The nucleotide sequence of the 3′-proximal 2630 nucleotides of potato virus M (PVM) genomic RNA was determined. The sequenced region contained five long open reading frames (ORFs). The ORF nearest to the 3′-terminal poly(A) tail corresponds to a polypeptide of 10848. This ORF is preceded by one which encodes a protein of 33906 (34K) which has an amino acid sequence that is very similar in its carboxyterminal part to that of the coat proteins of some potexviruses. Three other ORFs encoding polypeptides of 24615, 11893 and 6739 are present in the region 5′ to the 34K protein gene. There is extensive similarity between these proteins and the corresponding proteins encoded by the conserved triple gene block in the RNA of potexviruses.


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