Lect. 5 Host Pathogen interaction-II
Lect. 5 Host Pathogen interaction-II
Lect. 5 Host Pathogen interaction-II
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RECENT EXAMPLES OF PLANT-PATHOGEN<br />
INTERACTIONS SUPPORTING GUARD HYPOTHESIS<br />
a. Arabidopsis RPM1 is a peripheral plasma membrane NB-<br />
LRR protein. It is activated by either the AvrRpm1 or the<br />
AvrB effector proteins. AvrRpm1 enhances the virulence<br />
of some P. syringae strains on Arabidopsis as does AvrB<br />
on soybeans. AvrRpm1 and AvrB are modified by<br />
eukaryote-specific acylation once delivered into the cell<br />
by the type <strong>II</strong>I secretion system (red syringe) and are thus<br />
targeted to the plasma membrane. The biochemical<br />
functions of AvrRpm1 and AvrB are unknown, although<br />
they target RIN4, which becomes phosphorylated (1P),<br />
and activate RPM1. In the absence of RPM1, AvrRpm1<br />
and AvrB presumably act on RIN4 and other targets to<br />
contribute to virulence. Light blue eggs in this and<br />
subsequent panels represent as yet unknown proteins.
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