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Na+在环八肽纳米管中的传输

DOI: 10.11830/ISSN.1000-5013.2014.04.0419, PP. 419-423

Keywords: 环肽纳米管,跨膜离子通道,拉伸动力学,分子模拟,传输

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Abstract:

为了探究环肽纳米管介导离子和小分子物质的跨膜转运机制,以环八肽纳米管中Na+为模型,采用拉伸分子动力学方法,研究了Na+在自组装环八肽纳米管{cyclo[-(D-Ala-L-Ala-)4-]}10中的传输.Na+沿纳米管轴向拉力作用方向运动,在每个环平面波动较长时间,占据环中心位置,然后迅速通过环间,跃迁到下一环平面.研究结果表明:Na+以跳跃方式在环肽纳米管中传输的平均速度为0.837m?s-1,其中在环平面的传输速度几乎为0,而在环间的瞬时传输速度可达350.8m?s-1,平均传输速度为111.8m?s-1.Na+在环肽纳米管内的环平面内受到阻力作用,在环间受到拉力作用.

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