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Copper-induced oligomerization of peptides: a model study

机译:铜诱导的肽寡聚:模型研究

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In this work, copper-binding of the tetraglycine peptide (Gly-Gly-Gly-Gly) was studied by electrospray ionization mass spectrometry. Experiments were performed under alkaline conditions, in the presence of ethanolamine (pH 10.95). We observed that the presence of copper(II) ions induces the aggregation of the peptide and the formation of copper-bound complexes with higher molecular mass is favored, such as the oligomer complexes [3M+2Cu-3H](+) and [4M+3Cu-5H](+). At 1:1 peptide-copper(II) ion ratio, the singly charged [3M+2Cu-3H](+) oligomer complex is the base peak in the mass spectrum. Metal ion-induced oligomerization of neurotoxic peptides is well known in the literature; however, there are very few examples in which such oligomerization was directly observed by mass spectrometry. Our results show that application of short peptides can be useful to study the mechanism of metal ion binding and metal ion-induced oligomerization of peptides.
机译:在这项工作中,通过电喷雾电离质谱研究了四甘氨酸肽(Gly-Gly-Gly-Gly)的铜结合。在碱性条件下,在乙醇胺(pH 10.95)存在下进行实验。我们观察到铜(II)离子的存在会诱导肽的聚集,并且倾向于形成分子量更高的铜结合复合物,例如低聚物复合物[3M + 2Cu-3H](+)和[4M + 3Cu-5H](+)。在1:1的肽-铜(II)离子比率下,单电荷[3M + 2Cu-3H](+)低聚物络合物是质谱中的基峰。金属离子诱导的神经毒性肽的寡聚在文献中是众所周知的。然而,很少有通过质谱法直接观察到这种低聚的例子。我们的结果表明,短肽的应用可用于研究金属离子结合和金属离子诱导的肽寡聚化的机理。

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