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Bluetongue virus (BTV) induces the synthesis of at least ten proteins, three of which are nonstructural. One of the nonstructura] proteins, NS1, which in BTV-17 is coded for by genome segment 6, forms tubular structures in infected cells. Five overlapping clones containing cDNA from BTV-17 were selected by dot blot hybridization from a pUC18 library and confirmed to be derived from segment 6 by Northern blot analysis. Their nucleotide sequence was determined by the dideoxy chain termination method (1). The sequence of the 3' end of the gene was determined by direct RNA sequencing with oligonucleotide primers (2). The gene consists of 1769 nucleotides with a single long open reading frame coding for a protein of 552 amino acids with a molecular weight of 64,542. Comparison of the nucleotide sequence of this gene to the genes coding for this protein from BTV-10 North America (3), BTV-1 South Africa and Australia (4) reveals a homology of 99%, 89% and 79%, respectively. Comparison of these genes at the amino acid level reveals the same pattern of homology as at the nucleic acid.

Nucleotide and deduced amino acid sequence of the nonstructural protein, NS1, of the US bluetongue virus serotype 17