Disease-associated mutations prevent GPR56-collagen III interaction.

Disease-associated mutations prevent GPR56-collagen III interaction.
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DOI:
10.1371/journal.pone.0029818
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Piao X
Piao X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Luo R;Jin Z;Deng Y;Strokes N;Piao X

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GPR56 是粘附 G 蛋白偶联受体 (GPCR) 家族的成员。 GPR56 突变会导致一种毁灭性的人类大脑畸形,称为双侧额顶多小脑回 (BFPP)。我们最近利用 GPR56 的 N 端片段(GPR56N)作为探针,证明了 III 型胶原蛋白是发育中大脑中 GPR56 的配体。在本报告中,我们在 GPR56N 中发现了一个新的功能域,即配体结合域。该结构域包含四个与疾病相关的突变和两个 N-糖基化位点。我们的研究表明,虽然配体结合不需要糖基化,但四种疾病相关突变中的每一种都完全废除了 GPR56 的配体结合能力。我们的数据表明,这四个单一错义突变除了如之前所示影响 GPR56 蛋白表面表达外,主要是通过消除 GPR56 与其配体胶原蛋白 III 结合的能力来导致 BFPP。
GPR56 is a member of the adhesion G protein-coupled receptor (GPCR) family. Mutations in GPR56 cause a devastating human brain malformation called bilateral frontoparietal polymicrogyria (BFPP). Using the N-terminal fragment of GPR56 (GPR56N) as a probe, we have recently demonstrated that collagen III is the ligand of GPR56 in the developing brain. In this report, we discover a new functional domain in GPR56N, the ligand binding domain. This domain contains four disease-associated mutations and two N-glycosylation sites. Our study reveals that although glycosylation is not required for ligand binding, each of the four disease-associated mutations completely abolish the ligand binding ability of GPR56. Our data indicates that these four single missense mutations cause BFPP mostly by abolishing the ability of GPR56 to bind to its ligand, collagen III, in addition to affecting GPR56 protein surface expression as previously shown.
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