Structure of the tandem fibronectin type 3 domains of neural cell adhesion molecule.

Structure of the tandem fibronectin type 3 domains of neural cell adhesion molecule.
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DOI:
10.1016/j.jmb.2008.01.030
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发表时间:
2008-03-21
影响因子:
5.6
通讯作者:
Hohenester, Erhard
Hohenester, Erhard
中科院分区:
生物学2区
文献类型:
--
作者:
Carafoli, Federico;Saffell, Jane L.;Hohenester, Erhard

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神经细胞黏附分子(NCAM)激活成纤维细胞生长因子受体(FGFR)是NCAM介导的神经突起生长所必需的。先前的肽研究已经发现,NCAM的纤维连接蛋白3型(FN3)样结构域中的两个区域对这些活动是重要的。在这里,我们报告了NCAM FN3结构域串联的晶体结构,揭示了一种急剧弯曲的结构域排列。一个非保守的表面残基(M610R)的突变导致了第二种晶型显示出本质上不同的构象。因此,FN3结构域连接子是高度灵活的,表明它对应于NCAM电子显微镜中看到的铰链。两个可能的FGFR1结合片段,每个NCAM FN3结构域一个,位于结构域界面附近。它们在弯曲更严重的构象中形成一个连续的斑块,但在FN3串联拉直后分离,这表明NCAM中的构象变化可能调节FGFR1的激活。表面等离子体共振实验表明,NCAMFN3串联蛋白与哺乳动物细胞中表达的可溶性FGFR1蛋白之间只有很弱的相互作用(解离常数约为100μM)。因此,NCAM-FGFR1在细胞表面的相互作用可能取决于由于受体聚集而产生的亲和力效应。
Activation of the fibroblast growth factor receptor (FGFR) by neural cell adhesion molecule (NCAM) is essential for NCAM-mediated neurite outgrowth. Previous peptide studies have identified two regions in the fibronectin type 3 (FN3)-like domains of NCAM as being important for these activities. Here we report the crystal structure of the NCAM FN3 domain tandem, which reveals an acutely bent domain arrangement. Mutation of a non-conserved surface residue (M610R) led to a second crystal form showing a substantially different conformation. Thus, the FN3 domain linker is highly flexible, suggesting that it corresponds to the hinge seen in electron micrographs of NCAM. The two putative FGFR1-binding segments, one in each NCAM FN3 domain, are situated close to the domain interface. They form a contiguous patch in the more severely bent conformation but become separated upon straightening of the FN3 tandem, suggesting that conformational changes within NCAM may modulate FGFR1 activation. Surface plasmon resonance experiments demonstrated only a very weak interaction between the NCAM FN3 tandem and soluble FGFR1 proteins expressed in mammalian cells (dissociation constant > 100 μM). Thus, the NCAM–FGFR1 interaction at the cell surface is likely to depend upon avidity effects due to receptor clustering.
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