Ligand-specific conformational change drives interdomain allostery in Pin1.

Ligand-specific conformational change drives interdomain allostery in Pin1.
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配基特异性的构象变化驱动Pin1的结构域间变构。

DOI:
10.1038/s41467-022-32340-x
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发表时间:
2022-08-04
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
文献类型:
--
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Pin1是一种两个结构域的细胞调节因子,可以异构化多肽-脯氨酸。催化结构域(PPIase)和另一个配体结合结构域(WW)样品的构象延长而致密。配体结合改变了结构域间构象的平衡,但导致改变结构域采样的构象变化尚不清楚。先前的证据支持结构域间变构机制。我们最近引入了一种基于磁共振的协议,使我们能够确定apo Pin1中结构域内和域间结构采样的耦合。在这里,我们描述了当pCDC25c和FFpSPR结合时发生的配体特异性构象变化。与apo和FFpSPR结合形式的几乎相同的种群相比,pCDC25c结合使扩展态的种群翻了一番。PCDC25c与WW结构域的结合触发构象变化通过结构域间界面传播到催化位点,而FFpSPR结合取代PPIase中的螺旋,导致PPIase催化环的重新定位。Born等人。描述两个配体结合时两个结构域肽-脯氨酰异构酶Pin1中的域间变构。这些配体将扩展态和紧凑态的布居转移与Pin1的催化位置的变化相结合。
Pin1 is a two-domain cell regulator that isomerizes peptidyl-prolines. The catalytic domain (PPIase) and the other ligand-binding domain (WW) sample extended and compact conformations. Ligand binding changes the equilibrium of the interdomain conformations, but the conformational changes that lead to the altered domain sampling were unknown. Prior evidence has supported an interdomain allosteric mechanism. We recently introduced a magnetic resonance-based protocol that allowed us to determine the coupling of intra- and interdomain structural sampling in apo Pin1. Here, we describe ligand-specific conformational changes that occur upon binding of pCDC25c and FFpSPR. pCDC25c binding doubles the population of the extended states compared to the virtually identical populations of the apo and FFpSPR-bound forms. pCDC25c binding to the WW domain triggers conformational changes to propagate via the interdomain interface to the catalytic site, while FFpSPR binding displaces a helix in the PPIase that leads to repositioning of the PPIase catalytic loop. Born et al. describe interdomain allostery in the two domain peptidyl-prolyl isomerase Pin1 upon binding of two ligands. These ligands couple population shifts of extended and compact states to changes in the catalytic site of Pin1.
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