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The nucleotide sequence of the P gene of human parainfluenza virus type 1 (PIV1) was determined from cloned cDNA copies of the mRNA. By analogy with the gene organization of Sendai virus, two open reading frames in the mRNA sense of the gene were identified as coding sequences for the P protein (568 amino acids with an estimated molecular weight of 64,655) and the C protein (204 amino acids with an estimated molecular weight of 24,108). Comparison of the deduced amino acid sequences of the P and C proteins of PIV1 with those of Sendai virus showed a high degree of homology. However, a sequence for the cysteine-rich V protein, which was considered a common feature of other paramyxoviruses, was interrupted by the presence of multiple stop codons. The sequence analysis of three P-gene-specific cDNA clones generated from genomic RNA by polymerase chain reaction and one additional clone generated from mRNA confirmed that the coding sequence for the cysteine-rich region is silent in the PIV1 gene and thus is not translated into protein. Two potential editing sites with the consensus sequence 3'UUYUCCC were found in the PIV1 P gene at positions 564 to 570 and 1430 to 1436. However, examination of the PIV1 mRNA population by a primer extension method indicated that neither of these sites is utilized. These results indicate that the PIV1 P gene has a coding strategy different from those of other paramyxovirus P genes.

The P gene of human parainfluenza virus type 1 encodes P and C proteins but not a cysteine-rich V protein