PMID: 8589416Jul 1, 1995Paper

Role of biosurfactant and ion channel-forming activities of syringomycin in transmembrane ion flux: a model for the mechanism of action in the plant-pathogen interaction

Molecular Plant-microbe Interactions : MPMI
M L HutchisonD C Gross

Abstract

Syringomycin is a necrosis-inducing lipopeptide toxin synthesized and secreted by the phytopathogen, Pseudomonas syringae pv. syringae. Although small quantities of syringomycin are known to activate a cascade of physiological events in plasma membranes, the mechanism of action of the phytotoxin has never been fully characterized. The objective of this study was to test the hypothesis that the primary mode of action of syringomycin is to form transmembrane pores that are permeable to cations. Accordingly, direct measurement of ion fluxes were performed using artificial bilayers. The hemolytic properties and surface activity of HPLC-purified syringomycin were quantified by use of an erythrocyte lysis assay and by the drop weight method. Assays were performed using syringomycin form SRE alone or a mixture containing all forms of the phytotoxin. At a threshold concentration of 500 ng/ml, syringomycin induced hemolysis by forming ion channels in membranes. Osmotic protection studies indicated a channel radius of between 0.6 and 1 nm. The ion channel-forming activity was insensitive and permeable to both monovalent and divalent cations, suggesting that syringomycin causes lysis of erythrocytes by colloid osmotic lysis. In addition, ...Continue Reading

Citations

Dec 13, 2005·Journal of Bioenergetics and Biomembranes·Yuri A KaulinJoseph G Brand
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