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The human cytomegalovirus (HCMV) IE86 protein induces the human fibroblast cell cycle from G(0)/G(1) to G(1)/S, where cell cycle progression stops. Cells with a wild-type, mutated, or null p53 or cells with null p21 protein were transduced with replication-deficient adenoviruses expressing HCMV IE86 protein or cellular p53 or p21. Even though S-phase genes were activated in a p53 wild-type cell, IE86 protein also induced phospho-Ser(15) p53 and p21 independent of p14ARF but dependent on ATM kinase. These cells did not enter the S phase. In human p53 mutant, p53 null, or p21 null cells, IE86 protein did not up-regulate p21, cellular DNA synthesis was not inhibited, but cell division was inhibited. Cells accumulated in the G(2)/M phase, and there was increased cyclin-dependent kinase 1/cyclin B1 activity. Although the HCMV IE86 protein increases cellular E2F activity, it also blocks cell division in both p53(+/+) and p53(-/-) cells.

Inhibition of Cell Division by the Human Cytomegalovirus IE86 Protein: Role of the p53 Pathway or Cyclin-Dependent Kinase 1/Cyclin B1