对于β-阿雷斯的受体决定者 功能特异性在C-X-C 化学受体5
Joseph M Crecelius1, Aaren R Manz1, Sara Benzow1
1Department of Biochemistry, Medical College of Wisconsin, Milwaukee, Wisconsin.
β-阿雷斯被招募到C-X-C基因化学因子受体5 (CXCR5) 中,对其无敏化至关重要. 然而,这些蛋白质对于CXCR5的内部化或信号传递是不必要的,突出显示了不同功能的不同受体决定因素.
科学领域:
- 细胞生物学 细胞生物学
- 分子药理学分子药理学
- 免疫学 免疫学 免疫学
背景情况:
- β-arrestins是G蛋白合受体 (GPCR) 调节中的关键适配体,调解脱敏化,内化和信号传递.
- 控制这些不同的β-止素功能的受体特异性决定因素尚不清楚.
- 在免疫和疾病中,C-X-C动机化学因子受体5 (CXCR5) 和它的配体C-X-C动机化学因子配体13 (CXCL13) 起作用,但CXCR5信号调节尚不清楚.
研究的目的:
- 为了确定控制CXCR5.5的β-阿雷斯介导调节的受体决定因素.
- 阐明β-arrestins在CXCR5脱敏,内化和信号传递中的特定作用.
- 要了解离散的受体元素如何决定不同的β-止素功能.
主要方法:
- 生物发光共振能量转移 (BRET) 用于测量beta-arrestin对CXCR5.5的招募.
- 在carboxy-terminal尾部的CXCR5基位集群的位点定向突变发生.
- 在野生型和β-arrestin缺乏细胞中评估受体脱敏和内化.
- 分析ERK1/2酸化作为一个信号读出.
主要成果:
- 根据剂量,Beta-arrestin1和Beta-arrestin2通过CXCL13被招募到CXCR5中.
- 远端和中间的CXCR5位集群,但不是近端,对于β-arrestin招募和受体脱敏化是必需的.
- 对于CXCL13刺激的CXCR5内部化,不需要单独的基位集群.
- 由CXCL13刺激的CXCR5内化和ERK1/2酸化发生在淘汰细胞中独立于β-arrestins.
结论:
- β-阿雷斯被招募到CXCR5并调解脱敏,但对于内部化和信号传递是不可或缺的.
- 在CXCR5碳氧终端尾部的离散基位点集群指定β-arrestin的招募和脱敏.
- 这些发现表明,受体决定因素决定了在CXCR5.5处由β-arrestins介导的特定功能.
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