The Plant Cell, Vol. 13, 1467-1475,
June 2001, Copyright © 2001,
American Society of Plant Physiologists
Directed Proteomics Identifies a Plant-Specific Protein Rapidly Phosphorylated in Response to Bacterial and Fungal Elicitors
Scott C. Peck13,
Thomas S. Nühse,
Daniel Hess,
Alejandro Iglesias2,
Fred Meins and
Thomas Boller
Friedrich Miescher Institute, P.O. Box 2543, CH-4002 Basel, Switzerland
3 To whom correspondence should be addressed. E-mail scott.peck{at}bbsrc.ac.uk; fax 44-01603-450011
The perception of microbial signal molecules is part of the strategy evolved by plants to survive attacks by potential pathogens. To gain a more complete understanding of the early signaling events involved in these responses, we used radioactive orthophosphate to pulse-label suspension-cultured cells of Arabidopsis in conjunction with two-dimensional gel electrophoresis and mass spectrometry to identify proteins that are phosphorylated rapidly in response to bacterial and fungal elicitors. One of these proteins, AtPhos43, and related proteins in tomato and rice, are phosphorylated within minutes after treatment with flagellin or chitin fragments. By measuring 32P incorporation into AtPhos43 immunoprecipitated from extracts of elicitor-treated hormone and defense-response mutants, we found that phosphorylation of AtPhos43 after flagellin treatment but not chitin treatment is dependent on FLS2, a receptor-like kinase involved in flagellin perception. Induction by both elicitors is not dependent on salicylic acid or EDS1, a putative lipase involved in defense signaling.
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