Determining the Binding Sites of β-Cyclodextrin and Peptides by Electron-Capture Dissociation High Resolution Tandem Mass Spectrometry

Determining the Binding Sites of β-Cyclodextrin and Peptides by Electron-Capture Dissociation High Resolution Tandem Mass Spectrometry
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通过电子捕获解离高分辨率串联质谱测定β-环糊精和肽的结合位点

DOI:
10.1007/s13361-015-1118-x
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发表时间:
2015
影响因子:
3.2
通讯作者:
Volmer DA
Volmer DA
中科院分区:
化学3区
文献类型:
--
作者:
Geib T;Volmer DA

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环糊精(CD)是一组环状寡糖,很容易与疏水性化合物形成包合物以提高生物利用度,从而使CD成为理想的药物赋形剂。最近的研究还表明,CD 表现出广泛的保护作用,可防止蛋白质聚集、降解和折叠。这些效应很大程度上取决于蛋白质表面的结合位点。然而,CD仅与氨基酸表现出微弱的相互作用;因此,传统的分析技术通常无法揭示结合位点的确切位置。此外,一些研究甚至表明CD包合物仅仅是静电加合物。在这里,电子捕获解离 (ECD) 被应用于这项概念验证研究中,以检查 CD/肽复合物的确切性质,并且首次通过傅里叶变换离子回旋共振 (FTICR) 串联质谱法明确定位了 CD 结合位点。
Cyclodextrins (CDs) are a group of cyclic oligosaccharides, which readily form inclusion complexes with hydrophobic compounds to increase bioavailability, thus making CDs ideal drug excipients. Recent studies have also shown that CDs exhibit a wide range of protective effects, preventing proteins from aggregation, degradation, and folding. These effects strongly depend on the binding sites on the protein surface. CDs only exhibit weak interactions with amino acids, however; conventional analytical techniques therefore usually fail to reveal the exact location of the binding sites. Moreover, some studies even suggest that CD inclusion complexes are merely electrostatic adducts. Here, electron capture dissociation (ECD) was applied in this proof-of-concept study to examine the exact nature of the CD/peptide complexes, and CD binding sites were unambiguously located for the first timeviaFourier-transform ion cyclotron resonance (FTICR) tandem mass spectrometry.
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