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Autoacetylation of the Ralstonia solanacearum effector PopP2 targets a lysine residue essential for RRS1-RMediated immunity in Arabidopsis Inra
Tasset, C.; Bernoux, M.; Jauneau, A.; Pouzet, C.; Brière, C.; Kieffer-Jacquinod, S.; RIVAS, S.; Deslandes, L..
Abstract /Type III effector proteins from bacterial pathogens manipulate components of host immunity to suppress defenceresponses and promote pathogen development. In plants, host proteins targeted by some effectors called avirulenceproteins are surveyed by plant disease resistance proteins referred to as ‘‘guards’’. The Ralstonia solanacearum effectorprotein PopP2 triggers immunity in Arabidopsis following its perception by the RRS1-R resistance protein. Here, we showthat PopP2 interacts with RRS1-R in the nucleus of living plant cells. PopP2 belongs to the YopJ-like family of cysteineproteases, which share a conserved catalytic triad that includes a highly conserved cysteine residue. The catalytic cysteinemutant PopP2-C321A is impaired in its avirulence...
Tipo: Journal Article Palavras-chave: PATHOGENE; IMMUNITE; ACTIVITE ENZYMATIQUE; ACETYL-TRANSFERASE PATHOGEN; IMMUNITY; ENZYMATIC ACTIVITY; AUTOACETYLATION.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20111b1e883f&uri=/notices/prodinra1/2011/01/
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Spindle Assembly Checkpoint Protein Dynamics Reveal Conserved and Unsuspected Roles in Plant Cell Division Inra
Caillaud, M.C.; Paganelli, L.; Lecomte, P.; Deslandes, L.; Quentin, M.; Pecrix, Y.; Le Bris, M..
BackgroundIn eukaryotes, the spindle assembly checkpoint (SAC) ensures that chromosomes undergoing mitosis do not segregate until they are properly attached to the microtubules of the spindle.Methodology/Principal FindingsWe investigated the mechanism underlying this surveillance mechanism in plants, by characterising the orthogolous SAC proteins BUBR1, BUB3 and MAD2 from Arabidopsis. We showed that the cell cycle-regulated BUBR1, BUB3.1 and MAD2 proteins interacted physically with each other. Furthermore, BUBR1 and MAD2 interacted specifically at chromocenters. Following SAC activation by global defects in spindle assembly, these three interacting partners localised to unattached kinetochores. In addition, in cases of ‘wait anaphase’, plant SAC proteins...
Tipo: Journal Article Palavras-chave: MICROTUBULE; PROTEINE VEGETALE; DIVISION CELLULAIRE VEGETALE.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011cc4d93e5&uri=/notices/prodinra1/2011/04/
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Transcriptional responses of Arabidopsis thaliana during wilt disease caused by the soil-borne phytopathogenic bacterium, Ralstonia solanacearum Inra
Hu, J.; Barlet, X.; Deslandes, L.; Hirsch, J.; Feng, D.X.; Somssich, I.; Marco, Y..
Bacterial wilt is a common disease that causes severe yield and quality losses in many plants. In the present study, we used the model Ralstonia solanacearum-Arabidopsis thaliana pathosystem to study transcriptional changes associated with wilt disease development. Susceptible Col-5 plants and RRS1-R-containing resistant Nd-1 plants were root-inoculated with R. solanacearum strains harbouring or lacking the matching PopP2 avirulence gene. Gene expression was marginally affected in leaves during the early stages of infection. Major changes in transcript levels took place between 4 and 5 days after pathogen inoculation, at the onset of appearance of wilt symptoms. Up-regulated genes in diseased plants included ABA-, senescence- and basal...
Tipo: Journal Article Palavras-chave: REPONSE HYPERSENSIBLE; MORT CELLULAIRE; FLETRISSEMENT BACTERIEN.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011d2f6d638&uri=/notices/prodinra1/2011/01/
Registros recuperados: 3
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