Physical and functional interaction of human cytomegalovirus DNA polymerase and its accessory protein (ICP36) expressed in insect cells.

Ertl PF, Powell KL
J Virol (1992), Volume 66, Page 4126
PubMed entry Full article text


Expression of the human cytomegalovirus (HCMV) (AD169) DNA polymerase ...
Expression of the human cytomegalovirus (HCMV) (AD169) DNA polymerase gene under the control of the polyhedrin promoter of Autographa californica nuclear polyhedrosis virus in Spodoptera frugiperda (Sf9) cells has provided a source of highly active CMV DNA polymerase. In extracts from CMV-infected cells, the CMV DNA polymerase is found strongly associated with an additional polypeptide, ICP36. This protein has been identified as the CMV homolog of the herpes simplex virus type 1 UL42 gene product and may have a similar function. We have expressed HCMV DNA polymerase and ICP36 in the same system and demonstrated that they interact to form a stable complex. Moreover, ICP36 functions to stimulate the DNA polymerase activity in a template-dependent manner. We have compared the activity of the recombinant DNA polymerase in the presence and absence of ICP36 on a number of DNA templates and measured the effect of the polymerase inhibitors phosphonoformic acid and acyclovir triphosphate.




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