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Measles virus does not turn off host cell polypeptide synthesis, making it difficult to precisely identify the polypeptides specified by the virus during the infectious cycle. By using the technique of immune precipitation with measles-specific antisera, the host cell background has been eliminated, and new observations have been made concerning measles virus polypeptides H, P, NP, F, and M. The H polypeptide is first synthesized as a monomer which is processed by further glycosylation and by the formation of disulfide-bonded dimers. Polypeptide P (70,000 daltons) has been found to occur also as a 65,000-dalton molecule, P2, and both forms of the molecule are equally phosphorylated. Polypeptide NP is processed from a cleavage-sensitive form (which undergoes cleavage during the process of isolation to form polypeptide 6 [41,000 daltons]) to a form which is resistant to this cleavage. The fusion and hemolysin polypeptide is first found in the cells as a 55,000-dalton precursor, F0, which is clearly resolved from the NP polypeptide on gel electrophoresis. The measles virus F0 protein identified in previous reports had not been resolved from the 60,000-dalton NP polypeptide. The M protein occurs in the infected cells as two distinct bands, and, as in the case of Sendai virus, one of these two M protein bands represents a phosphorylated form of the other.

Measles virus polypeptides in infected cells studied by immune precipitation and one-dimensional peptide mapping