The Nucleotide Sequence and Genome Organization of Sclerophthora macrospora Virus B

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 wa...

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Bibliographic Details
Published in:Virology (New York, N.Y.) N.Y.), 1999-11, Vol.264 (2), p.344-349
Main Authors: Yokoi, Toshiro, Takemoto, Yutaka, Suzuki, Masashi, Yamashita, Shuichi, Hibi, Tadaaki
Format: Article
Language:English
Subjects:
Amino Acid Sequence
amino acid sequences
Base Sequence
Capsid - genetics
DNA, Viral - analysis
genbank/ab012756
Genome, Viral
Molecular Sequence Data
Oomycetes - virology
Open Reading Frames
plant pathogenic fungi
RNA Viruses - genetics
Sclerophthora macrospora
Sclerophthora macrospora virus B
Sequence Analysis, DNA
Sequence Homology, Amino Acid
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Summary: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.
ISSN:0042-6822
1096-0341
DOI:10.1006/viro.1999.0018