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Proteolysis of the barley receptor-like protein kinase RPG1 by a proteasome pathway is correlated with Rpg1-mediated stem rust resistance

Identifieur interne : 000F91 ( Main/Exploration ); précédent : 000F90; suivant : 000F92

Proteolysis of the barley receptor-like protein kinase RPG1 by a proteasome pathway is correlated with Rpg1-mediated stem rust resistance

Auteurs : Jayaveeramuthu Nirmala ; Stephanie Dahl [États-Unis] ; Brian J. Steffenson [États-Unis] ; C. Gamini Kannangara ; Diter Von Wettstein [États-Unis] ; Xianming Chen ; Andris Kleinhofs [États-Unis]

Source :

Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 2007.

RBID : PMC:1891204

Abstract

In plants, disease resistance mediated by the gene-for-gene mechanism involves the recognition of specific effector molecules produced by the pathogen either directly or indirectly by the resistance-gene products. This recognition triggers a series of signals, thereby serving as a molecular switch in regulating defense mechanisms by the plants. To understand the mechanism of action of the barley stem rust resistance gene Rpg1, we investigated the fate of the RPG1 protein in response to infection with the stem rust fungus, Puccinia graminis f. sp. tritici. The investigations revealed that RPG1 disappears to undetectable limits only in the infected tissues in response to avirulent, but not virulent pathotypes. The RPG1 protein disappearance is rapid and appears to be due to specific protein degradation via the proteasome-mediated pathway as indicated by inhibition with the proteasomal inhibitor MG132, but not by other protease inhibitors.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1891204

DOI: 10.1073/pnas.0703758104
PubMed: 17548826
PubMed Central: 1891204

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en"><p>In plants, disease resistance mediated by the gene-for-gene mechanism involves the recognition of specific effector molecules produced by the pathogen either directly or indirectly by the resistance-gene products. This recognition triggers a series of signals, thereby serving as a molecular switch in regulating defense mechanisms by the plants. To understand the mechanism of action of the barley stem rust resistance gene <italic>Rpg1</italic>
, we investigated the fate of the RPG1 protein in response to infection with the stem rust fungus, <italic>Puccinia graminis</italic>
 f. sp. <italic>tritici</italic>
. The investigations revealed that RPG1 disappears to undetectable limits only in the infected tissues in response to avirulent, but not virulent pathotypes. The RPG1 protein disappearance is rapid and appears to be due to specific protein degradation via the proteasome-mediated pathway as indicated by inhibition with the proteasomal inhibitor MG132, but not by other protease inhibitors.</p>
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Proteolysis of the barley receptor-like protein kinase RPG1 by a proteasome pathway is correlated with Rpg1-mediated stem rust resistance

Proteolysis of the barley receptor-like protein kinase RPG1 by a proteasome pathway is correlated with Rpg1-mediated stem rust resistance

Source :

Abstract

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