1887

Abstract

Translation elongation factor 1δ (EF-1δ) is hyperphosphorylated in various mammalian cells infected with alpha-, beta- and gammaherpesviruses and EF-1δ modification is mediated by viral protein kinases, including UL13 of herpes simplex virus type 1 and UL97 of human cytomegalovirus. In this study, the following is reported. (i) BGLF4 encoded by the prototype gammaherpesvirus Epstein–Barr virus was purified as a fusion protein that was labelled with [γ-P]ATP and labelling was eliminated by phosphatase. (ii) The ratio of the hyperphosphorylated form of human EF-1δ was increased both in Sf9 cells after infection with baculoviruses expressing GST–BGLF4 fusion proteins and in COS-7 cells after transfection with a BGLF4 expression plasmid. These results indicate that purified BGLF4 possesses protein kinase activity and mediates EF-1δ hyperphosphorylation. These data also support the hypothesis that the protein kinases that are conserved by herpesviruses universally mediate EF-1δ modification in mammalian cells.

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2001-06-01
2019-10-20
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