Detection and Characterization of Small Molecule Interactions with Fibrillar Protein Aggregates Using Microscale Thermophoresis.

Detection and Characterization of Small Molecule Interactions with Fibrillar Protein Aggregates Using Microscale Thermophoresis.
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使用微尺度热泳法检测和表征小分子与纤维状蛋白聚集体的相互作用。

DOI:
10.1021/acschemneuro.7b00228
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发表时间:
2017
影响因子:
5
通讯作者:
Fisher E
Fisher E
中科院分区:
医学3区
文献类型:
--
作者:
Fisher E

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帕金森氏症和阿尔茨海默病等神经退行性疾病具有纤维蛋白聚集体的病理特征。通过正电子发射断层扫描(PET)对患者大脑中这些蛋白聚集体的特异性检测可以为诊断和疾病进展提供有价值的信息。然而,识别与纤维蛋白聚集体结合的新的小分子化合物一直是一个挑战。在这项研究中,应用微量热电泳法评估了已知的α-突触核蛋白纤维小分子配体的结合亲和力,并在硫代黄素T荧光竞争试验中进行了平行测试,以进一步验证。此外,还建立了一种用于检测各种小分子与tau纤维相互作用的MST方法。这项研究的结果表明,MST是一种有效和实用的方法来定量小分子和蛋白质纤维聚集体之间的相互作用,这表明它可以用于识别和开发PET放射性配体,并有可能成为蛋白质错折叠疾病的候选治疗药物。
Neurodegenerative diseases such as Parkinson’s and Alzheimer’s disease share the pathological hallmark of fibrillar protein aggregates. The specific detection of these protein aggregates by positron emission tomography (PET) in the patient brain can yield valuable information for diagnosis and disease progression. However, the identification of novel small compounds that bind fibrillar protein aggregates has been a challenge. In this study, microscale thermophoresis (MST) was applied to assess the binding affinity of known small molecule ligands of α-synuclein fibrils, which were also tested in parallel in a thioflavin T fluorescence competition assay for further validation. In addition, a MST assay was also developed for the detection of the interaction between a variety of small molecules and tau fibrils. The results of this study demonstrate that MST is a powerful and practical methodology to quantify interactions between small molecules and protein fibrillar aggregates, which suggests that it can be applied for the identification and development of PET radioligands and potentially of therapeutic candidates for protein misfolding diseases.
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