title: [Detection of cucumber mosaic virus subgroup II isolate from tobacco plants in Yunnan province].
abstract: One of the spherical virus(designated as CMV-YNb) was isolated form the tobacco plants in Yunnan province. SDS-PAGE showed that this virus contained one polypeptide with molecular weights of 55 kD. The polypeptide was submitted to automated Edman degradation, and found the 10 amino acid sequence of the N-terminus of 55 kD protein shares 100% identity with amino acid sequence of coat protein of CMV-Q, which is belong to CMV Subgroup II. Western blot analysis also showed that this 55 kD protein was serological related to CMV-Q. A 0.9 kb cDNA fragment was amplified by RT-PCR from the RNA template of CMV-YNb with the QCf/QCr primer pair, which was designed according to the CP gene sequence of CMV-Q. The cDNA fragment was then cloned and sequenced. The fragment comprises 865 bp (EMBL accession number: AJ242585), including a 197 bp of 5' intergenic region, 657 bp of CP gene encoding 158 amino acids and a 11 bp of 3' partial non-coding region. Comparison of the nucleotide and amino acid sequences of CMV-YNb CP gene with that of CMV strains belonging to Subgroup II, and that of CMV strains belonging to subgroup I showed 97%-98% and 96%-99%, 75%-76% and 78%-79% identities, respectively. With these data, we made a conclusion that the CMV-YNb is an isolate of CMV Subgroup II.
authors.affiliation: Institute of Biotechnology, Zhejiang University, Hangzhou 310029.
authors.forename: F
authors.initials: F
authors.lastname: Li
authors.forename: X
authors.initials: X
authors.lastname: Zhou
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Qi
authors.forename: D
authors.initials: D
authors.lastname: Li
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002681:China; D017799:Cucumovirus / Q000235:genetics* / Q000302:isolation & purification; D008969:Molecular Sequence Data; D012367:RNA, Viral / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D014026:Nicotiana / Q000821:virology*; D014764:Viral Proteins / Q000737:chemistry*
chemical_list: D012367:RNA, Viral; D014764:Viral Proteins