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Comparative Study
. 1998 Apr;4(4):455-70.

Mechanistic analysis of RNA synthesis by RNA-dependent RNA polymerase from two promoters reveals similarities to DNA-dependent RNA polymerase

S Adkins  1 , S S Stawicki, G Faurote, R W Siegel, C C Kao
Affiliations
Comparative Study

Mechanistic analysis of RNA synthesis by RNA-dependent RNA polymerase from two promoters reveals similarities to DNA-dependent RNA polymerase

S Adkins et al. RNA. 1998 Apr.

Abstract

The brome mosaic virus (BMV) RNA-dependent RNA polymerase (RdRp) directs template-specific synthesis of (-)-strand genomic and (+)-strand subgenomic RNAs in vitro. Although the requirements for (-)-strand RNA synthesis have been characterized previously, the mechanism of subgenomic RNA synthesis has not. Mutational analysis of the subgenomic promoter revealed that the +1 cytidylate and the +2 adenylate are important for RNA synthesis. Unlike (-)-strand RNA synthesis, which required only a high GTP concentration, subgenomic RNA synthesis required high concentrations of both GTP and UTP. Phylogenetic analysis of the sequences surrounding the initiation sites for subgenomic and genomic (+)-strand RNA synthesis in representative members of the alphavirus-like superfamily revealed that the +1 and +2 positions are highly conserved as a pyrimidine-adenylate. GDP and dinucleotide primers were able to more efficiently stimulate (-)-strand synthesis than subgenomic synthesis under conditions of limiting GTP. Oligonucleotide products of 6-, 7-, and 9-nt were synthesized and released by RdRp in 3-20-fold molar excess to full-length subgenomic RNA. Termination of RNA synthesis by RdRp was not induced by template sequence alone. Our characterization of the stepwise mechanism of subgenomic and (-)-strand RNA synthesis by RdRp permits comparisons to the mechanism of DNA-dependent RNA synthesis.

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References

    1. J Biochem. 1973 Aug;74(2):263-71 - PubMed
    1. J Mol Biol. 1992 Mar 20;224(2):319-34 - PubMed
    1. Proc Natl Acad Sci U S A. 1979 Oct;76(10):4956-60 - PubMed
    1. FEBS Lett. 1980 Jan 1;109(1):145-50 - PubMed
    1. Proc Natl Acad Sci U S A. 1980 May;77(5):2601-5 - PubMed

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