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. 1991 Aug;65(8):4359–4369. doi: 10.1128/jvi.65.8.4359-4369.1991

Analysis of the herpes simplex virus type 1 OriS sequence: mapping of functional domains.

D W Martin 1, S P Deb 1, J S Klauer 1, S Deb 1
PMCID: PMC248875  PMID: 1649335

Abstract

The herpes simplex virus type 1 (HSV-1) OriS region resides within a 90-bp sequence that contains two binding sites for the origin-binding protein (OBP), designated sites I and II. A third presumptive OBP-binding site (III) within OriS has strong sequence similarity to sites I and II, but no sequence-specific OBP binding has yet been demonstrated at this site. We have generated mutations in sites I, II, and III and determined their replication efficiencies in a transient in vivo assay in the presence of a helper virus. Mutations in any one of the sites reduced DNA replication significantly. To study the role of OriS sequence elements in site I and the presumptive site III in DNA replication, we have also generated a series of mutations that span from site I across the presumptive binding site III. These mutants were tested for their ability to replicate and for the ability to bind OBP by using gel shift analyses. The results indicate that mutations across site I drastically reduce DNA replication. Triple-base-pair substitution mutations that fall within the crucial OBP-binding domain, 5'-YGYTCGCACT-3' (where Y represents C or T), show a reduced level of OBP binding and DNA replication. Substitution mutations in site I that are outside this crucial binding sequence show a more detrimental effect on DNA replication than on OBP binding. This suggests that these sequences are required for initiation of DNA replication but are not critical for OBP binding. Mutations across the presumptive OBP-binding site III also resulted in a loss in efficiency of DNA replication. These mutations influenced OBP binding to OriS in gel shift assays, even though the mutated sequences are not contained within known OBP-binding sites. Replacement of the wild-type site III with a perfect OBP-binding site I results in a drastic reduction of DNA replication. Thus, our DNA replication assays and in vitro DNA-binding studies suggest that the binding of the origin sequence by OBP is not the only determining factor for initiation of DNA replication in vivo.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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