Discovery of the widespread site-specific single-stranded nuclease family Ssn.

ABSTRACT: Site-specific endonucleases that exclusively cut single-stranded DNA have hitherto never been described and constitute a barrier to the development of ssDNA-based technologies. We identify and characterize one such family, from the GIY-YIG superfamily, of widely distributed site-specific single-stranded nucleases (Ssn) exhibiting unique ssDNA cleavage properties. By first comprehensively studying the Ssn homolog from Neisseria meningitidis, we demonstrate that it interacts specifically with a sequence (called NTS) present in hundreds of copies and surrounding important genes in pathogenic Neisseria. In this species, NTS/Ssn interactions modulate natural transformation and thus constitute an additional mechanism shaping genome dynamics. We further identify thousands of Ssn homologs and demo

SUBMITTER: Chenal M 

PROVIDER: S-EPMC11893778 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature