CRISPR-associated endodeoxyribonuclease Cas12f1

UniProtKB accession:  A0A2U3D0N8

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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). CRISPR clusters contain sequences complementary to antecedent mobile elements and target invading nucleic acids (Probable). CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA), which requires a trans-encoded small RNA (tracrRNA), but not this protein (By similarity). Recognizes a short motif in the CRISPR repeat sequences (the 5' PAM or protospacer adjacent motif, YTT in this organism) to help distinguish self versus nonself, as targets within the CRISPR locus do not have PAMs. Has dsDNA endonuclease activity upon expression in E.coli of this protein, a mini CRISPR array and the probable tracrRNA. Plasmid cleavage is centered around positions 19-24 base pairs 3' of PAM. The mini system protects E.coli against transformation by foreign plasmids (PubMed:32246713).