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1 Section de virologie, Faculté de médecine vétérinaire, Université de Montréal, C. P. 5000, St-Hyacinthe, Québec, J2S 7C6
and2 Centre de recherche en virologie, Institut Armand-Frappier, C. P. 100, Laval, Québec, H7N 4Z3, Canada
The S1 genome segment of avian reovirus strain S1133 was cloned and completely sequenced. The sequence comprised 1636 bp with three distinct open reading frames (ORFs), suggesting the gene was polycistronic in nature. The three ORFs from 5' to 3' were predicted to encode polypeptides of 9.8, 3.8 and 34.9 kDa, respectively. Of the three ORFs, only the third possessed the AUG initiation codon in an optimum context for translation. The third ORF-encoded protein, 326 amino acids in length, was expressed in Escherichia coli and used as antigen in immunoblots. The protein was concluded to be 
3 on the basis of its recognition by a chicken anti-reovirus antiserum and due to the fact that a mouse antiserum raised against it recognized specifically the viral 3 polypeptide. Sequence comparison of the avian reovirus S1 gene with its mammalian counter-part did not show any significant similarity between the two. However, amino acid sequence analysis and the predicted existence of a heptapeptide repeat pattern, as well as the relatively high frequency of 
-helix structures in the amino terminal portion of 3 suggests that this protein is structurally, and probably functionally, related to mammalian reovirus 1 protein.
* Author for correspondence. Fax +1 514 778 8113. e-mail silim@ere.umontreal.ca
Received 28 November 1994;
accepted 3 February 1995.
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