Reaction: Exonucleolytic cleavage that removes extra residues from the 3'-terminus of tRNA to produce 5'-mononucleotides
Other name(s): RNase D
Comments: Requires divalent cations for activity (Mg2+, Mn2+ or Co2+). Alteration of the 3'-terminal base has no effect on the rate of hydrolysis whereas modification of the 3'-terminal sugar has a major effect. tRNA terminating with a 3'-phosphate is completely inactive [3]. This enzyme can convert a tRNA precursor into a mature tRNA [2].
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:
References:
1. Ghosh, R.K. and Deutscher, M.P. Identification of an Escherichia coli nuclease acting on structurally altered transfer RNA molecules. J. Biol. Chem. 253 (1978) 997-1000. [PMID: 342522]
2. Cudny, H., Zaniewski, R. and Deutscher, M.P. Escherichia coli RNase D. Purification and structural characterization of a putative processing nuclease. J. Biol. Chem. 256 (1981) 5627-5632. [PMID: 6263885]
3. Cudny, H., Zaniewski, R. and Deutscher, M.P. Escherichia coli RNase D. Catalytic properties and substrate specificity. J. Biol. Chem. 256 (1981) 5633-5637. [PMID: 6263886]
4. Zhang, J.R. and Deutscher, M.P. Cloning, characterization, and effects of overexpression of the Escherichia coli rnd gene encoding RNase D. J. Bacteriol. 170 (1988) 522-527. [PMID: 2828310]