The sequence of 1390 nucleotides of the 3′-terminal region of virus S RNA was determined from cloned cDNA. This portion of the viral RNA contains two major open reading frames (ORFs) encoding proteins of 32.9K and 12.6K. The 32.9K protein, which is similar in size to the capsid protein of the virus, shares marked homology with the coat proteins of potexviruses and two other carlaviruses. The ORF, corresponding to 12.6K, nearest to the 3′-terminal poly(A) tail shows extensive similarity with the corresponding proteins of potato virus S and potato virus M. We propose that this protein may be involved in nucleic acid binding within infected cells.


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