Studies with poliovirus polymerase 3Dpol. Stimulation of poly(U) synthesis in vitro by purified poliovirus protein 3AB.
The synthesis in vitro of poly(U) on a poly(A) template with oligo(dT)15 primer by poliovirus RNA polymerase 3Dpol (280 ng/ml) is strongly stimulated (50-100 fold) by the addition of purified poliovirus polypeptide 3AB. The synthesis of product continues linearly with time for up to 90 min. The reaction with 3Dpol alone can be reactivated and similarly enhanced by the addition of 3AB at 30 min of incubation. Optimal stimulation is achieved under conditions where the concentration of 3Dpol and of template is low, when the molar ratio of 3AB to 3Dpol is about 100:1 and that of 3AB to poly(A) is about 25:1. In the presence of 3AB, the yield of product made by 3Dpol is much increased but its size is unchanged. From a number of basic proteins and peptides tested, a few were found which also exhibited limited enhancement of polymerase activity. The stimulatory effect of 3AB is probably related to its ability to bind both the template-primer, poly(A).oligo(dT)15, and 3Dpol (Molla, A., Harris, K. S., Paul, A. V., Shin, S. H., Mugavero, J., and Wimmer, E. J. (1994) J. Biol. Chem. 269, 27015-27020). RNA synthesis on purified poliovirus RNA with oligo(dT)15 primer is enhanced by 3AB about 5-10 fold, and this reaction is highly sensitive to detergent.
Department of Molecular Genetics and Microbiology, School of Medicine, State University of New York at Stony Brook 11790-5222.
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D000595:Amino Acid Sequence; D001483:Base Sequence; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism*; D004789:Enzyme Activation; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides; D017955:Poliovirus / Q000201:enzymology*; D011061:Poly A / Q000494:pharmacology; D011072:Poly U / Q000096:biosynthesis*; D011485:Protein Binding; D012367:RNA, Viral / Q000096:biosynthesis*; D012324:RNA-Dependent RNA Polymerase; D013936:Thymidine / Q000494:pharmacology; D014758:Viral Core Proteins / Q000302:isolation & purification / Q000502:physiology*
D009838:Oligodeoxyribonucleotides; D012367:RNA, Viral; D014758:Viral Core Proteins; D011061:Poly A; D011072:Poly U; C090443:polymerase 3Dpol, poliovirus; D012324:RNA-Dependent RNA Polymerase; D012321:DNA-Directed RNA Polymerases; D013936:Thymidine