Multi-target bioactive compound screening from the infructescence of Platycarya strobilacea Sieb. et Zucc. by affinity chromatography using immobilized β2 -adrenoceptor and muscarinic-3 acetylcholine receptor as the stationary phase

Discovering the Bioactive Compounds Binding to α1A-Adrenergic Receptor in Guizhi Fuling Formula and Revealing Their Interactions by Immobilizing the Receptor Through Colicin L7 DNase/Immunity Protein 7 Ultra-Affinity System

In this work, Guizhi Fuling Formula (GFF), as well as α1A-adrenergic receptor (α1A-AR) were taken as the research objects. By utilizing the ultra-affinity between Colicin L7 DNase (CL7) and its homologous immune protein 7 (Im7), CL7-tagged α1A-AR was oriented immobilized to the Im7-coated silica gel surface. With the α1A-AR immobilized column in hand, the active compounds in GFF targeted to α1A-AR were screened, and the binding procedures were analyzed. The composite characterization demonstrated that the α1A-AR can be immobilized to the chromatographic stationary phase with good specificity and stability in 3 weeks. Paeoniflorin, cinnamic acid, and paeonol were identified as the active compounds in GFF targeted to α1A-AR. Among them, cinnamic acid and paeonol have the same binding site on α1A-AR as the specific drug tamsulosin. The binding parameters obtained by frontal analysis and injection amount-dependent analysis were consistent in the same concentration range. Collectively, these results indicated that the α1A-AR chromatographic column synthesized by a novel immobilized method was capable of screening and analyzing the functional compounds from the complex matrix, which provided an alternative for rapid screening and analysis to traditional ethnic drugs.

Revealing the anti-inflammatory ingredients in wine-processed Radix et Rhizoma Rhei using immobilized cysteinyl leukotriene receptor type 1 as the stationary phase

Despite the tremendous progress of wine-processed Radix et Rhizoma Rhei (Jiudahuang, JDH) in removing toxic heat from the blood in the upper portion of the body for hundreds of years, the deep understanding of its functional material basis of the anti-inflammatory ingredients remains unclear due to the lack of high specific and efficient methods. Herein, taking Cysteinyl leukotriene receptor type 1(CysLT1R) as the target protein, we established a chromatographic method based on the immobilized CysLT1R using haloalkane dehalogenases (Halo) at the C-terminus of the receptor in one step. After careful characterization by X-ray photoelectronic spectroscopy, immune-fluorometric analysis, and chromatographic investigations, the immobilized receptor was used to screen the anti-inflammatory ingredients in JDH. Aloe-emodin, rhein, emodin, chrysophanol, and physcion were identified as the main anthraquinone exerting anti-inflammatory effects in the drug. The association constants for the five compounds to bind with the receptor were calculated as (0.30 ± 0.06)× 105, (0.35 ± 0.03)× 105, (0.46 ± 0.05)× 105, (1.05 ± 0.14)× 105, and (1.66 ± 0.17)× 105 M-1 by injection amount-dependent method. Meanwhile, hydrogen bonds were identified as the main driving force for the five compounds to bind with CysLT1R by molecular docking. Based on these results, we believe that the immobilized receptor chromatography preserves historic significance in revealing the functional material basis of the complex matrices.