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This report describes the complete nucleotide sequence of human reovirus (Dearing strain) genome segment S3. Previous studies indicated that this RNA encodes the major non-structural viral polypeptide sigma NS, a protein that binds ssRNAs (Huisman &amp; Joklik, Virology 70, 411-424, 1976) and has a poly(C)-dependent poly(G) polymerase activity (Gomatos et al., J. Virol. 39, 115-124, 1981). The genome segment consists of 1,198 nucleotides and possesses an open reading frame that extends 366 codons from the first AUG triplet (residues 28-30). There is no significant sequence homology between the plus strand of genome segment S3 and that of genome segment S2 determined previously (Cashdollar et al., PNAS 79, 7644-7648, 1982). However, S3 RNA has significant dyad symmetry and regions that can potentially hybridize (delta G = -26 KCal/mole) with S2 RNA. From the predicted amino acid sequence a possible secondary structure for sigma NS protein was determined. Structural features of reovirus RNA and sigma NS are discussed in relation to their role(s) in viral genome assembly.

Nucleotide sequence of reovirus genome segment S3, encoding non-structural protein sigma NS