Surface-Based and Mass Spectrometric Approaches to Deciphering Sugar–Protein Interactions in a Galactose-Specific Agglutinin
作者:Carmen Jiménez-Castells、Sira Defaus、Adrian Moise、Michael Przbylski、David Andreu、Ricardo Gutiérrez-Gallego
DOI:10.1021/ac300766z
日期:2012.8.7
Interest in powerful, nanosized tools to analyze in detail glycan–protein interactions has increased significantly over recent years. Here, we report two complementary approaches to characterize such interactions with high sensitivity, low sample consumption, and without the need for sample labeling, namely, surface plasmon resonance (SPR) and an approach that combines limited proteolysis and mass spectrometry. Combination of these two approaches to investigate glycan–protein interactions allows (1) to characterize interactions through kinetic and thermodynamic parameters, (2) to capture efficiently the carbohydrate-binding protein, and (3) to identify the interacted protein and its carbohydrate binding site by mass spectrometry. As a proof of principle, the interaction of the galactose-specific legume lectin Erythrina cristagalli agglutinin with several sugars has been characterized in-depth by means of these two approaches.
近年来,人们对详细分析糖蛋白相互作用的强大纳米级工具的兴趣显著增加。在这里,我们报告了两种互补的方法,即表面等离子体共振(SPR)和一种结合了有限蛋白水解和质谱的方法,这两种方法都能以高灵敏度、低样品消耗和无需样品标记来表征这种相互作用。将这两种方法结合起来研究聚糖与蛋白质的相互作用可以:(1)通过动力学和热力学参数描述相互作用的特征;(2)有效捕获碳水化合物结合蛋白;(3)通过质谱鉴定相互作用的蛋白质及其碳水化合物结合位点。作为原理验证,我们通过这两种方法深入研究了半乳糖特异性豆科凝集素 Erythrina cristagalli agglutinin 与多种糖类的相互作用。