拓反应坐标捕捉了折叠过渡状态组合在一个穿孔的拉索蛋白质
Jeffrey K Noel1, Ellinor Haglund2
1Structural Biology, Max Delbrück Center for Molecular Medicine, 13125 Berlin, Germany.
The journal of physical chemistry. B
|December 20, 2023
概括
穿孔的拉索拓蛋白,像勒一样,具有独特的折叠方式. 一个新的拓坐标,而不仅仅是本地联系,准确地描述了这些复杂的蛋白质结构的折叠过程和过渡状态.
科学领域:
- 生物化学和分子生物学
- 蛋白质折叠的动力学
- 计算生物物理学的计算生物物理学
背景情况:
- 穿孔拉索拓 (PLT) 的蛋白质具有独特的共价环,由多骨干线索.
- 这种拓表现出与结结蛋白质不同的特征,具有对环境的控制和对共价环的固有稳定性.
- 莱普作为研究PLT折叠机制的模型系统.
研究的目的:
- 通过使用分子动力学模拟来研究瘦素的折叠机制作为模型PLT系统.
- 为了确定适当的反应坐标来表征减少和氧化莱普的过渡状态组合 (TSE).
- 为了使理论上的phi值计算能够与实验数据进行比较.
主要方法:
- 利用基于结构的 (Go̅-like) 分子动力学模拟.
- 使用原生接触的分数 (Q) 作为减少蛋白质折叠的反应坐标.
- 开发并应用了拓坐标来监测氧化蛋白折叠的共价环的残留穿越.
主要成果:
- 降低勒丁的表现是一种两种状态的折叠机制,其特点是Q.
- 氧化丁的折叠被Q描述得很差;需要一个拓坐标来识别它的TSE.
- 在PLT蛋白中的循环线索约束导致非正规的,均的小phi值,这是由于TSE的平面能量格局.
结论:
- 一个拓坐标对于准确地描述氧化穿孔拉索拓蛋白的折叠TSE至关重要.
- 这项工作为计算PLT蛋白的理论phi值提供了一条途径,促进实验验证.
- PLT蛋白质的独特折叠约束导致了独特的能量特性和折叠路径.
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