4NQW

Structure of Mycobacterium tuberculosis extracytoplasmic function sigma factor SigK in complex with the cytosolic domain of its cognate anti-sigma factor RskA

External Resource: Annotation

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: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2 Family	Cytosolic domain of RskA	8051518	4007413	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	N-terminal cytoplasmic domain of anti-sigmaE factor RseA-like	8105345	3001438	SCOP2 (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	PF04545	e4nqwA1	A: alpha arrays	X: HTH	H: HTH	T: tri-helical	F: PF04545	ECOD (1.6)
A	PF04542	e4nqwA2	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: PF04542	ECOD (1.6)
B	PF22618	e4nqwB1	A: alpha arrays	X: N-terminal, cytoplasmic domain of anti-sigma factors (From Topology)	H: N-terminal, cytoplasmic domain of anti-sigma factors (From Topology)	T: N-terminal, cytoplasmic domain of anti-sigma factors	F: PF22618	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)
B	1.10.10.1320	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Anti-sigma factor, zinc-finger domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF04545	Sigma-70, region 4 (Sigma70_r4)	Sigma-70, region 4	Region 4 of sigma-70 like sigma-factors are involved in binding to the -35 promoter element via a helix-turn-helix motif [1]. Due to the way Pfam works, the threshold has been set artificially high to prevent overlaps with other helix-turn-helix fami ...	Region 4 of sigma-70 like sigma-factors are involved in binding to the -35 promoter element via a helix-turn-helix motif [1]. Due to the way Pfam works, the threshold has been set artificially high to prevent overlaps with other helix-turn-helix families. Therefore there are many false negatives.	Domain
B	PF10099	Anti-sigma-K factor rskA (RskA)	Anti-sigma-K factor rskA	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	ECF RNA polymerase sigma factor SigK	DNA binding binding organic cyclic compound binding nucleic acid binding transcription regulator activity DNA-binding transcription factor activity sigma factor activity	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 DNA-templated transcription initiation	cell periphery plasma membrane membrane cellular anatomical entity external encapsulating structure cell wall peptidoglycan-based cell wall
B	Anti-sigma-K factor RskA	sigma factor antagonist activity transcription corepressor activity transcription regulator activity transcription coregulator activity protein-macromolecule adaptor activity molecular adaptor activity	regulation of cellular process cellular biosynthetic process organonitrogen compound biosynthetic process regulation of primary metabolic process post-transcriptional regulation of gene expression organic substance metabolic process organic substance biosynthetic process protein metabolic process regulation of biosynthetic process regulation of biological process organonitrogen compound metabolic process cellular metabolic process regulation of protein metabolic process biological regulation regulation of cellular process cellular biosynthetic process organonitrogen compound biosynthetic process regulation of primary metabolic process post-transcriptional regulation of gene expression organic substance metabolic process organic substance biosynthetic process protein metabolic process regulation of biosynthetic process regulation of biological process organonitrogen compound metabolic process cellular metabolic process regulation of protein metabolic process biological regulation regulation of cellular metabolic process primary metabolic process regulation of macromolecule metabolic process gene expression translation macromolecule biosynthetic process regulation of cellular biosynthetic process regulation of gene expression biosynthetic process regulation of translation regulation of macromolecule biosynthetic process metabolic process cellular process macromolecule metabolic process regulation of metabolic process	cell periphery plasma membrane membrane cellular anatomical entity external encapsulating structure cell wall peptidoglycan-based cell wall

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR007627	RNA polymerase sigma-70 region 2	Domain
A	IPR013325	RNA polymerase sigma factor, region 2	Homologous Superfamily
A	IPR013324	RNA polymerase sigma factor, region 3/4-like	Homologous Superfamily
A	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
A	IPR014284	RNA polymerase sigma-70 like domain	Domain
A	IPR039425	RNA polymerase sigma-70 like	Family
A	IPR007630	RNA polymerase sigma-70 region 4	Domain
B	IPR041916	Anti-sigma factor, zinc-finger domain superfamily	Homologous Superfamily
B	IPR018764	Anti-sigma K factor RskA	Family

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.