期刊
NATURE PLANTS
卷 4, 期 6, 页码 345-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41477-018-0150-9
关键词
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资金
- Swiss National Science Foundation [31003A_176237]
- International Research Scholar Award from Howard Hughes Medical Institute
- Swiss National Science Foundation (SNF) [31003A_176237] Funding Source: Swiss National Science Foundation (SNF)
The leucine-rich repeat receptor kinase (LRR-RK) BRASSINOSTEROID INSENSITIVE 1 (BRI1) requires a shape-complementary SOMATIC EMBRYOGENESIS RECEPTOR KINASE (SERK) co-receptor for brassinosteroid sensing and receptor activation. Interface mutations that weaken the interaction between receptor and co-receptor in vitro reduce brassinosteroid signalling responses. The SERK3 elongated (elg) allele maps to the complex interface and shows enhanced brassinosteroid signalling, but surprisingly no tighter binding to the BRI1 ectodomain in vitro. Here, we report that rather than promoting the interaction with BRI1, the elg mutation disrupts the ability of the co-receptor to interact with the ectodomains of BRI1-ASSOCIATED-KINASE1 INTERACTING KINASE (BIR) receptor pseudokinases, negative regulators of LRR-RK signalling. A conserved lateral surface patch in BIR LRR domains is required for targeting SERK co-receptors and the elg allele maps to the core of the complex interface in a 1.25 angstrom BIR3-SERK1 structure. Collectively, our structural, quantitative biochemical and genetic analyses suggest that brassinosteroid signalling complex formation is negatively regulated by BIR receptor ectodomains.
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