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arXiv 2006.06476physics.bio-phphysics.chem-ph
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不可逆Michaelis-Menten方程的热力学有效性判据

Thermodynamic validity criterion for the irreversible Michaelis-Menten equation

Valérie Voorsluijs, Francesco Avanzini, Massimiliano Esposito

摘要:

酶动力学通常由不可逆的Michaelis-Menten(MM)方程表征。然而,在开放的化学反应网络,如代谢途径,这种方法可能会导致显着的动力学和热力学不一致。基于非平衡化学热力学的最新发展,我们提出了一个完全用酶催化反应的平衡常数表示的有效性判据。当满足时,它保证了不可逆MM方程产生动力学和热力学数据的能力,这些数据在合理的浓度范围内是定量可靠的。因此,我们的有效性标准是一个宝贵的工具,以确保可靠的动力学和热力学建模的途径。我们还表明,它正确地识别糖酵解和克雷布斯循环中所谓的不可逆酶促反应。

英文摘要:

Enzyme kinetics is very often characterised by the irreversible Michaelis-Menten (MM) equation. However, in open chemical reaction networks such as metabolic pathways, this approach can lead to significant kinetic and thermodynamic inconsistencies. Based on recent developments in nonequilibrium chemical thermodynamics, we present a validity criterion solely expressed in terms of the equilibrium constant of the enzyme-catalysed reaction. When satisfied, it guarantees the ability of the irreversible MM equation to generate kinetic and thermodynamic data that are quantitatively reliable for reasonable ranges of concentrations. Our validity criterion is thus a precious tool to ensure reliable kinetic and thermodynamic modelling of pathways. We also show that it correctly identifies the so-called irreversible enzymatic reactions in glycolysis and Krebs cycle.

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