Cellular serine/threonine phosphatase activity during human cytomegalovirus infection

Morgan Hakki, Adam P. Geballe

Research output: Contribution to journalArticle

14 Scopus citations


While the importance of cellular and viral kinases in HCMV replication has been demonstrated, relatively little is known about the activity of cellular phosphatases. We conducted a series of experiments designed to investigate the effect of HCMV infection on cellular serine/threonine phosphatase activity. We found that the abundance of two major cellular serine/threonine phosphatases, PP1 and PP2A, increases during HCMV infection. This was associated with an increase in threonine phosphatase activity in HCMV-infected cells. HCMV infection conferred resistance to the effects of the phosphatase inhibitors calyculin A (CA) and okadaic acid with regards to global protein hyperphosphorylation and the shutoff of protein synthesis. The protective effect of HCMV infection could be overcome at a high concentration of CA, suggesting that cellular phosphatase activity is required for critical cellular processes during HCMV infection. Specifically, phosphatase activity was required to limit the accumulation of phospho-eIF2α, but not phospho-PKR, during HCMV infection.

Original languageEnglish (US)
Pages (from-to)255-263
Number of pages9
Issue number2
StatePublished - Oct 25 2008
Externally publishedYes


  • Cytomegalovirus
  • Phosphatase

ASJC Scopus subject areas

  • Virology

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