The MDMX Acidic Domain Uses Allovalency to Bind Both p53 and MDMX.

The MDMX Acidic Domain Uses Allovalency to Bind Both p53 and MDMX.
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DOI:
10.1016/j.jmb.2022.167844
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发表时间:
2022-11-30
影响因子:
5.6
通讯作者:
Daughdrill, Gary
Daughdrill, Gary
中科院分区:
生物学2区
文献类型:
--
作者:
Fenton, Malissa;Borcherds, Wade;Chen, Lihong;Anbanandam, Asokan;Levy, Robin;Chen, Jiandong;Daughdrill, Gary

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p53 与 MDMX 结合的自抑制需要两个包含相邻色氨酸 (WW) 和色氨酸-苯丙氨酸 (WF) 残基的短线性基序 (SLiM)。 NMR 光谱用于显示 WW 和 WF 基序直接竞争 MDMX 上的 p53 结合位点,圆二色光谱用于显示 WW 基序在与 MDMX 的 p53 结合域 (p53BD) 结合时变成螺旋状。使用等温滴定量热法的结合研究表明,当 WW 基序均通过天然无序接头连接到 p53BD 时,WW 基序是比 WF 基序更强的 p53 结合抑制剂。我们还研究了 WW 和 WF 基序如何与 p53 的 DNA 结合域 (DBD) 相互作用。两个基序独立地结合 DBD 上与 DNA 结合位点重叠的相似位点。总而言之,我们的工作定义了 MDMX 和 p53 之间复合物形成的模型,其中一对无序的 SLiM 结合两种蛋白质上的重叠位点。
Autoinhibition of p53 binding to MDMX requires two short-linear motifs (SLiMs) containing adjacent tryptophan (WW) and tryptophan-phenylalanine (WF) residues. NMR spectroscopy was used to show the WW and WF motifs directly compete for the p53 binding site on MDMX and circular dichroism spectroscopy was used to show the WW motif becomes helical when it is bound to the p53 binding domain (p53BD) of MDMX. Binding studies using isothermal titration calorimetry showed the WW motif is a stronger inhibitor of p53 binding than the WF motif when they are both tethered to p53BD by the natural disordered linker. We also investigated how the WW and WF motifs interact with the DNA binding domain (DBD) of p53. Both motifs bind independently to similar sites on DBD that overlap the DNA binding site. Taken together our work defines a model for complex formation between MDMX and p53 where a pair of disordered SLiMs bind overlapping sites on both proteins.
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