When chick embryo fibroblasts infected with high multiplicities of a non-revertible temperature-sensitive () mutant (53) of Newcastle disease virus (NDV) at the permissive temperature (34 °C) and incubated to allow the appearance of virus-induced proteins were shifted up to and incubated at the non-permissive temperature (42 °C), analysis of [H]leucine-labelled proteins by SDS-PAGE revealed a marked increase in cellular protein synthesis and a decline in viral synthesis, with an eventual return to an apparently uninfected state. Mutant 53 apparently ceased to suppress cellular protein synthesis, and translation of viral proteins was markedly inhibited. This was not observed in -infected cells, or in 53-infected cells maintained at the permissive temperature. Recovery from the infected state was inhibited by actinomycin D at any stage, but was not prevented by cycloheximide present immediately before and during temperature shift-up. Mutant 53 was shown to be RNA at 42 °C, although viral mRNAs synthesized at 34 °C are shown to be present throughout host recovery but in an inactive state.

Keyword(s): IFN , NDV , protein synthesis and ts

Article metrics loading...

Loading full text...

Full text loading...


Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error