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The Streptomyces coelicolor Polynucleotide Phosphorylase Homologue, and Not the Putative Poly(A) Polymerase, Can Polyadenylate RNA

Department of Genetics,¹ Department of Medicine, Stanford University School of Medicine, Stanford, California 94305-5120²

Received 30 July 2003/ Accepted 17 September 2003

A protein containing a nucleotidyltransferase motif characteristic of poly(A) polymerases has been proposed to polyadenylate RNA in Streptomyces coelicolor (P. Bralley and G. H. Jones, Mol. Microbiol. 40:1155-1164, 2001). We show that this protein lacks poly(A) polymerase activity and is instead a tRNA nucleotidyltransferase that repairs CCA ends of tRNAs. In contrast, a Streptomyces coelicolor polynucleotide phosphorylase homologue that exhibits polyadenylation activity may account for the poly(A) tails found in this organism.

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