CRISPR-associated endonuclease Cas2 / Virulence-associated protein D / CRISPR associated protein Cas2 / CRISPR associated protein Cas2 / maintenance of CRISPR repeat elements / RNA endonuclease activity / defense response to virus / 加水分解酵素; エステル加水分解酵素 / metal ion binding / CRISPR-associated endoribonuclease Cas2