Molecular regulation of lysophosphatidic acid receptor 1 trafficking to the cell surface.

Molecular regulation of lysophosphatidic acid receptor 1 trafficking to the cell surface.
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分子调节溶血磷脂酸受体1运输到细胞表面。

DOI:
10.1016/j.cellsig.2014.07.005
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发表时间:
2014-11
影响因子:
4.8
通讯作者:
Zhao Y
Zhao Y
中科院分区:
生物学2区
文献类型:
--
作者:
Zhao J;Wei J;Bowser RK;Dong S;Xiao S;Zhao Y

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溶血磷脂酸受体1(LPA 1)是一种G蛋白偶联受体,调节细胞增殖、迁移和细胞因子释放。在这里,我们调查的LPA 1贩运到细胞表面的分子签名。过表达的具有C-末端V5标签的LPA 1(LPA 1-V5)主要在细胞表面上表达,而两个缺失突变体(C320和Δ84-87)未能被运输到细胞表面。此外,LPA 1的定点突变分析显示,这两个片段内的Ile 325、Tyr 85和Leu 87调节LPA 1成熟和运输到细胞表面。过表达的Sar 1,外壳蛋白复合物II(COPII)的组成部分,增强LPA 1野生型的糖基化,但不是这些突变体。LPA 1的突变体主要定位于内质网(ER)中,并且当与LPA 1野生型相比时,表现出对热休克蛋白70(Hsp 70)更高的结合亲和力。此外,我们发现所有这些突变体都不能增加Erk的磷酸化,以及响应于LPA处理的细胞因子释放。这些结果表明,LPA 1中的Ile 325,Tyr 85和Leu 87是LPA 1蛋白在ER中正确折叠所必需的。
The lysophosphatidic acid receptor 1 (LPA1), a G-protein coupled receptor, regulates cell proliferation, migration, and cytokine release. Here, we investigate the molecular signature of LPA1 trafficking to the cell surface. The overexpressed LPA1 with a C-terminal V5 tag (LPA1-V5) is majorly expressed on the cell surface, while two deletion mutants (C320 and Δ84–87) failed to be trafficked to the cell surface. Further, site-directed mutagenesis analysis of the LPA1 revealed that Ile325, Tyr85, and Leu87 within these two fragments regulate LPA1 maturation and trafficking to the cell surface. Over-expression of Sar1, a component of coat protein complex II (COPII), enhances glycosylation of LPA1 wild type, but not these mutants. The mutants of LPA1 are majorly localized in the endoplasmic reticulum (ER) and exhibit a higher binding affinity to heat shock protein 70 (Hsp70), when compared to the LPA1 wild type. Further, we found that all these mutants failed to increase phosphorylation of Erk, and the cytokine release in response to LPA treatment. These results suggest that Ile325, Tyr85, and Leu87 within LPA1 are essential for LPA1protein properly folding in the ER.
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