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Phosphoproteomics of the Arabidopsis Plasma Membrane and a New Phosphorylation Site Database
Thomas S. Nühsea,
Allan Stensballeb,
Ole N. Jensenb, and
Scott C. Pecka,1
a Sainsbury Laboratory, John Innes Centre, Norwich NR4 7UH, United Kingdom b Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark
1 To whom correspondence should be addressed. E-mail scott.peck{at}sainsbury-laboratory.ac.uk; fax 44-01603-450011.
Abstract:
Functional genomic technologies are generating vast amountsof data describing the presence of transcripts or proteins inplant cells. Together with classical genetics, these approachesbroaden our understanding of the gene products required forspecific responses. Looking to the future, the focus of researchmust shift to the dynamic aspects of biology: molecular mechanismsof function and regulation. Phosphorylation is a key regulatoryfactor in all aspects of plant biology; but it is difficult,if not impossible, for most researchers to identify in vivophosphorylation sites within their proteins of interest. Wehave developed a large-scale strategy for the isolation of phosphopeptidesand identification by mass spectrometry (Nühse et al.,2003b). Here, we describe the identification of more than 300phosphorylation sites from Arabidopsis thaliana plasma membraneproteins. These data will be a valuable resource for many fieldsof plant biology and overcome a major impediment to the elucidationof signal transduction pathways. We present an analysis of thecharacteristics of phosphorylation sites, their conservationamong orthologs and paralogs, and the existence of putativemotifs surrounding the sites. These analyses yield general principlesfor predicting other phosphorylation sites in plants and provideindications of specificity determinants for responsible kinases.In addition, more than 50 sites were mapped on receptor-likekinases and revealed an unexpected complexity of regulation.Finally, the data also provide empirical evidence on the topologyof transmembrane proteins. This information indicates that predictionprograms incorrectly identified the cytosolic portion of theprotein in 25% of the transmembrane proteins found in this study.All data are deposited in a new searchable database for plantphosphorylation sites maintained by PlantsP (http://plantsp.sdsc.edu)that will be updated as the project expands to encompass additionaltissues and organelles.
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