使用可丰富链接器的定量甘氨酸-蛋白质交叉链接质谱学揭示了广泛的甘氨酸介导蛋白质相互作用网络
Siyu Chen1, Yixuan Xie1,2, Michael Russelle Alvarez1
1Department of Chemistry, University of California, Davis, California 95616, United States.
Analytical chemistry
|January 13, 2025
概括
我们开发了一种新的方法来研究通过酸调解的细胞表面蛋白相互作用. 该技术通过交叉链接甘氨酸和蛋白质来识别蛋白质网络和潜在的治疗点.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 葡萄糖生物学 葡萄糖生物学
背景情况:
- 细胞膜蛋白相互作用对于细胞功能至关重要.
- 甘氨酸,特别是终端酸,在这些相互作用中扮演着重要的角色.
- 了解这些相互作用是解读细胞过程和疾病机制的关键.
研究的目的:
- 开发和验证一种定量交叉链接方法,以探测细胞表面上酸介导的蛋白质-蛋白质相互作用.
- 为了识别和描述酸介导的细胞表面蛋白质网络.
- 为发现新型治疗点提供一个工具.
主要方法:
- 设计和合成了生物化,点击标记的交叉链接器,用于亚酸-酸的代谢结合.
- 利用点击化学来与蛋白质上的近接氨酸残留物交叉链接阿齐多-甘氨酸.
- 使用斯特雷普塔维丁树脂珠进行亲和性净化,以丰富糖-交叉链接 (GPx).
- 开发了使用可光切割和二硫化连接剂进行定量分析的工作流程.
主要成果:
- 成功地将该方法应用于PNT2 (前列腺) 细胞,揭示了酸介导的细胞表面蛋白质网络.
- 鉴定了12,000个GPx,由化甘油形式连接在一起,将甘油蛋白连接到近700个标蛋白.
- 具有特征的蛋白质-蛋白质相互作用,与丰富的膜蛋白质,如ITGB1显示广泛的互动体 (约. 400 种蛋白质).
- 基于GPx数量的量化相互作用,使互动强度的优先级成为可能.
结论:
- 开发的定量交叉链接方法 (GPx) 有效地绘制了酸介导的蛋白质与蛋白质相互作用.
- 这种方法增强了对糖化在细胞表面相互作用中的作用的理解.
- 鉴定的蛋白质网络和相互作用为治疗开发提供了潜在的新目标.
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