A J domain virulence effector of Pseudomonas syringae remodels host chloroplasts and suppresses defenses.

ABSTRACT:

Background

The plant pathogen Pseudomonas syringae injects 20-40 different proteins called effectors into host plant cells, yet the functions and sites of action of these effectors in promoting pathogenesis are largely unknown. Plants in turn defend themselves against P. syringae by activating the salicylic acid (SA)-mediated signaling pathway. The P. syringae-specific HopI1 effector has a putative chloroplast-targeting sequence and a J domain. J domains function by activating 70 kDa heat-shock proteins (Hsp70).

Results

HopI1 is a ubiquitous P. syringae virulence effector that acts inside plant cells. When expressed in plants, HopI1 localizes to chloroplasts, the site of SA synthesis. HopI1 causes chloroplast thylakoid structure remodeling and suppresses SA accumulation. Hop

SUBMITTER: Jelenska J 

PROVIDER: S-EPMC1857343 | biostudies-literature | 2007 Mar

REPOSITORIES: biostudies-literature