Intracellular synthesis of measles virus-specified polypeptides
- PMID: 621777
- PMCID: PMC353925
- DOI: 10.1128/JVI.25.1.285-297.1978
Intracellular synthesis of measles virus-specified polypeptides
Abstract
The intracellular synthesis of measles-specified polypeptides was examined by means of polyacrylamide gel electrophoresis of cell extracts. Since measles virus does not efficiently shut off host-cell protein synthesis, high multiplicities of infection were used to enable viral polypeptides to be detected against the high background of cellular protein synthesis. The cytoplasm of infected cells contained viral structural polypeptides with estimated molecular weights of 200,000, 80,000, 70,000, 60,000, 41,000, and 37,000. All of these structural polypeptides, with the exception of P1, the only virion glycoprotein (molecular weight congruent to 80,000), were also found in the nuclei. In addition, two nonstructural polypeptides with estimated molecular weights of 74,000 and 72,000 were also present in the cytoplasm of infected cells. The initial synthesis of the smaller, nonstructural polypeptide began later in infection than the structural polypeptides. Pulse-chase experiments failed to detect any precursor-product relationships. The intracellular glycosylation and phosphorylation of the viral polypeptides were found to be similar to those found in purified virions.
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