Abstract
Polypeptides synthesized in Newcastle disease virus (NDV)-infected CHO cells in the absence of glycosylation were characterized. Incorporation of either [3H]mannose of [3H]glucosamine into NDV polypeptides was inhibited to greater than 99% by the antibiotic tunicamycin. Under these conditions, infected cells synthesized proteins which comigrated on polyacrylamide gels with the viral L protein, nucleocapsid protein, membrane protein, and a polypeptide with a molecular weight of 55,000 (P55). These cells did not synthesize polypeptides with the size of the hemagglutinin-neuraminidase (HN) protein or the fusion (F0) protein. They did, however, synthesize new polypeptides with molecular weights of 75,000 (P75), 67,000 (P67), and 52,000 (P52). Peptide analysis revealed that P75 was a host cell protein whose synthesis is enhanced by tunicamycin. P67 corresponded to the unglycosylated forms of the glycoproteins were found to be relatively stable in infected cells. P55, previously thought to correspond to the cleaved form of F0, was found to be a unique viral protein which is associated with intracellular nucleocapsid structures.
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