Acquisition of [poly(A) Polymerase I] Genes Via Horizontal Transfer from the β, γ-
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Poly(A) polymerases (PAPs) and tRNA nucleotidyltransferases belong to a superfamily of nucleotidyltransferases and modify RNA 3'-ends. The product of the gene, PAP I, has been characterized in a few β-, γ- and δ-. Using the PAP I signature sequence, putative PAPs were identified in bacterial species from the α- and ε- and from four other bacterial phyla (, , and ). Phylogenetic analysis, alien index and G+C content calculations strongly suggest that the PAPs in the species identified in this study arose by horizontal gene transfer from the β- and γ-.
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