Purification of mRNA guanylyltransferase from vaccinia virions.
GTP:RNA guanylyltransferase, the enzyme which catalyzes the guanylylation of the 5' termini of viral mRNAs, has been isolated and purified approximately 10,000-fold from cores of vaccinia virus. S-adenosyl-methionine:mRNA (guanine-7)-methyltransferase copurified with guanylyltransferase activity through chromatography on DNA agarose, phosphocellulose, and centrifugation in glycerol gradients, suggesting that the two activities are closely associated. The molecular weight of native guanylyltransferase- and 7-methyltransferase-associated activities was approximately 120,000 as determined by glycerol gradient centrifugation. Guanylytransferase purified by electrophoresis on polyacrylamide gels at pH 4.5 lacked 7-methyltransferase activity. Analysis by electrophoresis on sodium dodecyl sulfate-polyacrylamide gels of electrophoretically purified native guanylyltransferase showed the presence of one major band of polypeptide which had a molecular weight of approximately 59,000.
D006150:Guanine Nucleotides; D008780:Methyltransferases / Q000302:isolation & purification / Q000378:metabolism; D009713:Nucleotidyltransferases / Q000302:isolation & purification* / Q000378:metabolism; D012333:RNA, Messenger; D014616:Vaccinia virus / Q000201:enzymology*; D014771:Virion / Q000201:enzymology; D000098556:mRNA Guanylyltransferases
D006150:Guanine Nucleotides; D012333:RNA, Messenger; D008780:Methyltransferases; D009713:Nucleotidyltransferases; D000098556:mRNA Guanylyltransferases