项目名称: 离子通道运输的原子到连续尺度计算方法
项目编号: No.91230105
项目类型: 重大研究计划
立项/批准年度: 2013
项目学科: 数理科学和化学
项目作者: Jakob Ulmschneider
作者单位: 上海交通大学
项目金额: 65万元
中文摘要: 电压门控钾离子(Kv)通道是动物细胞内极其重要的装置,例如是神经系统中电脉冲产生和传播的重要部件。Kv通道的研究,特别是高精度模拟有助于高效的新药设计。由于通道开闭的时间尺度(毫秒至秒)远超传统的原子模拟可达到的时间,多尺度模拟算法的建立与应用是非常急迫的问题。本项目将基于负责人过去的成果提出新型有效的多尺度算法。Kv通道模型包含二个时间尺度:慢模式使用全原子表示离子通道,膜和溶剂。在快模式中,将使用反应场混合模型和广义Born隐膜模型,膜和溶剂描述为极化的连续介质.这种混合方法可以将采样效率提高30~100倍,是达到毫秒时间尺度的关键所在。体系中的离子通道在隐式和显式模式下将保持全原子表示,在保持精度下在两个模式间快速和简单的转换。在宏观层次使用离子输运的PNP模型,并利用分子动力学模拟更新PNP中的扩散系数和介电常数。PNP将可以直接比较离子通道电导率的实测数据,为本项目提供基准数据。
中文关键词: 离子通道;脂质双分子层;;;
英文摘要: Voltage-gated K+ ion channels (Kv channels) are fundamentally important cellular machinery present in all animal cells and key components in the generation and propagation of electrical impulses in the nervous system. The accurate computer simulation of ion transport through Kv channels would be a major advance in biomedical research, allowing for the efficient design of novel drugs for a wide variety of pharmaceutical applications. However, the time scales necessary to study channel gating (~ms-s) is much longer than what can currently be reached via conventional atomistic simulations. Thus, new advanced algorithmic developments in multi-scale simulation techniques are urgently needed to study ion transport phenomena in biological systems. We propose here a novel multi-scaling technique based on algorithms recently successfully developed by us. Our approach goes significantly beyond earlier multi-scaling algorithms which usually involve a reduced representation of the biological system via use of coarse-graining techniques. In our technique, the channel is retained in its fully atomistic representation in both the fast (implicit) and detailed (explicit) modes, allowing for a fast and simple switching without loss of precision. This accuracy is the key to the success of capturing long-scale events of ion channel
英文关键词: Ion Channel;Membrane Protein;multi-scaling;;