Direct interaction of resistance gene and avirulence gene products confers rice blast resistance.
EMBO J
; 19(15): 4004-14, 2000 Aug 01.
Article
em En
| MEDLINE
| ID: mdl-10921881
ABSTRACT
Rice expressing the Pi-ta gene is resistant to strains of the rice blast fungus, Magnaporthe grisea, expressing AVR-Pita in a gene-for-gene relationship. Pi-ta encodes a putative cytoplasmic receptor with a centrally localized nucleotide-binding site and leucine-rich domain (LRD) at the C-terminus. AVR-Pita is predicted to encode a metalloprotease with an N-terminal secretory signal and pro-protein sequences. AVR-Pita(176) lacks the secretory and pro-protein sequences. We report here that transient expression of AVR-Pita(176) inside plant cells results in a Pi-ta-dependent resistance response. AVR-Pita(176) protein is shown to bind specifically to the LRD of the Pi-ta protein, both in the yeast two-hybrid system and in an in vitro binding assay. Single amino acid substitutions in the Pi-ta LRD or in the AVR-Pita(176) protease motif that result in loss of resistance in the plant also disrupt the physical interaction, both in yeast and in vitro. These data suggest that the AVR-Pita(176) protein binds directly to the Pi-ta LRD region inside the plant cell to initiate a Pi-ta-mediated defense response.
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Doenças das Plantas
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Proteínas de Plantas
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Oryza
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Genes de Plantas
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Magnaporthe
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Genes Fúngicos
Idioma:
En
Ano de publicação:
2000
Tipo de documento:
Article