Species Specificity of Human RPA in Simian Virus 40 DNA Replication Lies in T-antigen-dependent RNA Primer Synthesis

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2000 Nov 30

PMID 11095685

Citations 14

Authors

M Wang

J S Park

M Ishiai

J Hurwitz

S H Lee

Affiliations

Soon will be listed here.

Abstract

Replication protein A (RPA) is a three-subunit protein complex with multiple functions in DNA replication. Previous study indicated that human RPA (h-RPA) could not be replaced by Schizosaccharomyces pombe RPA (sp-RPA) in simian virus 40 (SV40) replication, suggesting that h-RPA may have a specific function in SV40 DNA replication. To understand the specificity of h-RPA in replication, we prepared heterologous RPAs containing the mixture of human and S.pombe subunits and compared these preparations for various enzymatic activities. Heterologous RPAs containing two human subunits supported SV40 DNA replication, whereas those containing only one human subunit poorly supported DNA replication, suggesting that RPA complex requires at least two human subunits to support its function in SV40 DNA replication. All heterologous RPAs effectively supported single-stranded (ss)DNA binding activity and an elongation of a primed DNA template catalyzed by DNA polymerase (pol) alpha and delta. A strong correlation between SV40 DNA replication activity and large tumor antigen (T-ag)-dependent RNA primer synthesis by pol alpha-primase complex was observed among the heterologous RPAs. Furthermore, T-ag showed a strong interaction with 70- and 34-kDa subunits from human, but poorly interacted with their S.pombe counterparts, indicating that the specificity of h-RPA is due to its role in RNA primer synthesis. In the SV40 replication reaction, the addition of increasing amounts of sp-RPA in the presence of fixed amount of h-RPA significantly reduced overall DNA synthesis, but increased the size of lagging strand, supporting a specific role for h-RPA in RNA primer synthesis. Together, these results suggest that the specificity of h-RPA in SV40 replication lies in T-ag-dependent RNA primer synthesis.

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