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Molecular Mechanism of the Pin1-Histone H1 Interaction

机译:PIN1-组蛋白H1相互作用的分子机制

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摘要

Pin1 is an essential peptidyl-prolyl isomerase (PPIase) that catalyzes cis-trans prolyl isomerization in proteins containing pSer/Thr-Pro motifs. It has an N-terminal WW domain that targets these motifs and a C-terminal PPIase domain that catalyzes isomerization. Recently, Pin1 was shown to modify the conformation of phosphorylated histone HI and stabilize the chromatin-H1 interaction by increasing its residence time. This Pin1-histone H1 interaction plays a key role in pathogen response, in infection, and in cell cycle control; therefore, anti-Pin1 therapeutics are an important focus for treating infections as well as cancer. Each of the H1 histones (H1.0-H1.5) contains several potential Pin1 recognition pSer/pThr-Pro motifs. To understand the Pin1-histone H1 interaction fully, we investigated how both the isolated WW domain and full-length Pin1 interact with three H1 histone substrate peptide sequences that were previously identified as important binding partners (H1.1, H1.4, and H1.5). NMR spectroscopy was used to measure the binding affinities and the interdomain dynamics upon binding to these sequences. We observed different K-D values depending on the histone binding site, suggesting that energetics play a role in guiding the Pin1-histone interaction. While interdomain interactions vary between the peptides, we find no evidence for allosteric activation for the histone H1 substrates.
机译:PIN1是催化肽在含有PSER / THR-PRO基序的蛋白质中的CIS-Trans脯氨酰异构化的必需肽基 - 脯氨酰异构酶(PPIASE)。它具有N末端WW域,其针对这些图案和催化异构化的C末端PPIASE结构域。最近,PIN1被显示为改变磷酸化组蛋白HI的构象,并通过增加其停留时间来稳定染色质-H1相互作用。该PIN1-组蛋白H1相互作用在病原体反应中发挥关键作用,感染和细胞周期控制;因此,抗PIN1治疗剂是治疗感染以及癌症的重要关注。 H1组蛋白(H1.0-H1.5)中的每一个包含几个电位PIN1识别普通/ PTHR-PRO图案。为了了解Pin1-组蛋白H1相互作用,我们研究了分离的WW结构域和全长PIN1如何与先前鉴定为重要结合伴侣(H1.1,H1.4和H1的三个H1组蛋白基质肽序列。 .5)。使用NMR光谱法测量与这些序列结合时的结合亲和力和互补动力学。根据组蛋白绑定站点,我们观察到不同的K-D值,表明能量学在引导PIN1和组蛋白相互作用方面发挥作用。虽然蛋白质之间的互补相互作用在肽之间变化,但没有发现组蛋白H1基板的变构激活的证据。

著录项

  • 来源
    《Biochemistry》 |2019年第6期|共11页
  • 作者单位

    Mississippi State Univ Dept Chem Mississippi State MS 39762 USA;

    Mississippi State Univ Dept Chem Mississippi State MS 39762 USA;

    Univ Waterloo Dept Chem Waterloo ON N21 3G1 Canada;

    Mississippi State Univ Dept Chem Mississippi State MS 39762 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物化学;
  • 关键词

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