通过分子动力学模拟在石墨烯接口上吸附和聚合Pili蛋白类型IVb热力学:自由能量研究
Sourav Verma1, Dipayan Samanta2, Rajesh K Sani1
1Karen M. Swindler Department of Chemical and Biological Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA; 2-Dimensional Materials for Biofilm Engineering, Science and Technology, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA.
Colloids and surfaces. B, Biointerfaces
|October 28, 2025
概括
这项研究使用分子动力学来展示硫酸盐减少细菌 (SRB) 的pilin蛋白最初如何附着在石墨烯表面. 石墨烯通过范德瓦尔斯力增强蛋白质聚合,影响生物膜形成和生物腐蚀.
科学领域:
- 材料科学 材料科学 材料科学
- 微生物学 微生物学
- 计算化学计算化学
背景情况:
- 微生物生物腐蚀,通常是由硫酸盐减少细菌 (SRB) 引起的,是一个主要的工业问题.
- 了解像石墨烯这样的先进材料的早期生物膜粘附机制至关重要,但有限.
- 第四类 pili,特别是 tad flp pilin 组成部分,是 SRB 生物膜中的关键初始附着蛋白.
研究的目的:
- 为了研究泰德flp柱子组件和原始石墨烯 (PG) 表面之间的分子相互作用.
- 阐明2D材料上皮林蛋白吸附和形状变化的机制.
- 用计算方法预测石墨烯上的蛋白质吸附和组装亲和力.
主要方法:
- 使用Oleidesulfovibrio alaskensis G20作为模型生物体进行了分子动力学 (MD) 模拟.
- 使用增强的自由能量采样方法来计算吸附和组装亲和度.
- 分析包括根-平均-平方偏差 (RMSD),接触面积 (CSA) 和热力学参数 (结合自由能量,内部能量,).
主要成果:
- 皮林对石墨烯的吸附是由物理吸附和范德瓦尔斯相互作用驱动的,结合的自由能量为-34.68 kcal/mol.
- 蛋白质吸附诱导了部分展开,α2螺旋向石墨烯表面曲.
- 与散装水相比,石墨烯增强了蛋白质聚合,增加了CSA并影响了聚合模式,这可能是由于其较大的表面积.
结论:
- 这项研究提供了分子层面的洞察力,了解烯-石墨烯相互作用,这对于理解2D材料上的生物膜粘附至关重要.
- 皮林在石墨烯上的吸附和聚合受范德瓦尔斯力和表面积的影响.
- 这些发现为开发基于石墨烯的涂层提供了机械基础,以防止微生物殖民和生物腐蚀.
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