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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Herpes simplex virus type 1 regulatory protein ICP0 does not protect cyclins D1 and D3 from degradation during infection.

Previous reports have suggested that herpes simplex virus type 1 (HSV-1) immediate-early regulatory protein ICP0 stabilizes cyclins D1 and D3 during infection by inducing the degradation of cdc34, the E2-conjugating enzyme that is responsible for regulating the stability of these cyclins. Since ICP0 has complex effects on the progress of viral infection that vary greatly with cell type and viral dose, it can be difficult to distinguish between direct effects caused by ICP0 itself and indirect effects caused by the rate of the progression of infection in the absence of ICP0 at the chosen multiplicity of infection. This report describes the fates of cdc34 and cyclins D1 and D3 during HSV-1 infection under conditions that ensured that viral infection and gene expression were proceeding at equivalent rates in the presence and absence of ICP0. It was confirmed that both D-type cyclins were unstable during HSV-1 infection of a variety of cell types, but no effect on cdc34 was observed, even when high levels of ICP0 were expressed. Furthermore, there was no evidence that ICP0 protected either cyclin D1 or cyclin D3 from degradation. Reconstruction of the conditions of the experiments in the previous studies, using the stated cell type and multiplicities of infection, indicated that the original results could be explained by differences in the rate of progression of infection rather than by the presence or absence of ICP0. The data presented in this report are incompatible with the hypothesis that ICP0 induces the degradation of cdc34 and thereby stabilizes cyclins D1 and D3 during HSV-1 infection.[1]

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