mRNA nuclease HepT

UniProtKB accession:  Q8ECH6

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UniProtKB description:  Toxic component of a type VII toxin-antitoxin (TA) system. A bacteriostatic toxin; upon overexpression in situ or in E.coli inhibits cell growth. Cells swell slightly. Neutralized by cognate antitoxin MntA (PubMed:26112399, PubMed:29555683, PubMed:33045733). Cleaves mRNA in a probably endonucleolytic manner; has no activity on rRNA, tRNA, ssDNA or dsDNA. The TA system confers plasmid stability in E.coli (PubMed:29555683). Neutralization is mostly due to tri-AMPylation by MntA (PubMed:33045733).