mRNA interferase toxin YafQ

UniProtKB accession:  Q47149

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UniProtKB description:  Toxic component of a type II toxin-antitoxin (TA) system (PubMed:17263853). A sequence-specific mRNA endoribonuclease that inhibits translation elongation and induces bacterial stasis (PubMed:19210620). Cleavage occurs between the second and third residue of the Lys codon followed by a G or A (5'AAA(G/A)3'), is reading-frame dependent and occurs within the 5' end of most mRNAs (PubMed:19210620). Ribosome-binding confers the sequence specificity and reading frame-dependence (PubMed:19210620). When overexpressed in liquid media YafQ partially inhibits protein synthesis, with a reduction in growth rate and colony growth rate. This effect is counteracted by coexpression with cognate antitoxin DinJ (PubMed:17263853). YafQ and DinJ together bind their own promoter, and repress its expression (PubMed:24898247).