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通过分子动力学模拟揭示的λCro功能的分子机制

Ryan Hebert^1,2, Alexander Perez^1,2, Jeff Wereszczynski^1,2

¹Department of Physics, Illinois Institute of Technology, Chicago, USA.

bioRxiv : the preprint server for biology

|September 2, 2025

概括

菌体 λ Cro (转录因子) 的最小突变会改变其DNA结合和调节功能. 这些变化揭示了紧的转录因子如何通过序列,结构和动态来发展新的能力.

科学领域:

分子生物学
生物物理
遗传学

背景情况:

转录因子是所有生命领域的基因表达的关键调节者.
菌体 λ Cro 是一个小型抑制蛋白,是研究转录因子结构功能关系的成熟模型.
克罗的工程变体表明,最小的序列改变可以赋予双重抑制和激活功能.

研究的目的:

研究转录因子适应性的分子机制.
了解细菌体 λ Cro 中的小序列变化如何影响其DNA结合特性和调节潜力.
在紧的转录因子中探索序列,结构,动态和功能之间的关系.

主要方法:

在野生型Cro和两个工程变体 (Act3和Act8) 上进行了多微秒全原子分子动力学模拟.
分析的重点是相互作用表面的变化,DNA结合方式,结合亲缘关系和分子内通信途径.
这项研究研究了最小的序列变化对蛋白质结构和动态的影响.

主要成果:

在Cro的最小序列变化导致了相互作用表面的显著重组.
模拟显示了DNA结合模式的变化和调节的DNA结合亲和力.
内分子通讯途径被重新分配,与改变的DNA结合和调节潜力相关.

结论:

紧的转录因子可以通过微妙的序列修改来演变新的功能,从而影响它们的动态和相互作用.
分子动力学模拟为了解序列,结构和动力学如何控制转录因子功能提供了机制框架.
这项研究提供了基因调节蛋白的进化适应性.

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