HopW1 from Pseudomonas syringae Disrupts the Actin Cytoskeleton to Promote Virulence in Arabidopsis

PLoS Pathogens

David R. Kovar¹  Yongsung Kang¹  Joanna Jelenska¹  Nicolas M. Cecchini¹  Yujie Li¹  Jean T. Greenberg¹  Min Woo Lee¹ 

[1] Department of Molecular Genetics and Cell Biology, The University of Chicago, Chicago, Illinois, United States of America

关键词: Actins;    Arabidopsis thaliana;    Cytoskeleton;    Cell disruption;    Plant bacterial pathogens;    Endocytosis;    Actin filaments;    Pseudomonas syringae;   

DOI  :  10.1371/journal.ppat.1004232

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

A central mechanism of virulence of extracellular bacterial pathogens is the injection into host cells of effector proteins that modify host cellular functions. HopW1 is an effector injected by the type III secretion system that increases the growth of the plant pathogen Pseudomonas syringae on the Columbia accession of Arabidopsis. When delivered by P. syringae into plant cells, HopW1 causes a reduction in the filamentous actin (F-actin) network and the inhibition of endocytosis, a known actin-dependent process. When directly produced in plants, HopW1 forms complexes with actin, disrupts the actin cytoskeleton and inhibits endocytosis as well as the trafficking of certain proteins to vacuoles. The C-terminal region of HopW1 can reduce the length of actin filaments and therefore solubilize F-actin in vitro. Thus, HopW1 acts by disrupting the actin cytoskeleton and the cell biological processes that depend on actin, which in turn are needed for restricting P. syringae growth in Arabidopsis.

【 授权许可】

CC BY