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arXiv 1102.1590math.DSmath.AGq-bio.MN
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复曲面定态化学反应系统

Chemical reaction systems with toric steady states

Mercedes Perez Millan, Alicia Dickenstein, Anne Shiu, Carsten Conradi

摘要:

质量作用化学反应系统经常用于计算生物学。相应的多项式动力系统通常很大(由数十甚至数百个常微分方程组成),参数化程度很差(由于测量数据有噪声,数据点和重复次数较少)。因此,通常很难确定(正)稳态的存在或确定是否存在更复杂的现象,如多稳态。然而,如果系统的稳态理想是一个二项式理想,那么我们表明,这些问题可以很容易地回答。这项工作的重点是系统具有这种属性,我们说,这样的系统有复曲面的稳定状态。我们的主要结果给出了化学反应系统具有复曲面定态的充分条件。此外,我们分析了这样的系统的能力,表现出积极的稳定状态和多平稳性。具有复曲面稳态的系统的例子包括弱可逆零亏化学反应系统。我们的工作的一个重要应用涉及的网络,描述了一个蛋白质的多位点磷酸化的激酶/磷酸酶对在一个顺序和分布的机制。

英文摘要:

Mass-action chemical reaction systems are frequently used in Computational Biology. The corresponding polynomial dynamical systems are often large (consisting of tens or even hundreds of ordinary differential equations) and poorly parametrized (due to noisy measurement data and a small number of data points and repetitions). Therefore, it is often difficult to establish the existence of (positive) steady states or to determine whether more complicated phenomena such as multistationarity exist. If, however, the steady state ideal of the system is a binomial ideal, then we show that these questions can be answered easily. The focus of this work is on systems with this property, and we say that such systems have toric steady states. Our main result gives sufficient conditions for a chemical reaction system to have toric steady states. Furthermore, we analyze the capacity of such a system to exhibit positive steady states and multistationarity. Examples of systems with toric steady states include weakly-reversible zero-deficiency chemical reaction systems. An important application of our work concerns the networks that describe the multisite phosphorylation of a protein by a kinase/phosphatase pair in a sequential and distributive mechanism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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