期刊
RESEARCH IN MICROBIOLOGY
卷 162, 期 5, 页码 488-498出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.resmic.2011.04.010
关键词
Phaseolotoxin; Pseudomonas syringae pv. phaseolicola; Pht cluster; GacS; GacA
类别
资金
- CONACYT
Pseudomonas syringae pv. phaseolicola is the causal agent of halo blight disease of beans (Phaseolus vulgaris L.), which is characterized by watersoaked lesions surrounded by a chlorotic halo resulting from the action of a non-host specific toxin known as phaseolotoxin. This toxin inhibits the enzyme ornithine carbamoyltransferase involved in the arginine biosynthesis pathway. It was previously reported that genes within the Pht cluster were involved in the regulation and synthesis of phaseolotoxin. The GacS/GacA two-component signal transduction system controls important pathogenicity and virulence mechanisms in several Gram-negative bacteria. Tox(-) phenotype gacA(-) and gacS(-) mutants were obtained and gacA(-) transcriptome analysis revealed that this response activator controls expression of genes within the Pht cluster as well as another gene located in a different region in the bacterial chromosome and that has been unambiguously shown to be directly involved in phaseolotoxin biosynthesis. Results presented in this work suggest that phaseolotoxin biosynthesis involve elements within and outside the Pht Cluster, and that the GacS/GacA two-component system exerts control over them. (C) 2011 Institut Pasteur. Published by Elsevier Masson SAS. All rights reserved.
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