Proc Natl Acad Sci U S A. 1986 May;83(10):3141-5.

Homology between RNA polymerases of poxviruses, prokaryotes, and eukaryotes: nucleotide sequence and transcriptional analysis of vaccinia virus genes encoding 147-kDa and 22-kDa subunits.

Abstract

We have determined the nucleotide sequence of a region of the vaccinia virus genome encoding RNA polymerase subunits of 22 and 147 kDa and have mapped the 5' and 3' ends of the two mRNAs. The predicted amino acid sequence of the vaccinia 147-kDa subunit shows extensive homology with the largest subunit of Escherichia coli RNA polymerase, yeast RNA polymerases II and III, and Drosophila RNA polymerase II. The regions of homology between the five RNA polymerases are subdivided into five separate domains that span most of the length of each. A sixth domain shared by the vaccinia and the eukaryotic polymerases is absent from the E. coli sequence. In all specified regions, the vaccinia large subunit has greater homology with eukaryotic RNA polymerases II and III than with the E. coli polymerase. Vaccinia virus and eukaryotic RNA polymerases may therefore have evolved from a common ancestral gene after the latter diverged from prokaryotes.

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Proc Natl Acad Sci U S A. 1986 May ;83(10):3141-5.

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Homology between RNA polymerases of poxviruses, prokaryotes, and eukaryotes: nucleotide sequence and transcriptional analysis of vaccinia virus genes encoding 147-kDa and 22-kDa subunits.

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