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Real-time label-free characterization of oligosaccharide-binding proteins using carbohydrate microarrays and an ellipsometry-based biosensor

机译:使用碳水化合物微阵列和基于椭偏仪的生物传感器对寡糖结合蛋白进行实时无标记的表征

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摘要

Carbohydrates present on cell surfaces mediate cell behavior through interactions with other biomolecules. Due to their structural complexity, diversity, and heterogeneity, it is difficult to fully characterize a variety of carbohydrates and their binding partners. As a result, novel technologies for glycomics applications have been developed, including carbohydrate microarrays and label-free detection methods. In this paper, we report using the combination of oligosaccharide microarrays and the label-free oblique-incidence reflectivity difference (OI-RD) microscopy for real-time characterization of oligosaccharide binding proteins. Aminated human milk oligosaccharides were immobilized on epoxy-coated glass substrates as microarrays for reactions with Family 1 of solute binding proteins from Bifidobacterium longum subsp. infantis (B. infantis). Binding affinities of these protein-oligosaccharide interactions showed preferences of Family 1 of solute binding proteins to host glycans, which helps in characterizing the complex process of human milk oligosaccharides foraging by B. infantis.
机译:存在于细胞表面的碳水化合物通过与其他生物分子的相互作用介导细胞行为。由于它们的结构复杂性,多样性和异质性,很难完全表征各种碳水化合物及其结合伴侣。结果,已经开发出用于糖组学应用的新技术,包括碳水化合物微阵列和无标记检测方法。在本文中,我们报道了结合使用寡糖微阵列和无标记斜入射反射率差异(OI-RD)显微镜对寡糖结合蛋白进行实时表征的方法。将胺化的人乳寡糖固定在环氧树脂涂层的玻璃基板上,作为微阵列,用于与长双歧杆菌亚种的溶质结合蛋白家族1进行反应。婴儿(婴儿B.)这些蛋白质-寡糖相互作用的结合亲和力显示出溶质结合蛋白家族1对宿主聚糖的偏好,这有助于表征婴儿乳杆菌觅食人乳寡糖的复杂过程。

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