转录因子MAX的突变通过改变折叠和结合途径,以全雌性方式增加DNA选择性.
Renee Hastings1, Arjun K Aditham2,3, Nicole DelRosso1
1Biophysics Program, Stanford University, Stanford, CA, USA.
Nature communications
|January 13, 2025
概括
蛋白质工程旨在通过了解连接体歧视来增强蛋白质选择性. 转录因子MAX的突变通过蛋白质构成的全调节改变了DNA选择性,而不是直接与DNA接触.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 蛋白质工程是指蛋白质工程.
背景情况:
- 蛋白质选择性,即区分喜欢和不喜欢的配体的能力,对于生物功能和蛋白质工程至关重要.
- 控制蛋白质选择性的生物物理机制尚未完全理解,这阻碍了预测能力和工程工作.
研究的目的:
- 研究转录因子 (TF) MAX的变异如何改变DNA特异性和选择性.
- 阐明了蛋白质中连接体选择性的全调节背后的生物物理机制.
主要方法:
- 测试了1700多个Kds和500个速率常数,用于与多个DNA序列结合的MAX变异.
- 将热力学和动力学建模应用于MAX和Pho4 (S. cerevisiae) TFs的实验数据.
- 结果与MAX-DNA复合体的已发表的结构数据进行了比较.
主要成果:
- 240个MAX点突变中的22个增强了选择性,但不是在直接接触DNA的残留物上.
- 突变改变了不同蛋白质构成之间的分区或在不同蛋白质构成中的亲和力,具有不同的内在选择性.
- 合规异质性在确定DNA序列选择性方面发挥着关键作用.
结论:
- 蛋白质构造的体调节为增强的连接体选择性提供了机械基础.
- 蛋白质结构异质性对于序列选择性至关重要,可以用于蛋白质工程.
- 这些发现指导了未来的努力,以改进选择性更好的工程蛋白质.
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