热力学和选择等离子体激活剂抑制剂-1 延迟过渡的选择
Laura M Haynes1, Matthew L Holding2, Jaie Woodard3
1Life Sciences Institute, University of Michigan, Ann Arbor, Michigan, USA.
The Journal of biological chemistry
|November 6, 2025
概括
深度突变扫描显示,蛋白质稳定性预测器,而不是变异效应预测器,最能解释Plasminogen激活器抑制剂-1 (PAI-1) 延迟过渡. PAI-1是PAI-1的第一个类型.
科学领域:
- 生物化学和分子生物学
- 蛋白质工程是指蛋白质的工程.
- 进化生物学 进化生物学
背景情况:
- 血原激活剂抑制剂-1 (PAI-1) 是一种血清蛋白酶抑制剂,具有转移稳定的活性构造,迅速过渡到潜伏状态.
- 了解控制PAI-1的结构稳定性和抑制功能的因素对于其生物作用至关重要.
研究的目的:
- 通过使用深度突变扫描 (DMS) 综合评估单氨基酸替代对PAI-1的延迟过渡和尿激酶类型等离子素激活剂 (uPA) 抑制的影响.
- 评估计算工具的预测能力,包括变异效应预测器和蛋白质稳定性预测器,用于解释PAI-1的DMS数据.
- 研究PAI-1的抑制功能和结构稳定性的进化约束.
主要方法:
- 进行了深度突变扫描 (DMS),以生成和测试PAI-1中几乎所有单氨基酸替代物.
- 使用变异效应预测器 (例如,变异效应的进化模型,AlphaMissense) 和蛋白质稳定性预测器 (EvoEF,FoldX) 分析了DMS数据.
- 进行了跨脊椎动物物种PAI-1序列空间的进化保护分析.
主要成果:
- 变异效应预测器可以在uPA抑制方面区分功能和非功能PAI-1变异,但对延迟过渡的影响预测不佳.
- 蛋白质稳定性预测指标表明,能量屏障对延迟过渡的变化是PAI-1延迟的主要驱动因素.
- 无论是PAI-1的uPA抑制功能还是其活性构造的热力学不稳定性,都在进行净化选择,限制序列变化.
结论:
- 深度突变扫描PAI-1的附带健康效应,如延迟过渡,更好地使用蛋白质热力学和进化背景来解释,而不是仅仅使用变异效应预测器.
- 该研究强调了考虑蛋白质稳定性和进化压力的重要性,以了解蛋白质的功能和变异.
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