Department of Physics, University of Alberta, Edmonton, Alberta, Canada.
PLoS One. 2012;7(6):e37251. doi: 10.1371/journal.pone.0037251. Epub 2012 Jun 25.
The cytoskeleton is essential to cell morphology, cargo trafficking, and cell division. As the neuronal cytoskeleton is extremely complex, it is no wonder that a startling number of neurodegenerative disorders (including but not limited to Alzheimer's disease, Parkinson's disease and Huntington's disease) share the common feature of a dysfunctional neuronal cytoskeleton. Recently, concern has been raised about a possible link between anesthesia, post-operative cognitive dysfunction, and the exacerbation of neurodegenerative disorders. Experimental investigations suggest that anesthetics bind to and affect cytoskeletal microtubules, and that anesthesia-related cognitive dysfunction involves microtubule instability, hyper-phosphorylation of the microtubule-associated protein tau, and tau separation from microtubules. However, exact mechanisms are yet to be identified. In this paper the interaction of anesthetics with the microtubule subunit protein tubulin is investigated using computer-modeling methods. Homology modeling, molecular dynamics simulations and surface geometry techniques were used to determine putative binding sites for volatile anesthetics on tubulin. This was followed by free energy based docking calculations for halothane (2-bromo-2-chloro-1,1,1-trifluoroethane) on the tubulin body, and C-terminal regions for specific tubulin isotypes. Locations of the putative binding sites, halothane binding energies and the relation to cytoskeleton function are reported in this paper.
细胞骨架对于细胞形态、货物运输和细胞分裂至关重要。由于神经元细胞骨架极其复杂,毫不奇怪,许多神经退行性疾病(包括但不限于阿尔茨海默病、帕金森病和亨廷顿病)都具有细胞骨架功能失调的共同特征。最近,人们对麻醉、术后认知功能障碍和神经退行性疾病恶化之间可能存在联系表示关注。实验研究表明,麻醉剂与细胞骨架微管结合并影响其功能,与麻醉相关的认知功能障碍涉及微管不稳定、微管相关蛋白 tau 的过度磷酸化以及 tau 与微管分离。然而,确切的机制仍有待确定。本文采用计算机建模方法研究了麻醉剂与微管亚基蛋白微管蛋白的相互作用。同源建模、分子动力学模拟和表面几何技术用于确定微管蛋白上挥发性麻醉剂的潜在结合位点。然后,针对特定微管蛋白同工型的微管蛋白主体和 C 末端区域进行基于自由能的卤烷(2-溴-2-氯-1,1,1-三氟乙烷)对接计算。本文报告了潜在结合位点的位置、卤烷结合能以及与细胞骨架功能的关系。
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