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Mol Cell Biol. 1991 April; 11(4): 2108-2115

Effects of T antigen and replication protein A on the initiation of DNA synthesis by DNA polymerase alpha-primase.

K L Collins and T J Kelly

Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.

ABSTRACT

Studies of simian virus 40 (SV40) DNA replication in a reconstituted cell-free system have established that T antigen and two cellular replication proteins, replication protein A (RP-A) and DNA polymerase alpha-primase complex, are necessary and sufficient for initiation of DNA synthesis on duplex templates containing the SV40 origin of DNA replication. To better understand the mechanism of initiation of DNA synthesis, we analyzed the functional interactions of T antigen, RP-A, and DNA polymerase alpha-primase on model single-stranded DNA templates. Purified DNA polymerase alpha-primase was capable of initiating DNA synthesis de novo on unprimed single-stranded DNA templates. This reaction involved the synthesis of a short oligoribonucleotide primer which was then extended into a DNA chain. We observed that the synthesis of ribonucleotide primers by DNA polymerase alpha-primase is dramatically stimulated by SV40 T antigen. The presence of T antigen also increased the average length of the DNA product synthesized on primed and unprimed single-stranded DNA templates. These stimulatory effects of T antigen required direct contact with DNA polymerase alpha-primase complex and were most marked at low template and polymerase concentrations. We also observed that the single-stranded DNA binding protein, RP-A, strongly inhibits the primase activity of DNA polymerase alpha-primase, probably by blocking access of the enzyme to the template. T antigen partially reversed the inhibition caused by RP-A. Our data support a model in which DNA priming is mediated by a complex between T antigen and DNA polymerase alpha-primase with the template, while RP-A acts to suppress nonspecific priming events.

Mol Cell Biol. 1991 April; 11(4): 2108-2115




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