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. 1992 Aug;99(4):1314–1320. doi: 10.1104/pp.99.4.1314

Syringomycin-Stimulated Phosphorylation of the Plasma Membrane H+-ATPase from Red Beet Storage Tissue 1

Yuka S Suzuki 1, Yeelan Wang 1, Jon Y Takemoto 1
PMCID: PMC1080626  PMID: 16669038

Abstract

The syringomycin-stimulated in vitro protein phosphorylation of the plasma membrane H+-ATPase of red beet (Beta vulgaris L.) storage tissue was investigated. Peptides representing the H+-ATPase N and C termini and nucleotide binding site (P-2, P-3, and P-1, respectively) were synthesized, and rabbit antisera against each were produced. In western immunoblots of purified plasma membranes, these antisera immunoreacted with the 100-kilodalton polypeptide of the H+-ATPase and with other smaller polypeptides. The smaller polypeptides appeared to be degraded forms of the intact 100-kilodalton polypeptide. Immunoprecipitation experiments showed that plasma membranes treated with syringomycin had increased protein phosphorylation rates of the 100-kilodalton polypeptide. Optimal phosphorylation levels were achieved with 25 micromolar free Ca2+. Phosphoserine and phosphothreonine were detected in the immunoprecipitates. Washed immunoprecipitates generated with anti-P-1 possessed protein phosphorylation activity. This immunoprecipitate activity was not stimulated by syringomycin, but it was inhibited when plasma membranes were treated with sodium deoxycholate before immunoprecipitation. The findings show that syringomycin stimulates the phosphorylation of the plasma membrane H+-ATPase and that specific protein kinase(s) are probably associated with the enzyme.

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