tRNA nuclease HepT

UniProtKB accession:  A0A0B0QJR1

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UniProtKB description:  Toxic component of a type VII toxin-antitoxin (TA) system. Upon cloning in E.coli inhibits cell growth for several hours; eventually cells recover and start growing. Cleaves the last 4 nucleotides from the tRNA acceptor stem (shown in vitro with E.coli tRNA-Glu(UUC)); only cleaves intact tRNA. Has no activity on mRNA. Neutralized by coexpression with cognate antitoxin MntA, which is due to di-AMPylation of the RNase.