生物细胞内催化的动态控制
Dynamic control of catalysis within biological cells
摘要:
我们发展了一个生物细胞内的酶催化理论,其中底物浓度[S](t)是时间依赖性的,与假设稳态的Michaelis-Menten理论相反。我们发现,随时间变化的浓度可以结合,以非线性的方式,与酶的自由能景观的坚固性(发现在单分子研究和模拟),以提供一个高效的开关(或分叉)之间的两个催化活性状态,在一个关键的底物浓度。这允许动态控制细胞中的产物合成。
英文摘要:
We develop a theory of enzyme catalysis within biological cells where the substrate concentration [S](t) is time dependent, in contrast to the Michaelis-Menten theory that assumes a steady state. We find that the time varying concentration can combine, in a non-linear way, with the ruggedness of the free energy landscape of enzymes (discovered both in single molecule studies and in simulations) to provide a highly efficient switch (or, bifurcation) between two catalytically active states, at a critical substrate concentration. This allows a dynamic control of product synthesis in cell.
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