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Blood:VWF与血小板整合素结合的C4结构域的结构和动力学解析

2018-10-11 MedSci MedSci原创

血管假性血友病因子(VWF)是调控止血的关键因子,可促进招募血小板聚集到血管损伤处。由6个C端结构域形成二聚体C末端VWF阀杆。当剪切力激活时,阀杆变成开放性构象,允许VWF黏附到血小板和血管壁。要解析其潜在分子机制和疾病相关突变所导致的功能紊乱,明确C端结构域的结构和动力学首当其冲。研究人员发现VWF C4结构域的解结构可结合血小板整合素,对VWF功能至关重要。在该结构域中,我们发现了五个子结构

血管假性血友病因子(VWF)是调控止血的关键因子,可促进招募血小板聚集到血管损伤处。由6个C端结构域形成二聚体C末端VWF阀杆。当剪切力激活时,阀杆变成开放性构象,允许VWF黏附到血小板和血管壁。

要解析其潜在分子机制和疾病相关突变所导致的功能紊乱,明确C端结构域的结构和动力学首当其冲。研究人员发现VWF C4结构域的解结构可结合血小板整合素,对VWF功能至关重要。在该结构域中,我们发现了五个子结构域内和域间二硫化亚铁桥,其中一个在C结构域中独一无二。

对结构进一步研究发现了一个不同寻常的铰链双子域排列。铰链被限制在连接两个子域的V2547附件的一个非常短的片段内。该铰链与相邻的两个子域间二硫化亚铁桥一起,诱导两个子域相对彼此发生缓慢的构象变化和位置变动。除此之外,研究人员进一步证实了一个临床上的功能获得性VWF突变(Y2561)更可能影响C4结构域与邻近结构域的排列,而不是影响血小板整合素结合。


原始出处:

Emma-Ruoqi Xu,et. Structure and dynamics of the platelet integrin-binding C4 domain of von Willebrand factor. Blood  2018  :blood-2018-04-843615;  doi: https://doi.org/10.1182/blood-2018-04-843615

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    2019-05-11 gjsgj
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    2019-07-24 hongbochen
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    2018-10-13 sunmin0219
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    2018-10-11 xuexin53

    学习

    0

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    2018-10-11 天地飞扬

    了解一下,谢谢分享!

    0

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    2018-10-11 1e145228m78(暂无匿称)

    学习了,谢谢作者分享!

    0

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    2018-10-11 医者仁心5538

    学习了

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