How does cyclic-di-GMP regulate biosynthesis of a key P. syringae phytotoxin? (MALONE_J19DTP)
- Research Area Agriculture and Food Security
- Partner The John Innes Centre (JIC)
Dr Jacob Malone -
- Application Deadline 26/11/2018
Pseudomonas syringae is a widespread plant pathogen responsible for yield losses in crops worldwide. The phytotoxin coronatine (COR) is produced by several P. syringae pathovars and plays an important role in initiating plant infections. COR suppresses plant immunity, inhibits the closure of stomata, and induces chlorosis (yellowing) of infected tissues. We recently showed that the widespread bacterial signalling molecule cyclic-di-GMP (cdG) binds to three enzymes of the COR biosynthesis pathway. This finding implicates cdG in COR regulation and in the control of P. syringae plant infection.
In this project, we will use a combination of genetics, biochemistry and structural biology to define how cdG-binding controls COR biosynthesis in P. syringae. The student will first conduct an in-depth biochemical analysis of cdG-binding to the COR-biosynthetic enzymes. The relationship between cdG and regulation of each enzyme will be further refined through structural characterization by X-ray crystallography. In parallel, we will use genetics, molecular biology and plant infection experiments to determine the physiological relevance of cdG-binding to COR biosynthesis, and its impact on P. syringae virulence in planta.
The student will be hosted at the internationally recognised John Innes Centre, which will provide cutting-edge research facilities and a stimulating research and training environment. They will be part of an interdisciplinary, collaborative research team and will gain excellent training in molecular microbiology, and genetics, as well as advanced biochemical and structural biology techniques. The combination of transferable, technical skills associated with the project will make the successful candidate highly employable, in industry or academia.