活性配体-受体键的强度和稳定性：通过分子马达栓系附着在壁上的微管
Strength and stability of active ligand-receptor bonds: a microtubule attached to a wall by molecular motor tethers
摘要：
我们开发了一个随机动力学模型的一个预先形成的附件的微管（MT）与细胞皮质，其中的MT是拴系到细胞的一组活跃的马达蛋白。这种连接是配体-受体键的一种特别独特的情况：MT配体通过聚合-解聚动力学随时间改变其长度（从而改变结合位点），而多个运动受体倾向于沿着MT长度主动行走。这些过程，结合力介导的马达的解绑，导致MT连接到细胞皮层的复杂行为。我们目前的结果的强度和寿命的系统，通过完善的力钳和力斜坡协议时，外部张力施加到MT。模拟结果表明，MT细胞附着行为作为一个捕捉债券或滑移债券取决于系统参数。我们提供了分析近似的寿命和讨论的影响，我们的结果在体外实验。
英文摘要：
We develop a stochastic kinetic model of a pre-formed attachment of a mictrotuble (MT) with a cell cortex, in which the MT is tethered to the cell by a group of active motor proteins. Such an attachment is a particularly unique case of ligand-receptor bonds: The MT ligand changes its length (and thus binding sites) with time by polymerization-depolymerization kinetics, while multiple motor receptors tend to walk actively along the MT length. These processes, combined with force-mediated unbinding of the motors, result in an elaborate behavior of the MT connection to the cell cortex. We present results for the strength and lifetime of the system through the well-established force-clamp and force-ramp protocols when external tension is applied to the MT. The simulation results reveal that the MT-cell attachment behaves as a catch-bond or slip-bond depending on system parameters. We provide analytical approximations of the lifetime and discuss implications of our results on in-vitro experiments.
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