蛋白质相互作用亲和力和特异性的遗传结构
Alexandra M Bendel1,2,3, Andre J Faure4,5, Dominique Klein1
1Friedrich Miescher Institute for Biomedical Research (FMI), Basel, Switzerland.
Nature communications
|October 14, 2024
概括
大多数突变广泛影响蛋白质结合亲和力,而罕见的突变改变了特异性. 特异性来自于残留物促进目标和防止目标外相互作用,揭示了蛋白质家族中的分布式编码.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 遗传学 遗传学 是一个
背景情况:
- 了解蛋白质与蛋白质相互作用 (PPI) 对于破译生物过程至关重要.
- 控制PPI特异性和亲和性的进化机制在很大程度上仍然未知.
- 基本氨酸拉链 (bZIP) 转录因子代表着一个拥有多样化交互伙伴的大家庭.
研究的目的:
- 量化JUN蛋白的所有可能突变对其对54种人类bZIP转录因子的结合亲和力和特异性的影响.
- 阐明突变如何影响大型蛋白质家族中的亲和力和特异性的分子基础.
- 调查交互界面内的分布式残留物在确定结合特性的作用.
主要方法:
- 关于JUN蛋白的综合性突变发生.
- 在所有54个人类bZIP合作伙伴中量化测量结合亲和力和特异性.
- 全球热力学建模用于分析突变效应.
- 在相互作用界面内分析残留物分布.
主要成果:
- 大多数突变在所有结合性伴侣中均地改变了JUN的亲和力.
- 影响结合特异性的突变不常见,但位于整个相互作用界面.
- 确定特异性的残留物往往在促进目标和防止目标外结合方面发挥了双重作用.
- 改变特异性的接口突变在很大程度上是类的,也影响了亲和力.
- 接口之外的突变可以调节全球亲和力,而不会影响特异性.
结论:
- 在PPI中,特异性和亲和力以分布式的方式在交互界面中编码.
- 卷轴-卷轴结构为优化大型蛋白质家族中的特异性和亲和性提供了一个有效的机制.
- 该研究提供了对产生多样化但特定蛋白质相互作用的进化策略的见解.
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