期刊
SCIENCE
卷 321, 期 5888, 页码 557-560出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1156973
关键词
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资金
- NCRR NIH HHS [RR01614, RR019934, RR012961] Funding Source: Medline
- NIGMS NIH HHS [R01 GM066258-07, R01 GM066258, R01GM066258] Funding Source: Medline
Brassinosteroids ( BRs) bind to the extracellular domain of the receptor kinase BRI1 to activate a signal transduction cascade that regulates nuclear gene expression and plant development. Many components of the BR signaling pathway have been identified and studied in detail. However, the substrate of BRI1 kinase that transduces the signal to downstream components remains unknown. Proteomic studies of plasma membrane proteins lead to the identification of three homologous BR- signaling kinases ( BSK1, BSK2, and BSK3). The BSKs are phosphorylated by BRI1 in vitro and interact with BRI1 in vivo. Genetic and transgenic studies demonstrate that the BSKs represent a small family of kinases that activate BR signaling downstream of BRI1. These results demonstrate that BSKs are the substrates of BRI1 kinase that activate downstream BR signal transduction.
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