揭示了 sol g 2.1 蛋白质和潜在的连接体结合的pH取决于形状的变化
Siriporn Nonkhwao1,2, Doungkamol Leaokittikul1, Rina Patramanon3,2
1Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand.
Scientific reports
|September 11, 2024
概括
Sol g 2.1 火毒素中的蛋白质在中性pH下最好地结合疏水分子. 分子模拟证实了在pH7.4下更高的亲和力和稳定性,表明其作为pH响应药物递送载体的潜力.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 热带火毒液 (Solenopsis geminata) 中的主要蛋白质Sol g 2具有显著的疏水分子结合能力.
- 重组Sol g 2.1蛋白 (rSol g 2.1) 正在研究其与疏水性联体的相互作用.
研究的目的:
- 在中性 (pH 7.4) 和酸性 (pH 5.5) 条件下评估rSol g 2.1与 (E) -β-Farnesene,α-Caryophyllene和1-Octen-3-ol的结合亲和力.
- 使用计算方法阐明rSol g 2.1-连接体复合体的结构稳定性和结构动力学.
主要方法:
- 使用光竞争性结合试验 (FCBA) 来确定结合亲缘关系.
- 进行了分子对接和分子动力学模拟以分析复杂的稳定性和动力学.
主要成果:
- rSol g 2.1 在pH 7.4与pH 5.5.5相比,对测试的连接体具有更高的结合亲和力.
- 分子动力学模拟表明,在中性pH下,结构稳定性更高 (RMSD,RMSF,Rg,SASA,PCA) 和结合自由能量更低 (∆Gbind).
- 关键的非极性氨基酸 (Trp36,Met40,Cys62,Ile104) 在pH 7.4.4时显著促进了较高的结合亲和力.
结论:
- Sol g 2.1 蛋白质作为 pH 响应的载体,在中性 pH 处表现出最佳的联结和稳定性.
- 这些发现增强了对蛋白质-连接体相互作用的理解,并建议在向药物递送系统中潜在的应用.
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