-dependent Transcriptional regulator (Rrf2)	Iron-dependent Transcriptional regulator	Several proteins in this family form iron-sulfur clusters enabling iron dependent DNA transcription regulation [1]. The iron binding is mediated by three conserved cysteine residues. Members of this family can also bind O-acetyl-L-serine, [Fe-S] and ...	Several proteins in this family form iron-sulfur clusters enabling iron dependent DNA transcription regulation [1]. The iron binding is mediated by three conserved cysteine residues. Members of this family can also bind O-acetyl-L-serine, [Fe-S] and nitric oxide (Matilla et. al., FEMS Microbiology Reviews, fuab043, 45, 2021, 1. https://doi.org/10.1093/femsre/fuab043).	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	HTH-TYPE TRANSCRIPTIONAL REGULATOR ISCR	DNA binding double-stranded DNA binding binding organic cyclic compound binding nucleic acid binding iron-sulfur cluster binding 2 iron, 2 sulfur cluster binding metal cluster binding small molecule binding transcription regulator activity DNA-binding transcription factor activity cation binding transition metal ion binding iron ion binding DNA binding double-stranded DNA binding binding organic cyclic compound binding nucleic acid binding iron-sulfur cluster binding 2 iron, 2 sulfur cluster binding metal cluster binding small molecule binding transcription regulator activity DNA-binding transcription factor activity cation binding transition metal ion binding iron ion binding ion binding metal ion binding	-	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol
C	HYA PROMOTER FRAGMENT	-	-	-
D	HYA PROMOTER FRAGMENT	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR010242	Transcription factor HTH, IscR	Family
A, B	IPR030489	Transcription regulator Rrf2-type, conserved site	Conserved Site
A, B	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
A, B	IPR000944	Transcription regulator Rrf2	Family
A, B	IPR036390	Winged helix DNA-binding domain superfamily	Homologous Superfamily

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.