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Nucleotide Sequence of the 3'-Terminal Region of Helenium Virus S RNA

G. D. Foster

Department of Mycology and Plant Pathology, The Queen's University of Belfast and Plant Pathology Research Division, Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX, U.K.

The sequence of 1390 nucleotides of the 3'-terminal region of Helenium virus S RNA was determined from cloned cDNA. This portion of the viral RNA contains two major open reading frames (ORFs) encoding proteins of M_r 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 M_r 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.

Present address: University of Leicester, Department of Botany, University Road, Leicester LE1 7RH, U.K.

Received 23 February 1990; accepted 9 April 1990.