The nucleotide sequence of the coat protein gene of the yellowing (Y) strain of soybean dwarf virus (SbDV) was determined from cloned cDNA. The gene contains 600 nucleotides and encodes a protein of 200 amino acids with a calculated M(r) of 22,200. The identity of the open reading frame (ORF) encoding the coat protein was confirmed by expression of an Escherichia coli beta-galactosidase fusion protein and detection by a dot blot immunoassay. Sequence comparisons of the deduced coat protein amino acids to several luteoviruses demonstrated that the SbDV-Y coat protein ORF shares greatest similarity with bean leaf roll virus (BLRV) (65%).
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