title: Identifying the antiasthmatic target of doxofylline using immobilized β2 -adrenoceptor based high-performance affinity chromatography and site-directed molecular docking.
abstract: As a xanthine derivative, doxofylline is believed to be dominant for fighting against asthma in practice. Unlike other xanthines, the antiasthmatic effects of doxofylline lack any definite proof of target and mediating mechanism according to previous reports. In this work, the interaction between doxofylline and β2 -AR was investigated by high performance affinity chromatography using frontal analysis and nonlinear model. The methodology involved the immobilization of β2 -AR on the silica gel by a random linking method, the determination of the binding parameters by frontal analysis and nonlinear chromatography and the exploration of the binding mechanism by site-directed molecular docking. The association constant for doxofylline binding to immobilized β2 -AR was determined to be 7.70 × 10(4)  M(-1) by nonlinear chromatography and 5.91 × 10(4)  M(-1) by frontal analysis. Ser(169) and Ser(173) were the binding sites for the receptor-drug interaction on which hydrogen bond was believed to be the main driven force during the interaction. These results indicated that the antiasthmatic effects of doxofylline may be behind the mediating mechanism of β2 -AR. High performance affinity chromatography based on immobilized receptor has potential to become an alternative for drug target confirmation and drug-receptor interaction analysis. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, 710069, China. zhangyj@nwu.edu.cn.
authors.forename: Yajun
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, 710069, China.
authors.forename: Kaizhu
authors.initials: K
authors.lastname: Zeng
authors.affiliation: Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, 710069, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, 710069, China.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Gao
authors.affiliation: College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, 710065, China.
authors.forename: Yefei
authors.initials: Y
authors.lastname: Nan
authors.affiliation: Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, 710069, China.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Zheng
mesh_terms: D000818:Animals; D018927:Anti-Asthmatic Agents / Q000737:chemistry / Q000494:pharmacology*; D001665:Binding Sites; D002846:Chromatography, Affinity; D006860:Hydrogen Bonding; D008958:Models, Molecular; D062105:Molecular Docking Simulation; D011485:Protein Binding; D018343:Receptors, Adrenergic, beta-2 / Q000737:chemistry* / Q000378:metabolism*; D012694:Serine / Q000378:metabolism; D034421:Sus scrofa; D013806:Theophylline / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology
chemical_list: D018927:Anti-Asthmatic Agents; D018343:Receptors, Adrenergic, beta-2; D012694:Serine; D013806:Theophylline; C029797:doxofylline