Stu0660-like CRISPR/Cas system-associated protein Csn2
Csn2 is a Nmeni subtype-specific Cas protein, which may function in the adaptation process which mediates the incorporation of foreign nucleic acids into the microbial host genome. Csn 2 may interact directly with double-stranded DNA. This family of Csn2 proteins includes Stu0660, the proteins are larger than other (canonical) Csn2 proteins as they have an additional alpha-helical C-terminal domain. CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) and associated Cas proteins comprise a system for heritable host defense by prokaryotic cells against phage and other foreign DNA. Csn2 has been predicted to be a functional analog of Cas4 based on anti-correlated phyletic patterns; also known as SPy1049 family.
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