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微小的序列变化如何使MFS传送器的机械多样性? 在NarU中Symport出现的原子层次的理由
Tanner J Dean1, Jiangyan Feng2, Diwakar Shukla1,2,3,4,5
1Center for Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.
像NarU这样的细菌膜载体的微小序列变化可以大幅改变它们的传输机制,从抗载体转换为潜在的同载体活动. 这凸显了微妙的适应如何重编程传送器功能.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 膜载体表现出功能分歧,尽管序列相似.
- 细菌中酸盐和酸盐的运输涉及MFS传送器NarK (抗载体) 和NarU (机制未解决).
研究的目的:
- 通过计算模拟来阐明NarU的运输机制.
- 将NarU的机制与已知的反载体NarK的机制进行对比.
主要方法:
- 适应性的分子动力学模拟.
- 马尔科夫状态建模用于绘制构造自由能量景观的地图.
- 关闭通路和关键残留物相互作用的分析.
主要成果:
- NarU展示了明显的不对称性,有利于面向外的状态.
- 确定了一种新型的apo-occluded中间体,通过氨酸旋转和糖氨酸替代稳定.
- 这些功能将NarU重新编程为合共运输,与NarK不同.
结论:
- 特定的残留物替代可以从根本上改变输送机制.
- 纳鲁的独特的门能量和中间稳定对应运输活动.
- 序列依赖的适应是相关载体中功能分歧的关键.
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