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arXiv 0905.4232q-bio.BM
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跨蛋白质家族的刚性比较分析

Comparative analysis of rigidity across protein families

SA Wells, JE Jimenez-Roldan, RA Römer

摘要:

利用“卵石游戏”进行的刚性分析已被应用于蛋白质晶体结构,以获得关于蛋白质折叠、组装以及结构-功能关系的信息。然而,以前的工作,使用这种技术还没有明确的氢键约束的设置包括在刚度分析中应如何选择,也不敏感的刚度分析的结果是小的结构变化。我们提出了一个比较研究,其中“卵石游戏”刚性分析应用于多个蛋白质晶体结构,为每个六个同源蛋白质家族。我们发现,在一个给定的氢键能量截止的蛋白质结构的主链刚性是相当敏感的小的结构变化,并得出结论,氢键约束的刚性分析应选择,以形成和测试特定的假设的刚性的特定蛋白质。我们的比较方法突出了两种不同的特征模式(“突然”或“渐进”)的蛋白质刚性损失的限制被删除,在最近的结果与玻璃网络的刚性转变。

英文摘要:

Rigidity analysis using the "pebble game" has been applied to protein crystal structures to obtain information on protein folding, assembly and t he structure-function relationship. However, previous work using this technique has not made clear how the set of hydrogen-bond constraints included in the rigidity analysis should be chosen, nor how sensitive the results of rigidity analysis are to small structural variations. We present a comparative study in which "pebble game" rigidity analysis is applied to multiple protein crystal structures, for each of six differen t protein families. We find that the mainchain rigidity of a protein structure at a given hydrogen-bond energy cutoff is quite sensitive to small structural variations, and conclude that the hydrogen bond constraints in rigidity analysis should be chosen so as to form and test specific hypotheses about the rigidity o f a particular protein. Our comparative approach highlights two different characteristic patterns ("sudden" or "gradual") for protein rigidity loss as constraints are re moved, in line with recent results on the rigidity transitions of glassy networks.

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