期刊
SCIENCE
卷 343, 期 6169, 页码 408-411出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1244454
关键词
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资金
- NSF [MCB-0929395, DGE-1256259]
- U.S. Department of Energy Office of Basic Energy Sciences [DEFG02-88ER13938]
- National Human Genome Research Institute-University of Wisconsin Genomic Sciences Training Program (NIH) [5T32HG002760]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1410164] Funding Source: National Science Foundation
Plant cells are immobile; thus, plant growth and development depend on cell expansion rather than cell migration. The molecular mechanism by which the plasma membrane initiates changes in the cell expansion rate remains elusive. We found that a secreted peptide, RALF (rapid alkalinization factor), suppresses cell elongation of the primary root by activating the cell surface receptor FERONIA in Arabidopsis thaliana. A direct peptide-receptor interaction is supported by specific binding of RALF to FERONIA and reduced binding and insensitivity to RALF-induced growth inhibition in feronia mutants. Phosphoproteome measurements demonstrate that the RALF-FERONIA interaction causes phosphorylation of plasma membrane H+-adenosine triphosphatase 2 at Ser(899), mediating the inhibition of proton transport. The results reveal a molecular mechanism for RALF-induced extracellular alkalinization and a signaling pathway that regulates cell expansion.
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