Annotations: 6O56

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	His-Me finger endonucleases	8048679	3001893	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	His-Me finger endonucleases	8048679	3001893	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	HNH_4	e6o56A1	A: few secondary structure elements	X: His-Me finger endonucleases (From Homology)	H: His-Me finger endonucleases	T: His-Me finger endonucleases	F: HNH_4	ECOD (1.6)
B	HNH_4	e6o56B1	A: few secondary structure elements	X: His-Me finger endonucleases (From Homology)	H: His-Me finger endonucleases	T: His-Me finger endonucleases	F: HNH_4	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF13395	HNH endonuclease (HNH_4)	HNH endonuclease	This HNH nuclease domain is found in CRISPR-related proteins.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	CRISPR-associated endonuclease Cas9/Csn1	DNA binding binding organic cyclic compound binding nucleic acid binding nuclease activity hydrolase activity, acting on ester bonds 3'-5' exonuclease activity hydrolase activity exonuclease activity catalytic activity DNA endonuclease activity endonuclease activity catalytic activity, acting on DNA catalytic activity, acting on a nucleic acid DNA binding binding organic cyclic compound binding nucleic acid binding nuclease activity hydrolase activity, acting on ester bonds 3'-5' exonuclease activity hydrolase activity exonuclease activity catalytic activity DNA endonuclease activity endonuclease activity catalytic activity, acting on DNA catalytic activity, acting on a nucleic acid DNA nuclease activity RNA binding cation binding ion binding metal ion binding small molecule binding	maintenance of CRISPR repeat elements chromosome organization primary metabolic process DNA metabolic process maintenance of DNA repeat elements nucleic acid metabolic process cellular component organization nucleobase-containing compound metabolic process organelle organization cellular process metabolic process cellular component organization or biogenesis macromolecule metabolic process biological process involved in interspecies interaction between organisms maintenance of CRISPR repeat elements chromosome organization primary metabolic process DNA metabolic process maintenance of DNA repeat elements nucleic acid metabolic process cellular component organization nucleobase-containing compound metabolic process organelle organization cellular process metabolic process cellular component organization or biogenesis macromolecule metabolic process biological process involved in interspecies interaction between organisms response to stimulus response to other organism defense response defense response to symbiont response to external stimulus response to biotic stimulus defense response to virus defense response to other organism response to stress response to external biotic stimulus response to virus	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR036397	Ribonuclease H superfamily	Homologous Superfamily
A, B	IPR032240	CRISPR-associated endonuclease Cas9, REC lobe	Domain
A, B	IPR032239	CRISPR-associated endonuclease Cas9, bridge helix	Domain
A, B	IPR033114	Cas9-type HNH domain	Domain
A, B	IPR028629	CRISPR-associated endonuclease Cas9	Family
A, B	IPR003615	HNH nuclease	Domain
A, B	IPR032237	CRISPR-associated endonuclease Cas9, PAM-interacting domain	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.