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Related Experiment Video

Updated: Mar 27, 2026

Agroinfiltration and PVX Agroinfection in Potato and Nicotiana benthamiana

Agroinfiltration and PVX Agroinfection in Potato and Nicotiana benthamiana

Published on: January 3, 2014

MAPping the Function of Phytopathogen Effectors.

Christopher J Staiger¹

¹Department of Biological Sciences and The Bindley Bioscience Center, Purdue University, 201 South University Street, West Lafayette, IN 47907-2064, USA.

Cell Host & Microbe

|January 15, 2016

Summary

This summary is machine-generated.

The Pseudomonas syringae bacterium uses its type III secretion system (T3SS) to inject effectors into plants. A key effector, HopE1, targets calmodulin and MAP65-1 to disrupt plant immunity.

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Area of Science:

Plant pathology
Microbial pathogenesis
Molecular plant-microbe interactions

Background:

Pseudomonas syringae is a major plant pathogen.
Type III secretion systems (T3SS) are crucial for bacterial virulence.
T3SS effectors manipulate host processes to promote infection.

Purpose of the Study:

To identify the molecular targets of the T3SS effector HopE1.
To understand how HopE1 contributes to Pseudomonas syringae virulence.
To elucidate the mechanisms by which HopE1 subverts plant immunity.

Main Methods:

Bacterial genetics and mutant analysis
Protein-protein interaction assays (e.g., yeast two-hybrid)
Plant physiological and cellular assays

Main Results:

HopE1 directly interacts with plant calmodulin.
HopE1 targets the microtubule-associated protein MAP65-1.
These interactions lead to the disruption of plant cellular processes and immune responses.

Conclusions:

HopE1 employs a dual targeting strategy involving calmodulin and MAP65-1.
This effector function is critical for Pseudomonas syringae to overcome host defenses.
Understanding HopE1's mechanism provides insights into plant immune evasion strategies.