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. 1974 Nov;14(5):1083–1091. doi: 10.1128/jvi.14.5.1083-1091.1974

Time Course of Synthesis and Assembly of Influenza Virus Proteins

Herbert Meier-Ewert 1,1, Richard W Compans 1
PMCID: PMC355623  PMID: 4473567

Abstract

The synthesis of viral polypeptides was analyzed in BHK-21-F cells infected with the WSN strain of influenza virus at various times in the growth cycle. The relative amounts of polypeptides P, HA, NP, and NS did not change markedly between early and late times in the growth cycle; however, there was a progressive increase in the relative amount of the M polypeptide at later time points. In cell fractionation experiments, the patterns of newly synthesized polypeptides associated with various cytoplasmic fractions remained similar throughout the growth cycle except for an increase in polypeptide M in all fractions late in the growth cycle. The HA polypeptide was chased out of cytoplasmic membranes completely 6 h after synthesis, whereas the M polypeptide was not chased effectively from such membranes. Marked differences were found in the incorporation into mature virions of polypeptides synthesized at different times in the growth cycle. Polypeptides P and NP synthesized at early times were incorporated preferentially, whereas M was synthesized and incorporated predominantly late in the growth cycle. The fact that the rates of incorporation of polypeptides into virions differed significantly from their rates of synthesis indicates that different polypeptides were assembled into virions by distinct pathways.

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Selected References

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