使用质谱学对变形蛋白候选物的全蛋白质识别
Baiyi Ǫuan1, Yanping Ǫiu1,2, Kathleen Carillo3
1Proteome Exploration Laboratory, California Institute of Technology, Pasadena, CA 91125, USA.
bioRxiv : the preprint server for biology
|November 26, 2025
概括
了解蛋白质折叠在低温下如何发生变化至关重要. 这项研究绘制了大肠杆菌溶解酸中的冷依赖蛋白质构造变化,揭示了广泛的重塑,特别是在翻译机械中.
科学领域:
- 生物化学 生物化学
- 蛋白质组学是指蛋白质组学.
- 结构生物学 结构生物学
背景情况:
- 蛋白质折叠和结构变化对于细胞功能至关重要.
- 这些过程如何在全蛋白质体范围内受到温度的影响,尚不清楚.
- 低温可以诱导蛋白质中显著的结构重组.
研究的目的:
- 为了绘制Escherichia coli溶解酸中的蛋白质的冷依赖性构造变化.
- 开发和验证一种蛋白质学方法,用于评估温度诱导的蛋白质结构改造.
- 为了识别受低温折叠显著影响的蛋白质和细胞系统.
主要方法:
- 使用温度控制的蛋白解与液体染色学-并联质谱法 (LC-MS/MS) 相结合.
- 使用已知的变形蛋白 (Sa1V90T) 和其变体验证了方法.
- 将工作流应用于大肠杆菌溶解酸,以分析从35°C到5°C的全蛋白质组变化.
主要成果:
- 超过250种蛋白质的750个蛋白质分解位点显示了温度依赖的敏感性转移.
- 在冷却后确定了338个不稳定和426个稳定.
- 冷稳定在翻译机制 (例如,核糖体蛋白质) 中突出,而伴侣和细胞分裂因子显示出暴露的区域.
结论:
- 提供了整个蛋白质组对冷敏蛋白质折叠的全视图.
- 表明翻译和细胞动力学系统在低温下经历了显著的重塑.
- 提供了一种用于大规模识别变形蛋白的新策略.
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