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. 1992 Jul;66(7):4161–4169. doi: 10.1128/jvi.66.7.4161-4169.1992

Intracellular processing of the paramyxovirus F protein: critical role of the predicted amphipathic alpha helix adjacent to the fusion domain.

C Wang 1, G Raghu 1, T Morrison 1, M E Peeples 1
PMCID: PMC241219  PMID: 1602539

Abstract

At a nonpermissive temperature, the group D temperature-sensitive mutants of Newcastle disease virus strain Australia-Victoria (AV) are defective in plaque formation, in inducing infected cells to fuse, and in incorporating the cleaved fusion glycoprotein, F1 + F2, into virus particles. In this study, the F protein of AV, expressed in chicken embryo cells, was able to complement these mutants in a plaque assay, identifying the F gene as the gene containing the group D temperature-sensitive lesions. The F genes of mutants D1, D2, and D3 were found to contain single mutations relative to the AV sequence, clustered within a predicted amphipathic alpha helix (AAH) adjacent to the hydrophobic amino terminus of F1. These mutant F proteins were inefficiently processed at the permissive temperature, a problem that was exacerbated at the nonpermissive temperature. Surprisingly, the AV F protein was also found to be partially temperature sensitive in processing. Its AAH is predicted to contain a break in the helix close to the D mutation sites, which are themselves predicted to further weaken the helix at this point. Interestingly, six revertants of the group D mutants were found to have an additional lesion in the AAH, repairing both the AV and mutant helices, resulting in a predicted perfect helix. The F protein of these revertants had overcome both the processing defects of the mutants and the temperature sensitivity of AV, indicating that the AAH region is critical for F protein processing. The lesions of a second group of revertants were localized within F2, suggesting an interaction with the F1 AAH region containing the original lesion.

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Selected References

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