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arXiv 1111.5165q-bio.BMphysics.bio-ph
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点突变对蛋白质能量传导途径的影响

The effect of point mutations on energy conduction pathways in proteins

Nazan B. Walpoth, Burak Erman

摘要:

利用简单的弹性网络模型对心肌Ryanodine受体RyR 2 N端173个氨基酸结构域的能量响应性残基进行了鉴定。以相关方式响应于空间相邻残基的波动的残基指定通过蛋白质的氢键路径。蛋白质的进化保守残基都位于这条路径上或其附近。该路径的所有残基要么位于蛋白质的两个Mir结构域上,要么与它们氢键结合。基于对另一种钙通道受体--三磷酸肌醇受体(IP 3R)的弹性网络分析结果,提出了两个钙结合残基E171和E173为潜在的结合区域。对导致A77 V突变的RyR 2的疾病的分析表明,该路径被某些残基的能量响应性的丧失所破坏。

英文摘要:

Energetically responsive residues of the 173 amino acid N-terminal domain of the cardiac Ryanodine receptor RyR2 are identified by a simple elastic net model. Residues that respond in a correlated way to fluctuations of spatially neighboring residues specify a hydrogen bonded path through the protein. The evolutionarily conserved residues of the protein are all located on this path or in its close proximity. All of the residues of the path are either located on the two Mir domains of the protein or are hydrogen bonded them. Two calcium binding residues, E171 and E173, are proposed as potential binding region, based on insights gained from the elastic net analysis of another calcium channel receptor, the inositol 1,4,5-triphosphate receptor, IP3R. Analysis of the disease causing A77V mutated RyR2 showed that the path is disrupted by the loss of energy responsiveness of certain residues.

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