受体
化学
聚糖
费斯特共振能量转移
细胞表面受体
G蛋白偶联受体
生物物理学
配体(生物化学)
共域化
药物发现
生物化学
细胞生物学
荧光
糖蛋白
生物
物理
量子力学
作者
Henning Stöckmann,Viktor Todorović,Paul L. Richardson,Violeta L. Marin,Victoria Scott,C. Gerstein,Marc Lake,Leyu Wang,Ramkrishna Sadhukhan,Anil Vasudevan
摘要
Ligand-binding assays are the linchpin of drug discovery and medicinal chemistry. Cell-surface receptors and their ligands have traditionally been characterized by radioligand-binding assays, which have low temporal and spatial resolution and entail safety risks. Here, we report a powerful alternative (GlycoFRET), where terbium-labeled fluorescent reporters are irreversibly attached to receptors by metabolic glycan engineering. For the first time, we show time-resolved fluorescence resonance energy transfer between receptor glycans and fluorescently labeled ligands. We describe GlycoFRET for a GPI-anchored receptor, a G-protein-coupled receptor, and a heterodimeric cytokine receptor in living cells with excellent sensitivity and high signal-to-background ratios. In contrast to previously described methods, GlycoFRET does not require genetic engineering or antibodies to label receptors. Given that all cell-surface receptors are glycosylated, we expect that GlycoFRET can be generalized with applications in chemical biology and biotechnology, such as target engagement, receptor pharmacology, and high-throughput screening.
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