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通过可去除的聚集抑制连接子化学合成Medin蛋白。

Chemical Synthesis of Medin via a Removable Aggregation-Suppressing Linker.

作者信息

De Vleeschouwer Matthias, Pradhan Brajabandhu, Rousseau Frederic, Schymkowitz Joost

机构信息

Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.

Department for Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.

出版信息

J Pept Sci. 2025 Aug;31(8):e70041. doi: 10.1002/psc.70041.

Abstract

Medin, a 50-amino acid fragment derived from the protein MFG-E8 (lactadherin), is the most prevalent amyloid found in humans, present in the vasculature of nearly all individuals over the age of 50. Its biological relevance is highlighted by its co-localization with amyloid-β (Aβ) deposits in both Alzheimer's disease patients and transgenic mice models. Notably, Medin promotes amyloid-β aggregation, forming mixed fibrils with Aβ and enhancing its deposition in blood vessels. Here we report a new and efficient strategy to chemically access this compound. Our approach employs a solubilizing linker that not only ensures high solubility but also suppresses aggregation, allowing efficient purification of the product. The linker can be removed without a trace, after which the product behaves identically to wild-type Medin and forms amyloid fibrils. The synthesis route allows opening up a new chemical space, including nonnatural modifications like biotinylation. Together with the control over the aggregation properties, this is a powerful tool for amyloid protein studies.

摘要

Medin是一种源自蛋白质MFG-E8(乳粘连蛋白)的由50个氨基酸组成的片段,是人类中最普遍存在的淀粉样蛋白,存在于几乎所有50岁以上个体的脉管系统中。它与阿尔茨海默病患者和转基因小鼠模型中的淀粉样β蛋白(Aβ)沉积物共定位,凸显了其生物学相关性。值得注意的是,Medin促进淀粉样β蛋白聚集,与Aβ形成混合纤维并增强其在血管中的沉积。在此,我们报告一种化学合成该化合物的新的高效策略。我们的方法采用一种增溶连接子,它不仅确保高溶解度,还抑制聚集,从而实现产物的高效纯化。该连接子可以完全去除,之后产物的行为与野生型Medin相同并形成淀粉样纤维。该合成路线能够开拓新的化学空间,包括生物素化等非天然修饰。连同对聚集特性的控制,这是淀粉样蛋白研究的一个强大工具。

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引用本文的文献

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Medin drives Aβ40 to adopt Aβ42-like fibril polymorphs in vitro.
bioRxiv. 2025 Jul 20:2025.07.17.665283. doi: 10.1101/2025.07.17.665283.

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