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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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Characterisation of sunflower root colonisation by Phoma macdonaldii Inra
Al Fadil, T.A.; Jauneau, A.; Martinez, M.Y.; Rickauer, M.; Dechamp-Guillaume, G..
Phoma macdonaldii, the causal agent of black stem disease of sunflower (Helianthus annuus),also attacks roots and collars of the plants, resulting in early death. Totally resistant lines do not exist for infection of the aerial parts, but tolerant lines have been characterised. This paper presents a study on colonisation of a partially resistant and a susceptible sunflower line by P. macdonaldii. The fungus was transformed with a constitutively expressed reporter gene encoding the jellyfish green fluorescent protein via Agrobacterium tumefaciens, and colonisation of sunflower roots by this transformed strain was studied by various microscopy techniques including confocaland scanning electron microscopy. The results show that penetration of the fungus into...
Tipo: Journal Article Palavras-chave: BLACK STEM DISEASE; GREEN FLUORESCENT PROTEIN; LEPTOSPHAERIA LINDQUISTII.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009ed04caf0&uri=/notices/prodinra1/2010/08/
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