On the pH-optimum of activity and stability of proteins.

On the pH-optimum of activity and stability of proteins.
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DOI:
10.1002/prot.22786
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发表时间:
2010-09
影响因子:
2.9
通讯作者:
Alexov, Emil
Alexov, Emil
中科院分区:
生物学4区
文献类型:
--
作者:
Talley, Kemper;Alexov, Emil

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生物大分子的进化是为了在特定的细胞环境(亚细胞室或组织)中发挥作用;因此,它们应该适应相应环境的生物物理特征,其中之一是特征pH。许多大分子性质都与pH有关,如活性和稳定性。然而,只有活性在生物学上是重要的,而稳定性可能不是相应反应的关键。在这里,我们用现有的实验数据表明,在一组310个蛋白质上,活性的最适pH(最大活性的pH)与稳定性的最适pH(最稳定的pH)相关。我们推测,这样的相关性是必要的,以允许相应的大分子容忍微小的pH波动,这是细胞功能不可避免的。我们的发现使将最稳定的pH与亚细胞隔室的特征pH相关联的努力合理化,因为只有活性的pH受到进化压力的影响。此外,我们的分析证实了先前的观察结果,即活性和稳定性的最适pH与等电点、等电点或最适温度无关。
Biological macromolecules evolved to perform their function in specific cellular environment (subcellular compartments or tissues); therefore, they should be adapted to the biophysical characteristics of the corresponding environment, one of them being the characteristic pH. Many macromolecular properties are pH dependent, such as activity and stability. However, only activity is biologically important, while stability may not be crucial for the corresponding reaction. Here we show that the pH-optimum of activity (the pH of maximal activity) is correlated with the pH-optimum of stability (the pH of maximal stability) on a set of 310 proteins with available experimental data. We speculate that such a correlation is needed to allow the corresponding macromolecules to tolerate small pH fluctuations that are inevitable with cellular function. Our findings rationalize the efforts of correlating the pH of maximal stability and the characteristic pH of subcellular compartments, since only pH of activity is subject of evolutionary pressure. In addition, our analysis confirmed the previous observation that pH-optimum of activity and stability are not correlated with the isoelectric point, pI, or with the optimal temperature.
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