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L110M突变对ATTR的结构和稳定性的影响105-115) 组:一个计算研究

Prabuddha Bhattacharya¹, Sumit Mittal²

¹Department of Chemistry, Mrinalini Datta Mahavidyapith, Kolkata, India.

|September 4, 2025

概括

在TTR相关的amyloidosis中, transthyretin (TTR) 中的L110M突变适度地增加了粉样纤维的稳定性和β片含量. 这一发现增强了对开发向治疗的TTR聚合机制的理解.

科学领域:

结构生物学
生物化学
计算生物物理

背景情况:

粉样质组合机制是了解纤维化疾病和开发治疗方法的关键.
涉及到四聚体不稳定性的Transhyretin (TTR) 聚合驱动了与TTR相关的粉症.
多个突变对粉样转基因素 (ATTR) 自组合的影响需要进一步研究.

研究的目的:

通过计算分析L110M突变对ATTR聚合的原子影响.
调查野生型和L110M突变TTR在交叉β粉状纤维中的构造动态.
提供有关TTR相关疾病的amyloidogenesis的见解.

主要方法:

使用1μs全原子分子动力学 (MD) 模拟,共18μs.
对野生类型和L110M突变TTR的ATTR分段进行了检查.
执行了分子力学波伊森-博尔茨曼表面积 (MM-PBSA) 的计算.

主要成果:

在2,4和8系统中,L110M突变始终提高了β片含量 (~1%,~5%,~4%的增加).
MM-PBSA计算显示L110M突变体的有效结合自由能量更高.
M110残留物被确定为TTR组件稳定的一个重要因素.

结论:

在TTR组合中,L110M突变稍微增强了构造秩序和稳定性.
这种突变似乎不会对TTR聚合物的结构造成重大破坏.
这些发现加深了对TTR相关疾病和潜在治疗策略的了解.

关键词:

在ATTR MM-PBSA 公司粉样蛋白计算机模拟分子动力学模拟发生变异转氨酸

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