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. 1987 Oct;84(19):6755–6759. doi: 10.1073/pnas.84.19.6755

Bacterial phytotoxin, syringomycin, induces a protein kinase-mediated phosphorylation of red beet plasma membrane polypeptides

Ashok P Bidwai 1, Jon Y Takemoto 1,*
PMCID: PMC299163  PMID: 16578820

Abstract

Syringomycin, a peptide toxin and a virulence factor produced by the bacterial phytopathogen Pseudomonas syringae pv. syringae, stimulated the phosphorylation of several plasma membrane polypeptides of red beet storage tissue. Among these was a 100-kDa polypeptide, which corresponds in size to the proton pump ATPase. The phosphorylations were insensitive to hydroxylamine, indicating that the polypeptide phosphorylated intermediates involved phosphate ester bonds characteristic of protein kinase-mediated phosphorylation. Phosphorylation of the 100-kDa polypeptide and of most of the other polypeptides was reduced or eliminated by extraction of the membranes with 0.1% (wt/vol) sodium deoxycholate, a treatment that also eliminated the ability of the toxin to stimulate ATPase activity. Phosphorylation of the 100-kDa polypeptide was highest with 10-20 μg of syringomycin; the same amounts gave the highest degree of ATPase activity stimulation. Phosphorylation of some of the polypeptides was eliminated or decreased by the Ca2+ chelator EGTA. Addition of excess Ca2+ restored the phosphorylation of most of these polypeptides. We conclude that syringomycin acts by stimulating an endogenous membrane protein kinase activity, which results in the phosphorylation of several membrane polypeptides. One of the phosphorylated polypeptides corresponds in size to the proton pump ATPase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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