Modification of the 5'-terminus of MRNA by Soluble Guanylyl and Methyl Transferases from Vaccinia Virus

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1975 Jul 1

PMID 1058472

Citations 58

Authors

M J Ensinger

S A Martin

E Paoletti

B Moss

Affiliations

Soon will be listed here.

Abstract

RNA guanylyl and methyl transferases have been solubilized from vaccinia virus cores. The guanylyl transferase specifically adds a GMP residue to the 5'-terminus of unmethylated vaccinia virus mRNA to form the structures G(5')ppp(5')Gp- and G(5')ppp(5')Ap-. Studies with [alpha-32P]GTP and [beta, gamma-32P]GTP indicated that only the alpha-phosphate is transferred. In the presence of S-adenosylmethionine, the methyl transferases convert the blocked 5'-termini to m7G(5')ppp(5')Gmp- and m7G(5')ppp(5')Amp-. Similarly, the enzymes can modify synthetic poly(A) to form the structure m7G(5')ppp(5')Amp-.

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