1887

Abstract

The DNA polymerase from nucleopolyhedrovirus (SpliNPV) was expressed in, and purified from, prokaryotic and eukaryotic expression systems. While less protein was obtained from the expression system, SpliNPV DNAPOL purified from displayed similar biochemical characteristics to DNAPOL expressed in, and subsequently purified from, insect cells (Sf9) using a baculovirus expression system. Biochemical analyses suggested that the DNA polymerase and the 3′–5′ exonuclease activities are intrinsic to the protein. Deletion of the first 80 amino acid residues from the N terminus of the DNAPOL affected neither the DNA polymerase nor the exonuclease activities of the enzyme. Replication products from single-stranded M13 DNA demonstrated that the DNA synthesis activity of SpliNPV DNAPOL is highly processive. Transient expression assays with a set of deletion clones containing the putative SpliNPV non- origin of DNA replication permitted functional characterization of sequence elements within the origin fragment. Purified SpliNPV DNAPOL stimulated origin-dependent DNA replication in a cell-free replication assay.

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2001-07-01
2019-10-17
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