Abstract
Previous studies have indicated that the U(L)6, U(L)15, U(L)17, U(L)28, U(L)32, and U(L)33 genes are required for the cleavage and packaging of herpes simplex viral DNA. To identify proteins that interact with the U(L)28-encoded DNA binding protein of herpes simplex virus type 1 (HSV-1), a previously undescribed rabbit polyclonal antibody directed against the U(L)28 protein fused to glutathione S-transferase was used to immunopurify U(L)28 and the proteins with which it associated. It was found that the antibody specifically coimmunoprecipitated proteins encoded by the genes U(L)28, U(L)15, and U(L)33 from lysates of both HEp-2 cells infected with HSV-1(F) and insect cells infected with recombinant baculoviruses expressing these three proteins. In reciprocal reactions, antibodies directed against the U(L)15- or U(L)33-encoded proteins also coimmunoprecipitated the U(L)28 protein. The coimmunoprecipitation of the three proteins from HSV-infected cells confirms earlier reports of an association between the U(L)28 and U(L)15 proteins and represents the first evidence of the involvement of the U(L)33 protein in this complex.
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