Bert L H Beerkens, Vasiliki Andrianopoulou, Xuesong Wang, Rongfang Liu, Gerard J P van Westen, Willem Jespers, Adriaan P IJzerman, Laura H Heitman, Daan van der Es
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引用次数: 0
摘要
小分子工具化合物在研究 G 蛋白偶联受体(GPCR)方面发挥着重要作用。然而,工具化合物通常占据正交结合位点,妨碍了配体结合后 GPCR 的研究。为了克服这一问题,人们开发了配体定向标记技术,这种技术能使报告基团与 GPCR 共价结合,同时允许随后的正交配体结合。在这项研究中,我们将这种标记策略应用于腺苷 A2B 受体(A2BAR)。我们将最近报道的 N-酰基-N-烷基磺酰胺(NASA)弹头合成到之前开发的配体中,结果表明 A2BAR 的结合不受 NASA 结合的限制。此外,我们还使用 SDS-PAGE、流式细胞仪和质谱技术研究了配体对 A2BAR 的定向标记。我们发现合成的探针之一能特异性标记 A2BAR,但检测受到非特异性蛋白质标记的阻碍,这很可能是由于 NASA 弹头的内在反应性造成的。总之,这项工作有助于今后开发用于检测 GPCR 的配体定向探针。
N-Acyl-N-Alkyl Sulfonamide Probes for Ligand-Directed Covalent Labeling of GPCRs: The Adenosine A2B Receptor as Case Study.
Small molecular tool compounds play an essential role in the study of G protein-coupled receptors (GPCRs). However, tool compounds most often occupy the orthosteric binding site, hampering the study of GPCRs upon ligand binding. To overcome this problem, ligand-directed labeling techniques have been developed that leave a reporter group covalently bound to the GPCR, while allowing subsequent orthosteric ligands to bind. In this work, we applied such a labeling strategy to the adenosine A2B receptor (A2BAR). We have synthetically implemented the recently reported N-acyl-N-alkyl sulfonamide (NASA) warhead into a previously developed ligand and show that the binding of the A2BAR is not restricted by NASA incorporation. Furthermore, we have investigated ligand-directed labeling of the A2BAR using SDS-PAGE, flow cytometric, and mass spectrometry techniques. We have found one of the synthesized probes to specifically label the A2BAR, although detection was hindered by nonspecific protein labeling most likely due to the intrinsic reactivity of the NASA warhead. Altogether, this work aids the future development of ligand-directed probes for the detection of GPCRs.
期刊介绍:
ACS Chemical Biology provides an international forum for the rapid communication of research that broadly embraces the interface between chemistry and biology.
The journal also serves as a forum to facilitate the communication between biologists and chemists that will translate into new research opportunities and discoveries. Results will be published in which molecular reasoning has been used to probe questions through in vitro investigations, cell biological methods, or organismic studies.
We welcome mechanistic studies on proteins, nucleic acids, sugars, lipids, and nonbiological polymers. The journal serves a large scientific community, exploring cellular function from both chemical and biological perspectives. It is understood that submitted work is based upon original results and has not been published previously.