基于分子对接和分子动力学模拟的蛋白质L亲和染色体的配体的计算设计
Saman Rahmati1, Kowsar Bagherzadeh2,3, Seyed Shahriar Arab4
1Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran.
Journal of biomolecular structure & dynamics
|October 19, 2023
概括
工程蛋白 L B 域显示对抗体碎片增强的结合亲和力. 分子模拟和同质模型创造了稳定的,高亲和度的蛋白质L变体,以改善抗体净化.
科学领域:
- 生物化学 生物化学
- 蛋白质工程是指蛋白质的工程.
- 计算生物学 计算生物学
背景情况:
- 来自*Peptostreptococcus magnus*的L蛋白与人体免疫球蛋白 (Ig) 的卡帕轻链结合.
- 蛋白L对于通过亲和染色学净化抗体碎片至关重要.
- 蛋白质工程和计算生物学使得改进的亲缘关系连接体的开发成为可能.
研究的目的:
- 为了设计蛋白质L的单个B域,增强对抗体碎片的结合亲和力.
- 为了创建聚合蛋白质L配体,提高亲和力和稳定性.
- 为了评估工程L蛋白变体的结合亲和力和稳定性.
主要方法:
- 用分子动力学模拟 (MDs) 来设计修改的蛋白 L B 域.
- 鱼软件被用于蛋白质设计.
- 同质模型被用来将单个B域聚合成六域联结体.
- 进行了分子对接,以评估结合亲和力.
主要成果:
- 单个B域突变MB1 (Thr865Trp) 和MB2 (Thr847Met-Thr865Trp) 与野生类型相比,对Fab片段的结合亲和力更高.
- 聚合蛋白L结构 (野生型和突变6B0,6B1,6B2) 在MDs期间表现出稳定性.
- 突变6B1和6B2与野生型聚合蛋白L相比,对Fab片段的结合亲和力更强.
结论:
- 工程化单个B域和聚合蛋白L变体表现出对抗体碎片的增强结合亲和力.
- 开发的蛋白L突变体为更有效的抗体片段净化提供了潜力.
- 计算和蛋白质工程方法在设计高 afinity 蛋白质连接体方面是有效的.
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