title: The nucleotide sequence and genome organization of Sclerophthora macrospora virus B.
abstract: Sclerophthora macrospora Virus B (SmV B) found in S. macrospora, the pathogenic fungus responsible for downy mildew in gramineous plants, is a small icosahedral, monopartite virus containing a positive-strand ssRNA genome. In the present study, the complete nucleotide sequence of the SmV B genome was determined. The viral genome consists of 5533 nucleotides and has two large open reading frames (ORFs). ORF1 encodes a putative polyprotein containing the motifs of chymotrypsin-related serine protease and RNA-directed RNA polymerase. ORF2 encodes a capsid protein. The deduced amino acid sequence shows some similarity to those of certain positive-strand RNA viruses, but the genome organization is characteristic and distinct from those of other known fungal RNA viruses. These results suggest that SmV B should be classified into a new group of mycoviruses.
authors.affiliation: Department of Agricultural Biology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo, 113-8657, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yokoi
authors.forename: Y
authors.initials: Y
authors.lastname: Takemoto
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Yamashita
authors.forename: T
authors.initials: T
authors.lastname: Hibi
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002213:Capsid / Q000235:genetics; D004279:DNA, Viral / Q000032:analysis*; D016679:Genome, Viral; D008969:Molecular Sequence Data; D009868:Oomycetes / Q000821:virology; D016366:Open Reading Frames; D012328:RNA Viruses / Q000235:genetics*; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: D004279:DNA, Viral