Annotations: 3T0Y

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Sigma70_r4_2_1	e3t0yA2	A: alpha arrays	X: HTH	H: HTH	T: tri-helical	F: Sigma70_r4_2_1	ECOD (1.6)
A	PRK09191	e3t0yA1	A: alpha complex topology	X: Sigma2 domain-like	H: Sigma2 domain of RNA polymerase sigma factors (From Topology)	T: Sigma2 domain of RNA polymerase sigma factors	F: PRK09191	ECOD (1.6)
C	Sigma70_r4_2_1	e3t0yC6	A: alpha arrays	X: HTH	H: HTH	T: tri-helical	F: Sigma70_r4_2_1	ECOD (1.6)
C	PRK09191	e3t0yC5	A: alpha complex topology	X: Sigma2 domain-like	H: Sigma2 domain of RNA polymerase sigma factors (From Topology)	T: Sigma2 domain of RNA polymerase sigma factors	F: PRK09191	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.1740.10	Mainly Alpha	Orthogonal Bundle	Rna Polymerase Sigma Factor	Chain: A	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)
C	1.20.140.160	Mainly Alpha	Up-down Bundle	Butyryl-CoA Dehydrogenase, subunit A	domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C	PF22233	Response regulator PhyR, sigma-like domain (PhyR_sigma-like)	Response regulator PhyR, sigma-like domain	PhyR is a signal transduction response regulator found in Alphaproteobacteria with a C-terminal receiver domain (Pfam:PF00072) and extracytoplasmic function (ECF) sigma factor-like domain at the N-terminal which is represented in this entry [1-3]. Ph ...	PhyR is a signal transduction response regulator found in Alphaproteobacteria with a C-terminal receiver domain (Pfam:PF00072) and extracytoplasmic function (ECF) sigma factor-like domain at the N-terminal which is represented in this entry [1-3]. PhyR is the regulator of the two-component signal transduction system which controls transcription in response to general stress.	Domain
A, C	PF22029	Sigma2 domain of PhyR (PhyR_sigma2)	Sigma2 domain of PhyR	This is the N-terminal domain of response regulator PhyR and related proteins. It consists of three alpha-helices and together with sigma4 constitutes the PhyR sigma-like (SL) domain. This domain was shown to bind to anti-sigma factor NepR [1].	Domain
B, D	PF18557	Anti-sigma factor NepR (NepR)	Anti-sigma factor NepR	The general stress response sigma factor in alphaproteobacteria, sigma EcfG is inactivated by the anti-sigma factor NepR, which is itself regulated by the response regulator PhyR. NepR forms two helices that extend over the surface of the PhyR subdom ...	The general stress response sigma factor in alphaproteobacteria, sigma EcfG is inactivated by the anti-sigma factor NepR, which is itself regulated by the response regulator PhyR. NepR forms two helices that extend over the surface of the PhyR subdomains. Homology modeling and comparative analysis of NepR, PhyR and sigmaEcfG mutants indicate that NepR contacts both proteins with the same determinants, showing sigma factor mimicry at the atomic level. This entry represents NepR domains found in alphaproteobacteria [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C	Response regulator	-	cellular response to stimulus regulation of biological process phosphorelay signal transduction system regulation of cellular process response to stimulus signaling biological regulation intracellular signal transduction cell communication cellular process signal transduction	-
B, D	NepR	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, C	IPR014605	Signal transduction response regulator PhyR-like, alphaproteobacteria	Family
A, C	IPR011006	CheY-like superfamily	Homologous Superfamily
A, C	IPR001789	Signal transduction response regulator, receiver domain	Domain
A, C	IPR050595	Bacterial response regulator	Family
A, C	IPR053867	PhyR, sigma4 domain	Domain
A, C	IPR013324	RNA polymerase sigma factor, region 3/4-like	Homologous Superfamily
A, C	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
A, C	IPR053866	PhyR, sigma2 domain	Domain
B, D	IPR041649	Anti-sigma factor NepR	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 R01GM157729.