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The gene encoding the phosphoprotein of the pneumovirus pneumonia virus of mice (PVM) has been cloned and sequenced. The gene is 903 nucleotides in length and contains a long open reading frame (ORF) capable of encoding a polypeptide of 295 amino acid residues. A smaller, second, overlapping ORF encoding a polypeptide 137 amino acids in length was also present. The large ORF directed the synthesis of a 39-kDa polypeptide and four additional polypeptides with masses of 37 kDa, 26 kDa, 23 kDa, and 16 kDa in vitro. The smaller polypeptides were generated by internal initiation on in-frame AUG initiation codons to generate carboxy co-terminal products. Western immunoblot analysis indicated that at least two of these proteins and several other related polypeptides are present in infected cells, and the possible origins of these are discussed. Western blot analysis using antiserum raised against a synthetic peptide and specific for the predicted second ORF product identified a polypeptide of 23 kDa in PVM-infected cells. The pattern of PVM P gene expression is unlike that of the closely related respiratory syncytial virus and is reminiscent of that of paramyxoviruses such as Sendai virus. This is the first example of a pneumovirus encoding multiple polypeptide products from a single mRNA in vivo.

Sequence of the phosphoprotein gene of pneumonia virus of mice: expression of multiple proteins from two overlapping reading frames