Stepwise Frontal Analysis Coupled with Affinity Chromatography: A Fast and Reliable Method for Potential Ligand Isolation and Evaluation from Mahuang‐Fuzi‐Xixin Decoction

Abstract

Mahuang-Fuzi-Xixin Decoction (MFXD) is widely used in the treatment of asthma, however, the functional components in the decoction targeting beta2-adrenoceptor (β 2 -AR) remain unclear. Herein, we immobilized the haloalkane dehalogenase (Halo)-tagged β 2 -AR on the 6-chlorocaproic acid-modified microspheres. Using the affinity stationary phase, the interactions of four ligands with the receptor were analyzed by stepwise frontal analysis. The association constants were (4.75 � 0.28) × 10 4 M À 1 for salbutamol, (2.93 � 0.15) × 10 4 M À 1 for terbutaline, (1.23 � 0.03) × 10 4 M À 1 for methoxyphenamine, (5.67 � 0.38) × 10 4 M À 1 for clorprenaline at highaffinity binding site, and (2.73 � 0.05) × 10 3 M À 1 at low-affinity binding site. These association constants showed the same rank order as the radioligand binding assay, demonstrating that immobilized β 2 -AR had capacity to screen bioactive compounds binding to the receptor while stepwise frontal analysis could predict their binding affinities. Application of the immobilized receptor in analysis of MFXD by chromatographic method revealed that ephedrine, aconifine, karakoline, and chasmanine were the bioactive compounds targeting β 2 -AR. Among them, ephedrine and chasmanine exhibited association constants of (2.94 � 0.02) × 10 4 M -1 and (4.60 � 0.15) × 10 4 M À 1 to the receptor by stepwise frontal analysis. Molecular docking analysis demonstrated that ephedrine, chasmanine, and the other two compounds interact with β 2 -AR through the same pocket involving the key amino acids such as Asn312, Asp113, Phe289, Trp286, Tyr316, and Val114. As such, we reasoned that the four compounds dominate the therapeutic effect of MFXD against asthma through β 2 -AR mediating pathway. This work shed light on the potential of immobilized β 2 -AR for drug discovery and provided a valuable methodology for rapid screening.

Research on quality marker based on the processing from Aconiti lateralis radix praeparata to Heishunpian

“…Karakoline, talatizidine, fuziline, bullatine B, and talatisamine belong to the category of alcohol‐amine diterpenoid alkaloids. According to research, karakoline was the bioactive compound targeting beta2‐adrenoceptor 64 . Talatizidine had good anti‐inflammatory effects and was considered to be the main bioactive compound of Wutou Decoction against rheumatoid arthritis 65 .…”

“…According to research, karakoline was the bioactive compound targeting beta2-adrenoceptor. 64 Talatizidine had good anti-inflammatory effects and was considered to be the main bioactive compound of Wutou Decoction against rheumatoid arthritis. 65 The anti-inflammatory, analgesic, and cardiac protective activity of fuziling and C 20 terpenoid alkaloid songorine had been confirmed.…”