In the type II CRISPR-Cas system, the Cas9 effector nuclease associates with dual guide RNAs (crRNA and trans-activating crRNA (tracrRNA)) and cleaves double-stranded DNA targets complementary to the crRNA guide. Cas9 is composed of multiple domains. ...
In the type II CRISPR-Cas system, the Cas9 effector nuclease associates with dual guide RNAs (crRNA and trans-activating crRNA (tracrRNA)) and cleaves double-stranded DNA targets complementary to the crRNA guide. Cas9 is composed of multiple domains. This entry represents the C-terminal lobe of the so-called PAM-interacting domain (PI-CTD) that is found in Campylobacter jejuni Cas9 (CjCas9), one of the smallest Cas9 orthologues. The PI domain is involved in the recognition of PAM-containing duplex formed by the target and non-target DNA strands. This domain facilitates the target DNA unwinding and the heteroduplex formation. The CjCas9 PI-CTD domain adopts a partly open six-stranded beta-barrel with a SH3-like topology [1].
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 ...
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].
In the type II CRISPR-Cas system, the Cas9 effector nuclease associates with dual guide RNAs (crRNA and trans-activating crRNA (tracrRNA)) and cleaves double-stranded DNA targets complementary to the crRNA guide. Cas9 is composed of multiple domains. ...
In the type II CRISPR-Cas system, the Cas9 effector nuclease associates with dual guide RNAs (crRNA and trans-activating crRNA (tracrRNA)) and cleaves double-stranded DNA targets complementary to the crRNA guide. Cas9 is composed of multiple domains. This entry represents the so-called wedge (WED) domain that is found in Campylobacter jejuni Cas9 (CjCas9), one of the smallest Cas9 orthologues. The WED domain is involved in the recognition of PAM-containing duplex formed by the target and non-target DNA strands. The CjCas9 WED domain consists of a beta-hairpin packed with two short alpha-helices [1].
