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蛋白质折叠分析的多层框架,涉及二硫化物键形成

Patryk A Wesołowski¹, David J Wales¹, Philipp Pracht¹

¹Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.

The journal of physical chemistry. B

|March 21, 2024

概括

这项研究使用多尺度ONIOM方法来建模牛胰腺素抑制剂 (BPTI) 的折叠,揭示了二硫化键在其结构稳定性和折叠途径中的关键作用.

科学领域:

计算化学的计算化学
生物分子建模模型
蛋白质折叠的动力学

背景情况:

了解蛋白质折叠对于破译生物功能至关重要.
牛胰腺素抑制剂 (BPTI) 作为研究蛋白质折叠的模型系统.
折叠路径的准确表征需要多尺度的计算方法.

研究的目的:

用三层多中心ONIOM方法来描述BPTI的天真折叠路径.
调查BPTI的结构稳定性,强调二硫化物键的作用.
评估实施的多尺度方法的准确性和效率.

主要方法:

采用了三层多中心ONIOM (我们自己的N层集成分子轨道和分子力学) 方法.
在外层使用GFN-FF,中间层使用GFN2-xTB,最内层使用r2SCAN-3c.
使用氧化囊形成的QM/SQM/MM方法进行了基准测试,并计算了BPTI中间体的自由能量贡献.

主要成果:

该研究阐明了BPTI的天真折叠路径,强调了二硫化物键对结构完整性的重要性.
评估了折叠中间体的相对稳定性,量化了二硫化物键的影响.
多中心ONIOM方法证明了计算精度和效率之间的平衡.

结论:

多中心ONIOM方法为描述生物分子系统中的电子结构效应提供了全面的解决方案.
多尺度能源景观探索是研究像BPTI这样复杂的生物目标的强有力的方法.
二硫化物债券在BPTI的稳定性和折叠机制中发挥着关键作用.

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