Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ACas9_RECe4ogeA1 A: alpha complex topologyX: CRISPR-associated endonuclease Cas9 alpha-helical lobeH: CRISPR-associated endonuclease Cas9 alpha-helical lobe (From Topology)T: CRISPR-associated endonuclease Cas9 alpha-helical lobeF: Cas9_RECECOD (1.6)
AEUF08428e4ogeA6 A: a+b two layersX: SSHS domainH: SSHS domain in CRISPR-associated endonuclease Cas9 (From Topology)T: SSHS domain in CRISPR-associated endonuclease Cas9F: EUF08428ECOD (1.6)
AEUF08576e4ogeA4 A: a+b complex topologyX: CRISPR-associated endonuclease Cas9 C-terminal domain (From Topology)H: CRISPR-associated endonuclease Cas9 C-terminal domain (From Topology)T: CRISPR-associated endonuclease Cas9 C-terminal domainF: EUF08576ECOD (1.6)
AEUF08579e4ogeA5 A: a+b complex topologyX: CRISPR-associated endonuclease Cas9 beta-hairpin domain (From Topology)H: CRISPR-associated endonuclease Cas9 beta-hairpin domain (From Topology)T: CRISPR-associated endonuclease Cas9 beta-hairpin domainF: EUF08579ECOD (1.6)
ACsn1_likee4ogeA3 A: mixed a+b and a/bX: Ribonuclease H-likeH: Ribonuclease H-like (From Topology)T: Ribonuclease H-likeF: Csn1_likeECOD (1.6)
AHNH_5e4ogeA2 A: few secondary structure elementsX: His-Me finger endonucleases (From Homology)H: His-Me finger endonucleasesT: His-Me finger endonucleasesF: HNH_5ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.30.420.10 Alpha Beta 2-Layer Sandwich Nucleotidyltransferase domain 5CATH (4.3.0)
A3.30.70.3520 Alpha Beta 2-Layer Sandwich Alpha-Beta Plaits CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF01844HNH endonuclease (HNH)HNH endonuclease- Family
PF18470Cas9 alpha-helical lobe domain (Cas9_a)Cas9 alpha-helical lobe domainThis is an alpha-helical lobe domain found in Cas9 proteins. Cas9 enzymes adopt a bilobed architecture composed of a nuclease lobe containing juxtaposed RuvC and HNH nuclease domains and a variable alpha-helical lobe likely to be involved in nucleic ...This is an alpha-helical lobe domain found in Cas9 proteins. Cas9 enzymes adopt a bilobed architecture composed of a nuclease lobe containing juxtaposed RuvC and HNH nuclease domains and a variable alpha-helical lobe likely to be involved in nucleic acid binding. Amino acid residues located in both the nuclease and alpha-helical lobe clefts are highly conserved within type II-A Cas9 proteins [1].
Domain
PF17893CRISPR-associated endonuclease Cas9 beta-hairpin domain (Cas9_b_hairpin)CRISPR-associated endonuclease Cas9 beta-hairpin domainThis is beta-hairpin domain found in Cas9 proteins from Actinobacteria. The beta-hairpin domain is not conserved in all type II-C Cas9 proteins. The beta-hairpin in Cas 9 from Streptococcus pyogenes blocks the HNH domain active site [1].Domain
PF17894Topo homolgy domain in CRISPR-associated endonuclease Cas9 (Cas9_Topo)Topo homolgy domain in CRISPR-associated endonuclease Cas9This is the Topo-homology domain found in Cas9 proteins from Actinobacteria. This domain bears structural similarity to a domain found in topoisomerase II [1].Domain
PF18541RuvC endonuclease subdomain 3 (RuvC_III)RuvC endonuclease subdomain 3Cas9 proteins are abundant across the bacterial kingdom, but vary widely in both sequence and size. All known Cas9 enzymes contain an HNH domain that cleaves the DNA strand complementary to the guide RNA sequence (target strand), and a RuvC nuclease ...Cas9 proteins are abundant across the bacterial kingdom, but vary widely in both sequence and size. All known Cas9 enzymes contain an HNH domain that cleaves the DNA strand complementary to the guide RNA sequence (target strand), and a RuvC nuclease domain required for cleaving the noncomplementary strand (non-target strand), yielding double-strand DNA breaks (DSBs). The crystal structures of type II-A and II-C Cas9 proteins highlight the features in Cas9 enzymes that support their function as RNA-guided endonucleases. Cas9 enzymes adopt a bilobed architecture composed of a nuclease lobe containing juxtaposed RuvC and HNH nuclease domains and a variable alpha-helical lobe likely to be involved in nucleic acid binding. The RuvC domain forms the structural core of the nuclease lobe, a six-stranded beta sheet surrounded by four alpha helices, with all three conserved subdomains (I, II, III) contributing catalytic residues to the active site [1].
Domain
PF18525Cas9 C-terminal domain (Cas9_C)Cas9 C-terminal domainThis is the C-terminal domain of Cas9 enzymes found in actinobacteria [1].Domain