Evading plant immunity: feedback control of the T3SS in Pseudomonas syringae.
File(s)
Accepted version
Published version
Author(s)
Waite, C
Schumacher, J
Jovanovic, M
Bennett, M
Buck, M
Type
Journal Article
Abstract
Microbes are responsible for over 10% of the global yield losses in staple crops such as wheat, rice, and maize. Understanding the decision-making strategies that enable bacterial plant pathogens to evade the host immune system and cause disease is essential for managing their ever growing threat to food security. Many utilise the needle-like type III secretion system (T3SS) to suppress plant immunity, by injecting effector proteins that inhibit eukaryotic signalling pathways into the host cell cytoplasm. Plants can in turn evolve resistance to specific pathogens via recognition and blocking of the T3SS effectors, so leading to an ongoing co-evolutionary 'arms race' between pathogen and host pairs. The extracytoplasmic function sigma factor HrpL co-ordinates the expression of the T3SS regulon in the leaf-dwelling Pseudomonas syringae and similar pathogens. Recently, we showed that association of HrpL with a target promoter directly adjacent to the hrpL gene imposes negative autogenous control on its own expression level due to overlapping regulatory elements. Our results suggest that by down-regulating T3SS function, this fine-tuning mechanism enables P. syringae to minimise effector-mediated elicitation of plant immunity.
Date Issued
2017-03-17
Date Acceptance
2017-03-03
Citation
Microbial Cell, 2017, 4 (4), pp.137-139
ISSN
2311-2638
Publisher
Shared Science Publishers
Start Page
137
End Page
139
Journal / Book Title
Microbial Cell
Volume
4
Issue
4
Copyright Statement
© 2017 Waite et al. This is an open-access article released
under the terms of the Creative Commons Attribution (CC
BY) license, which allows the unrestricted use, distribution,
and reproduction in any medium, provided the original
author and source are acknowledged.
under the terms of the Creative Commons Attribution (CC
BY) license, which allows the unrestricted use, distribution,
and reproduction in any medium, provided the original
author and source are acknowledged.
License URL
Sponsor
Biotechnology and Biological Sciences Research Council (BBSRC)
The Leverhulme Trust
Biotechnology and Biological Sciences Research Council (BBSRC)
Biotechnology and Biological Sciences Research Council (BBSRC)
Identifier
PII: MIC0177E118
Grant Number
G19187
F/07 058/BM
BB/H012249/1
BB/N02539/1
Subjects
HrpL
T3SS
feedback control
gene regulation
pathogen
plants
syringae
Publication Status
Published