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Coding strategy of the S RNA segment of Dugbe virus (Nairovirus; Bunyaviridae)

Coding strategy of the S RNA segment of Dugbe virus (Nairovirus; Bunyaviridae)

Virology 175(2): 518-524

The S RNA segment of Dugbe (DUG) virus (Nairovirus; Bunyaviridae) was sequenced from three overlapping cDNA clones and by primer extension. The S RNA is 1712 nucleotides in length and contains one large open reading frame (ORF) of 1326 nucleotides coding for a 49.4-kDa protein on viral complementary (vc) RNA. This protein in size corresponds to the DUG nucleocapsid (N) protein (P. Cash, 1985, J. Gen. Virol. 66, 141-148). The 49.4-kDa product was expressed as a fusion protein with .beta.-galactosidase in Escherichia coli cells and confirmed as DUG N protein by Western blotting with DUG N-specific monoclonal antibody. An additional ORF of 150 nucleotides coding for a possible 5.9-kDa protein is present in the +1 reading frame, 3' to the N protein ORF on vcRNA. DUG S segment mRNA was found to be essentially full length. No evidence was obtained for the existence of a smaller mRNA species that could code for a 5.9-kDa protein. Comparisons of the DUG S RNA sequence and predicted N protein amino acid sequence, with the respective sequences of snowshoe hare, La Crosse (bunyaviruses), Punta Toro, Sandfly fever Sicilian (phleboviruses), and Hantaan (hantavirus) viruses, failed to detect any sequence similarity, although the genomic structure of DUG S RNA is similar to that of the S RNA segment of Hantaan (HTN) virus.

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Accession: 007128391

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PMID: 2327076

DOI: 10.1016/0042-6822(90)90436-u

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