Nucleic Acids Research, 1988, Vol. 16, No. 21 9917-9932
© 1988
MOLECULAR BIOLOGY |
Nucleotide sequence of beet western yellows virus RNA
Institut de Biologie Moléulaire des Plantes 12 rue de Général Zimmer, 67000 Strasbourg, France 1Station de Pathologie Végétale, INRA Domaine Saint-Maurice, 84140 Montfavet, France 2Institut für Phytopathologie Aschersleben Theodor-Roemer-Weg, Aschersleben 4320, GDR
Received September 30, 1988. Accepted October 10, 1988.
The nucleotide sequence of the genomic RNA (5641 nt) of beet western yellows virus (BWYV) isolated from lettuce has been determined and its genetic organization deduced. The sequence of the 3'terminal 2208 nt of RNA of a second BWYV isolate, obtained from sugarbeet, was also determined and was found to be very similar but not identical to that of the lettuce isolate. The complete sequence of BWYV RNA contains six long open reading frames (ORFs). A cluster of three of these ORFs, including the coat protein cistron, display extensive amino acid sequence homology with corresponding ORFs of a second luteovirus, the PAV isolate of barley yellow dwarf virus (BYDV) (1,2). The ORF corresponding to the putative viral RNA-dependant RNA polymerase, on the other hand, resembles that of southem bean mosaic virus. There is circumstantial evidence that expression of the BWYV RNA polymerase ORF may involve a translational frameshift mechanism. The ORF immediately following the coat protein cisuon may be translated by in-frame readthrough of the coat protein cisnon amber termination codon. Similar mechanisms have been proposed for expression of the corresponding ORFs of BYDV(PAV) (1).
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