Abstract
The complete sequence of the reovirus (serotype 3) S1 gene was obtained by using cloned cDNA derived from the RNA segment. This gene is 1416 nucleotides in length and contains two open reading frames. The first reading frame has a coding capacity of 455 amino acids, sufficient to account for the known S1 product, protein sigma 1 (42,000 MW). It possesses a signal peptide as well as three possible glycosylation sites. No homology could be detected when this gene sequence and the deduced amino acid sequence were compared to published sequences of the corresponding gene of a human rotavirus. The second reading frame (not in phase with the first) starts at the second ATG recently shown to be a functional initiation site. It has a coding capacity of 120 amino acids. Its outstanding feature is the highly basic amino-terminal region, a characteristic apparently shared by a number of DNA binding proteins. It is speculated that this protein, hitherto undetected, may play a role in mediating viral and/or host nucleic acid transcription.
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