CRISPR-associated DNA-binding protein Cas12m
UniProtKB accession: H5TRP0
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Go to UniProtKB: H5TRP0
UniProtKB description: CRISPR (clustered regularly interspaced short palindromic repeat), is an adaptive immune system that provides protection against mobile genetic elements (viruses, transposable elements and conjugative plasmids) (PubMed:38261981). CRISPR clusters contain sequences complementary to antecedent mobile elements and target invading nucleic acids (PubMed:38261981). CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA) (PubMed:38261981). Recognizes a short motif in the CRISPR repeat sequences (the 5' PAM or protospacer adjacent motif, 5'-TTN-3' in this organism) to help distinguish self versus nonself, as targets within the bacterial CRISPR locus do not have PAMs (PubMed:38261981). Upon expression in E.coli as a CRISPR locus inhibits plasmid propagation when targeted to regions essential for plasmid propagation (replication origin and a selectable marker); inhibits expression of a non-selectable marker, probably at the transcriptional level (PubMed:38261981). Protects E.coli against bacteriophage M13mp18, to a lesser extent against lambda and VpaE1 as well as phage T4 with hydroxymethyl or unmodified (but not glycosylated) cytosines (PubMed:38261981). Preferentially binds to its associated crRNA (PubMed:38261981). Cas12m-crRNA binds DNA in a PAM-dependent, crRNA-guided fashion (PubMed:38261981). Binds a 20-bp crRNA-ss-target DNA heteroduplex, in a 52 nucleotide crRNA (PubMed:38261981). No dsDNA, ssDNA or RNA nuclease activity is seen for the crRNA-Cas12m complex (PubMed:38261981). Probably required for pre-crRNA processing to mature crRNA (Probable) (PubMed:38261981).
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