对旋转和质子状态赋值 (RAPA) 的自我一致的方法:超越单个蛋白质配置
Mossa Ghattas1, Prerna Gera2, Steven Ramsey3
1Ph.D. Program in Chemistry, The Graduate Center, City University of New York, New York, New York 10016, United States.
Journal of chemical information and modeling
|June 11, 2025
概括
蛋白质晶体结构的模糊性来自于无法溶解的原子,导致多种可能的旋转和质子状态. 我们的旋转和质子分配 (RAPA) 协议识别了这些能量一致的状态,揭示了大多数蛋白质的多种配置.
科学领域:
- 结构生物学 结构生物学
- 计算生物学 计算生物学
- 生物化学 生物化学
背景情况:
- 蛋白质数据库包含超过16万个X射线晶体结构,其分辨率在原子无法分辨的情况下.
- 低分辨率的晶体结构导致关键氨基酸 (Asn, Gln, His, Ser, Tyr, Thr) 的旋转和质子化状态的模糊性.
- 这些状态的变化会改变结合点的电化学表面,影响分子相互作用.
研究的目的:
- 为了解决蛋白质晶体结构中氨基酸残留的旋转和质子化状态的模糊性.
- 为分析这些状态,引入一个新的计算协议 - - Rotamer and Protonation Assignment (RAPA)
- 为了确定是否存在多个能量一致的状态,并且在计算上是可行的调查.
主要方法:
- 开发了旋转和质子赋值 (RAPA) 协议.
- 雷帕分析了在已解决的蛋白质结构中的局部结合环境.
- 使用分子动力学模拟评估RAPA预测的配置.
主要成果:
- 确定了一组独特的旋转和质子化状态,其能量与实验晶体结构一致.
- 发现大多数蛋白质 (69/77) 的多个配置与X射线数据一致.
- 可访问状态的数量有限 (≤8对于62/77蛋白质),表明计算可行性.
结论:
- 多个旋转和质子化状态与实验确定的蛋白质晶体结构一致.
- 该RAPA协议提供了一种可行的方法来识别这些状态.
- 这种方法避免了组合式爆炸,使蛋白质结合点电化学的全面分析.
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