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arXiv 2003.00141physics.bio-phcond-mat.stat-mech
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稳态和非稳态条件下mRNA翻译中核糖体的动力学

Dynamics of ribosomes in mRNA translation under steady and non-steady state conditions

Juraj Szavits-Nossan, Martin R. Evans

摘要:

DNA测序和荧光成像的最新进展使得监测积极参与信使RNA(mRNA)翻译的核糖体的动力学成为可能。在这里,我们模拟这些实验中的不均匀的完全不对称的简单排斥过程(TASEP)使用现实的动力学参数。特别是,我们提出了分析表达式来描述以下三种情况:(a)翻译的新转录的mRNA,(b)在稳定状态下的翻译,特别是动态的个人(标记)核糖体和(c)径流翻译后,抑制翻译启动。在(b)和(c)的情况下,我们开发了一个有效介质近似来描述多核糖体动力学在一个有效介质中的单个标记的核糖体。的预测是在良好的协议与随机模拟。

英文摘要:

Recent advances in DNA sequencing and fluorescence imaging have made it possible to monitor the dynamics of ribosomes actively engaged in messenger RNA (mRNA) translation. Here, we model these experiments within the inhomogeneous totally asymmetric simple exclusion process (TASEP) using realistic kinetic parameters. In particular we present analytic expressions to describe the following three cases: (a) translation of a newly transcribed mRNA, (b) translation in the steady state and, specifically the dynamics of individual (tagged) ribosomes and (c) run-off translation after inhibition of translation initiation. In the cases (b) and (c) we develop an effective medium approximation to describe many-ribosome dynamics in terms of a single tagged ribosome in an effective medium. The predictions are in good agreement with stochastic simulations.

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