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We cloned and determined the nucleotide sequences of cDNAs against genomic RNA encoding the L protein of human parainfluenza type 2 virus (PIV-2). The L gene is 6904 nucleotides long including the intergenic region at the HN-L junction and putative negative strand leader RNA, almost all of which is complementary to the positive strand leader RNA of PIV-2. The deduced L protein contains 2262 amino acids with a calculated molecular weight of 256,366. The L protein of PIV-2 shows 39.9, 28.9, 27.8 and 28.3% homologies with Newcastle disease virus (NDV), Sendai virus (SV), parainfluenza type 3 virus (PIV-3) and measles virus (MV), respectively. Although sequence data on other components of transcriptive complex, NP and P, suggested a closer relationship between PIV-2 and MV, as concerns the L protein, MV is closely related to another group as SV and PIV-3. From analysis of the alignment of the five l proteins, six blocks composed of conserved amino acids were found in the L proteins. The L protein of PIV-2 was detected in purified virions and virus-infected cells using antiserum directed against an oligopeptide corresponding to the amino terminal region. Primer extension analyses showed that the intergenic regions at the NP-P, P-M, M-F, F-HN and HN-L junctions are 4, 45, 28, 8 and 42 nucleotides long, respectively, indicating that the intergenic regions exhibit no conservation of length and sequence. Furthermore, the starting and ending sequences of paramyxoviruses were summarized.

Characterizations of the human parainfluenza type 2 virus gene encoding the L protein and the intergenic sequences