Structural and functional studies of the Ras-associating and pleckstrin-homology domains of Grb10 and Grb14.

Structural and functional studies of the Ras-associating and pleckstrin-homology domains of Grb10 and Grb14.
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DOI:
10.1038/nsmb.1642
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发表时间:
2009-08
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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Grb7, Grb10和Grb14是适配器蛋白,包含ras -相关(RA)结构域,pleckstrin-homology (PH)结构域,家族特异性BPS (PH和SH2之间)区域和c端Src-homology-2结构域。先前的结构研究表明,Grb14 BPS区域作为假底物抑制剂结合在胰岛素受体的酪氨酸激酶结构域,抑制胰岛素信号传导。在这里,我们以2.6 Å分辨率报道了Grb10的RA和PH结构域的晶体结构。结构揭示了这两个结构域,以及中间的连接体,形成了一个完整的二聚体结构单元。生化研究表明,Grb14与活化的Ras结合,可能作为胰岛素信号下调的定时机制。我们的研究结果不仅阐明了Grb7-10-14的膜募集机制,还阐明了参与肌动蛋白-细胞骨架重排的MIG-10、rap1相互作用的接合分子、lamellipodin和Pico的膜募集机制,这些蛋白共享一个结构相关的RA-PH串联单元。
Grb7, Grb10 and Grb14 are adapter proteins containing a Ras-associating (RA) domain, a pleckstrin-homology (PH) domain, a family-specific BPS (between PH and SH2) region, and a C-terminal Src-homology-2 domain. Previous structural studies showed that the Grb14 BPS region binds as a pseudosubstrate inhibitor in the tyrosine kinase domain of the insulin receptor to suppress insulin signaling. Here, we report the crystal structure of the RA and PH domains of Grb10 at 2.6 Å resolution. The structure reveals that these two domains, along with the intervening linker, form an integrated, dimeric structural unit. Biochemical studies demonstrated that Grb14 binds to activated Ras, which may serve as a timing mechanism for downregulation of insulin signaling. Our results illuminate not only membrane-recruitment mechanisms in Grb7-10-14, but also in MIG-10, Rap1-interacting adapter molecule, lamellipodin and Pico, proteins involved in actin-cytoskeleton rearrangement which share a structurally related RA-PH tandem unit.
DOI: 10.1016/s1097-2765(03)00487-8
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影响因子: 16
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通讯作者: Hubbard, SR
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期刊: DEVELOPMENTAL CELL
影响因子: 11.8
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