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. 1986 Sep 25;14(18):7305–7323. doi: 10.1093/nar/14.18.7305

Selection of template initiation sites and the lengths of RNA primers synthesized by DNA primase are strongly affected by its organization in a multiprotein DNA polymerase alpha complex.

J K Vishwanatha, M Yamaguchi, M L DePamphilis, E F Baril
PMCID: PMC311753  PMID: 2429260

Abstract

Synthesis of (p)ppRNA-DNA chains by purified HeLa cell DNA primase-DNA polymerase alpha (pol alpha-primase) was compared with those synthesized by a multiprotein form of DNA polymerase alpha (pol alpha 2) using unique single-stranded DNA templates containing the origin of replication for simian virus 40 (SV40) DNA. The nucleotide locations of 33 initiation sites were identified by mapping G*pppN-RNA-DNA chains and identifying their 5'-terminal ribonucleotide. Pol alpha 2 strongly preferred initiation sites that began with ATP rather than GTP, thus frequently preferring different initiation sites than pol alpha-primase, depending on the template examined. The initiation sites selected in vitro, however, did not correspond to the sites used during SV40 DNA replication in vivo. Pol alpha 2 had the greatest effect on RNA primer size, typically synthesizing primers 1-5 nucleotides long, while pol alpha-primase synthesized primers 6-8 nucleotides long. These differences were observed even at individual initiation sites. Thus, the multiprotein form of DNA primase-DNA polymerase alpha affects selection of initiation sites, the frequency at which the sites are chosen, and length of RNA primers.

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Selected References

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