The complete sequence of the S7 RNA that codes for the major group-specific coat protein, VP7, of African horsesickness virus serotype 4 (AHSV-4) was determined from cDNA analyses and found to be 1179 nucleotides in length. One single open reading frame of 353 codons was observed defining a protein of 38107 with a net charge of -1·5 at neutral pH. Comparison of the AHSV-4 VP7 sequence with that of bluetongue virus serotype 10 revealed an overall similarity of 44%, with the amino- and carboxy-terminal regions exhibiting the greatest levels of homology. In addition, potential secondary structures of the terminal sequences of the S7 RNA segments of AHSV-4 and BTV serotypes 10, 13 and 17 are presented.


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