Repulsive guidance molecule is a structural bridge between neogenin and bone morphogenetic protein.

Repulsive guidance molecule is a structural bridge between neogenin and bone morphogenetic protein.
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DOI:
10.1038/nsmb.3016
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发表时间:
2015-06
影响因子:
16.8
通讯作者:
Siebold, Christian
Siebold, Christian
中科院分区:
生物学1区
文献类型:
--
作者:
Healey, Eleanor G.;Bishop, Benjamin;Elegheert, Jonathan;Bell, Christian H.;Padilla-Parra, Sergi;Siebold, Christian

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排斥性引导分子(RGMs)控制着细胞运动、粘附、免疫细胞调节和全身铁代谢等关键过程。RGMs通过两个基本的信号级联传递信号:再生蛋白(NEO 1)和骨形态发生蛋白(BMP)通路。在这里,我们报告的晶体结构的N-末端结构域的所有人类RGM家族成员的复合物与BMP配体BMP 2,揭示了一种新的蛋白质折叠和保守的BMP结合模式。我们的结构和功能的数据表明,pH值相关的机制,RGM激活BMP信号,并提供了一个合理的RGM突变引起青少年血色素沉着症。我们还确定了三元BMP 2-RGM-NEO 1复合物的晶体结构,结合溶液散射和活细胞超分辨荧光显微镜,表明BMP诱导的RGM-NEO 1复合物的聚集。我们的研究结果显示了RGM如何作为连接BMP和NEO 1的中心枢纽,并在物理上连接这些基本的信号通路。
Repulsive guidance molecules (RGMs) control crucial processes spanning cell motility, adhesion, immune cell regulation and systemic iron metabolism. RGMs signal via two fundamental signaling cascades: the Neogenin (NEO1) and the Bone Morphogenetic Protein (BMP) pathways. Here, we report crystal structures of the N-terminal domains of all human RGM family members in complex with the BMP ligand BMP2, revealing a novel protein fold and a conserved BMP-binding mode. Our structural and functional data suggest a pH-linked mechanism for RGM-activated BMP signaling and offer a rationale for RGM mutations causing juvenile hemochromatosis. We also determined the ternary BMP2–RGM–NEO1 complex crystal structure, which combined with solution scattering and live-cell super-resolution fluorescence microscopy, indicates BMP-induced clustering of the RGM–NEO1 complex. Our results show how RGM acts as the central hub linking BMP and NEO1 and physically connecting these fundamental signaling pathways.
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