Article ; Online: Isolation and Characterization of Plant Metabolite Signals that Induce Type III Secretion by the Plant Pathogen Pseudomonas syringae.
Methods in molecular biology (Clifton, N.J.)
2019 Volume 1991, Page(s) 115–126
Abstract: Pseudomonas syringae is a bacterium that can cause disease on a wide range of plant species including important agricultural crops. A primary virulence mechanism used by P. syringae to infect host plants is the type III secretion system (T3SS), a syringe- ...
Abstract | Pseudomonas syringae is a bacterium that can cause disease on a wide range of plant species including important agricultural crops. A primary virulence mechanism used by P. syringae to infect host plants is the type III secretion system (T3SS), a syringe-like structure that delivers defense-suppressing proteins directly into plant cells. Genes encoding the T3SS are not transcribed in P. syringae prior to contact with a potential host plant and must be expressed during initial stages of infection. Specific organic and amino acids exuded by plants were recently identified as signals that can induce expression of T3SS-associated genes. Here we describe a technique to produce exudates from intact Arabidopsis seedlings and evaluate the exudates for the presence of these bioactive metabolites. We provide procedures for exudate production as well as downstream assays to assess T3SS gene expression using a GFP transcriptional reporter. We also describe methods for preparing high-quality protein and RNA from exudate-treated bacteria to directly assess changes in mRNA and protein abundance. These methods could be used to investigate mechanisms regulating P. syringae perception of plant metabolites as well as the release of these substances by the plant, and more generally to investigate host signals perceived by other phytopathogens. |
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MeSH term(s) | Amino Acids/pharmacology ; Arabidopsis/growth & development ; Arabidopsis/metabolism ; Arabidopsis/microbiology ; Bacterial Proteins/drug effects ; Bacterial Proteins/metabolism ; Gene Expression Regulation, Bacterial/drug effects ; Plant Diseases/microbiology ; Pseudomonas syringae/physiology ; Type III Secretion Systems/drug effects ; Type III Secretion Systems/metabolism |
Chemical Substances | Amino Acids ; Bacterial Proteins ; Type III Secretion Systems |
Language | English |
Publishing date | 2019-04-30 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. |
ISSN | 1940-6029 |
ISSN (online) | 1940-6029 |
DOI | 10.1007/978-1-4939-9458-8_13 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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