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arXiv 2006.02195physics.bio-phcond-mat.soft
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一步酶促反应的交叉扩散诱导模式

Cross-diffusion induced patterns for a single-step enzymatic reaction

Giovanni Giunta, Hamid Seyed-Allaei, Ulrich Gerland

摘要:

几种不同的酶显示出随其底物浓度增加的表观扩散系数。此外,它们的运动在衬底梯度中变得定向。目前,有几个相互竞争的模型,这些运输动力学。在这里,我们分析酶促反应是否可以产生显着的反馈,从酶运输到底物的配置文件。我们发现,这种反馈可以产生空间格局的酶分布,只有一个单步催化反应。然而,模式只形成一个子类的运输模型。对于这样的模型,酶和底物之间的非特异性排斥相互作用导致酶在低底物浓度的区域中积累。然后反应放大了局部底物的波动,导致酶在底物低的地方进一步积累。对这种斑图形成过程的实验分析可以区分不同的传输模型。

英文摘要:

Several different enzymes display an apparent diffusion coefficient that increases with the concentration of their substrate. Moreover, their motion becomes directed in substrate gradients. Currently, there are several competing models for these transport dynamics. Here, we analyze whether the enzymatic reactions can generate a significant feedback from enzyme transport onto the substrate profile. We find that this feedback can generate spatial patterns in the enzyme distribution, with just a single-step catalytic reaction. However, patterns are formed only for a subclass of transport models. For such models, nonspecific repulsive interactions between the enzyme and the substrate cause the enzyme to accumulate in regions of low substrate concentration. Reactions then amplify local substrate fluctuations, causing enzymes to further accumulate where substrate is low. Experimental analysis of this pattern formation process could discriminate between different transport models.

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