Colicin D is a tRNase which kills sensitive E.coli cells via a specific tRNA cleavage. It targets the four isoaccepting tRNAs for Arg and cleaves the phosphodiester bond between positions 38 and 39 at the 3' junction of the anticodon stem and the loop [1].

1: Relation between tRNase activity and the structure of colicin D according to X-ray crystallography. Yajima S, Nakanishi K, Takahashi K, Ogawa T, Hidaka M, Kezuka Y, Nonaka T, Ohsawa K, Masaki H; Biochem Biophys Res Commun. 2004;322:966-973. PMID:15336558