title: Coat protein sequence of a resistance-breaking strain of potato virus X isolated in Argentina.
abstract: The PVX coat protein (CP) is involved in many aspects of plant-virus interaction (virion morphology, plant symptoms, viral pathogenesis and virulence, and genomic RNA accumulation). Different virus strains have been distinguished according to their compatibility with the host resistance genes Nx, Nb, and Rx. Substitution of the Thr 122 on the CP with a Lys in PVX strain HB has been shown to affect the response of potato cultivars with the Rx resistance gene. In PVX DX the avirulence determinant for the Nx gene has been localized in the Gln 78 of the coat. PVX strain MS, like PVX HB, is able to overcome the Rx, Nx, and Nb genes. Sequencing of the CP gene of PVX MS (EMBL accession number Z34261) shows that it has a Thr in codon 122 and a Gln in codon 78. These results suggest that, in addition to the coat protein gene, other regions of the viral genome are involved in the pathogenicity.
authors.affiliation: Instituto de Biología Molecular, CICV, INTA Castelar, Morón, Argentina.
authors.forename: D A
authors.initials: DA
authors.lastname: Feigelstock
authors.forename: A C
authors.initials: AC
authors.lastname: Tozzini
authors.forename: H E
authors.initials: HE
authors.lastname: Hopp
mesh_terms: D000595:Amino Acid Sequence; D001118:Argentina; D001483:Base Sequence; D002213:Capsid / Q000235:genetics*; D036022:Capsid Proteins; D008969:Molecular Sequence Data; D017863:Potexvirus / Q000235:genetics* / Q000302:isolation & purification / Q000472:pathogenicity; D017386:Sequence Homology, Amino Acid; D011198:Solanum tuberosum / Q000821:virology
chemical_list: D036022:Capsid Proteins; C058750:coat protein, Potato virus X