探索沿着UUCG展开路径的超稳定状态,使用德鲁德力场
Diship Srivastava1, Shreya Mukherjee1, Niladri Patra1
1Department of Chemistry and Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, Dhanbad 826004, India.
Journal of chemical theory and computation
|June 29, 2025
概括
使用马尔科夫状态模型和分子动力学研究了UUCG发针展开路径. 混合方法揭示了四种不同的超稳定状态,极化力场提供了比非极化力场更完整的构造图像.
科学领域:
- 分子生物学分子生物学
- 计算化学的计算化学
- 生物物理学的生物物理.
背景情况:
- 在RNA中的针头环对于生物过程如折叠和mRNA稳定性至关重要.
- UUCG发针很常见,了解它们的展开是RNA三级结构的关键.
- RNA折叠中的转基因稳定状态对于各种细胞功能很重要.
研究的目的:
- 为了研究UUCG发针展开路径的转移稳定状态.
- 为了比较非极化和极化力场的构造采样.
- 阐明不同形状状态在UUCG发针功能中的作用.
主要方法:
- 一种混合方法,结合马尔科夫状态模型 (MSM) 和分子动力学模拟.
- 分析100μs轨迹使用非极化CHARMM36力场进行初始分离.
- 进一步描述使用可极化德鲁德力场识别的超稳定状态.
主要成果:
- UUCG发针展开遵循一个平行路径模型与微秒时间尺度.
- 确定了四种不同的元稳定状态,采样了不同的构造空间.
- 可偏化的德鲁德力场揭示了增强的非正规键和特定形状 (BI,syn,非C3'-endo).
结论:
- 非偏振的CHARMM36力场提供了一个不完整的UUCG发针转稳态的视图.
- 可偏化的德鲁德力场提供了对形状性质的更准确的描述.
- 了解这些状态对于解释非本地UUCG毛结构的生物学作用至关重要.
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