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Tractable Mammalian Cell Infections with Protozoan-primed Bacteria

Tractable Mammalian Cell Infections with Protozoan-primed Bacteria

Published on: April 2, 2013

A pathogen-exclusive nutrition niche.

Jinping Zhao¹, Yanxia Ding¹, Junqi Song²

¹Texas A&M AgriLife Research Center at Dallas, Texas A&M University System, Dallas, TX 75252, USA.

Trends in Plant Science

|May 16, 2026

Summary

Xanthomonas bacteria create a unique nutrient source called xanthosan from host sugars using the AvrBs2 effector. This strategy enhances pathogen growth and offers new targets for controlling plant diseases.

Keywords:

AvrBs2 nutrient niche plant–pathogen interaction xanthosan

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Area of Science:

Plant Pathology
Microbial Metabolism
Molecular Biology

Background:

Xanthomonas species are significant plant pathogens.
Understanding pathogen nutrient acquisition is crucial for disease control.

Purpose of the Study:

To elucidate the mechanism by which Xanthomonas exploits host carbohydrates.
To identify key effectors and metabolic pathways involved in pathogen virulence.

Main Methods:

Investigated the role of the conserved effector AvrBs2.
Analyzed the enzymatic activity of AvrBs2 in catalyzing UDP-α- D-galactose.
Studied the utilization of xanthosan by Xanthomonas via XanT and XanP transporters.

Main Results:

The effector AvrBs2 catalyzes UDP-α- D-galactose into xanthosan.
Xanthomonas exclusively consumes xanthosan using the XanT and XanP transporters.
This metabolic pathway creates a 'nutrition niche' for the pathogen.

Conclusions:

Xanthomonas utilizes a specialized pathway to acquire carbon and enhance virulence.
The AvrBs2-mediated xanthosan production represents a novel virulence mechanism.
Targeting the xanthosan pathway offers potential for sustainable disease management strategies.