Structural basis of latrophilin-FLRT interaction.

Structural basis of latrophilin-FLRT interaction.
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DOI:
10.1016/j.str.2015.01.013
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发表时间:
2015-04-07
期刊:
影响因子:
5.7
通讯作者:
Seiradake, Elena
Seiradake, Elena
中科院分区:
生物学2区
文献类型:
--
作者:
Jackson, Verity A.;del Toro, Daniel;Carrasquero, Maria;Roversi, Pietro;Harlos, Karl;Klein, Ruediger;Seiradake, Elena

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中性粒亲和素是蜘蛛毒素α受体,是一种粘附型G蛋白偶联受体,在突触发育中具有新的功能。N-末端区域与内源性细胞黏附分子FlRT结合,Flt是皮质和突触发育的主要调节因子。我们给出了小鼠LatroPhilin3凝集素和类嗅球蛋白(Olf)结构域的结晶学数据,从而揭示了olf的β-螺旋桨折叠和保守的钙结合部位。我们通过序列保守分析、点突变和表面等离子体共振实验相结合的方法定位了Flt-LatroPhilin结合表面。在条带分析中,我们表明野生型LatroPhilin3及其高亲和力相互作用因子Flrt2,而不是我们产生的结合受损的突变体,促进了HeLa细胞的黏附。相反,表达内源性Flt的皮质神经元被野生型LatroPhilin3排斥,而不是被结合受损的突变体排斥。综上所述,我们提供了对LatroPhilin结构的分子水平的见解,它的FLRT结合机制,以及LatroPhilin和FlRT的作用超越了简单的粘连相互作用。LphN-olfactomedin样结构域形成一个五叶片的β推进器,保守的钙结合位点位于蛋白的中心,结合依赖于一个保守的结合位点的突变,抑制LatroPhilin-flt信号的传递。描述了mLPHN3凝集素和类分子(Olf)结构域的晶体结构,揭示了olf的β-螺旋桨折叠和钙结合部位。使用HeLa细胞和皮质神经元的分析显示,OLF及其配体Flt具有双功能作用,导致HeLa细胞黏附和神经元排斥。
Latrophilins, receptors for spider venom α-latrotoxin, are adhesion type G-protein-coupled receptors with emerging functions in synapse development. The N-terminal region binds the endogenous cell adhesion molecule FLRT, a major regulator of cortical and synapse development. We present crystallographic data for the mouse Latrophilin3 lectin and olfactomedin-like (Olf) domains, thereby revealing the Olf β-propeller fold and conserved calcium-binding site. We locate the FLRT-Latrophilin binding surfaces by a combination of sequence conservation analysis, point mutagenesis, and surface plasmon resonance experiments. In stripe assays, we show that wild-type Latrophilin3 and its high-affinity interactor FLRT2, but not the binding-impaired mutants we generated, promote HeLa cell adhesion. In contrast, cortical neurons expressing endogenous FLRTs are repelled by wild-type Latrophilin3 and not by the binding-impaired mutant. Taken together, we present molecular level insights into Latrophilin structure, its FLRT-binding mechanism, and a role for Latrophilin and FLRT that goes beyond a simply adhesive interaction. The LPHN olfactomedin-like domain forms a five-bladed β propeller A conserved calcium-binding site is located at the center of the protein Latrophilin-FLRT binding depends on a conserved binding site Mutations in the binding site inhibit Latrophilin-FLRT signaling Jackson et al. describe a crystal structure of mLPHN3 lectin and olfactomedin-like (Olf) domains, revealing the Olf β-propeller fold and calcium-binding site. Assays using HeLa cells and cortical neurons reveal a bi-functional role for Olf and its ligand FLRT, leading to HeLa cell adhesion and neuron repulsion.
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