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A recombinant baculovirus containing the complete sequence for the Epstein-Barr virus (EBV) BMRF1 gene product, the EBV DNA polymerase accessory protein, under the control of the polyhedrin promoter was constructed. Insect cells infected with the recombinant virus produced two phosphoproteins of 52 and 50 kDa and one unphosphorylated protein of 48 kDa, recognized by anti-BMRF1 protein-specific monoclonal antibody. The major protein bands were 50 and 48 kDa. The expressed BMRF1 gene products were purified to near homogeneity from the nuclear extract of the recombinant baculovirus-infected insect cells by double-stranded DNA-cellulose column chromatography followed by heparin-agarose column chromatography. The purified BMRF1 gene products exhibited higher binding affinity for double-stranded DNA than for single-stranded DNA without ATP hydrolysis. The protein-DNA interaction did not necessarily require a primer terminus. The present system will open the way for the biochemical characterization of the EBV DNA polymerase accessory protein.

journal of virology

Purification and characterization of the DNA-binding activity of the Epstein-Barr virus DNA polymerase accessory protein BMRF1 gene products, as expressed in insect cells by using the baculovirus system