The inhibitory potential of 4,7-dihydroxycoumarin derivatives on ROS-producing enzymes and direct HOOâ¢/o2⢠- radical scavenging activity - a comprehensive kinetic DFT study.
Free Radic Res
; : 1-16, 2024 Sep 12.
Article
de En
| MEDLINE
| ID: mdl-39264119
ABSTRACT
This study examined the antiradical activity of three synthesized coumarin derivatives (E)-3-(1-((2-hydroxyphenyl)amino)ethylidene)-2,4-dioxochroman-7-yl acetate (A1-OH), (E)-3-(1-((3-hydroxyphenyl)amino)ethylidene)-2,4-dioxochroman-7-yl acetate (A2-OH), and (E)-3-(1-((4-hydroxyphenyl)amino)ethylidene)-2,4-dioxochroman-7-yl acetate (A3-OH) against HOOâ¢/O2â¢- radical species. The investigation included electron spin resonance (ESR) measurements and a DFT kinetic study. Thermodynamic and kinetic parameters of antiradical mechanisms-Formal Hydrogen Atom Transfer (f-HAT), Radical Adduct Formation (RAF), Sequential Proton Loss followed by Electron Transfer (SPLET), and Single-Electron Transfer followed by Proton Transfer (SET-PT)-were evaluated using the Quantum Mechanics-based test for Overall Free Radical Scavenging Activity (QM-ORSA) under physiological conditions. ESR results indicated antiradical activity decreased in the sequence A1-OH (58.7%) > A2-OH (57.5%) > A3-OH (53.1%). Kinetic analysis revealed the f-HAT mechanism dominated HOO⢠inactivation. A newly formulated Sequential Proton Loss followed by Radical Adduct Formation (SPL-RAF) mechanism described interactions with O2â¢-. The activity toward O2â¢- was A2-OH (1.26 × 106 M-1s-1) > A3-OH (7.71 × 105 M-1s-1) > A1-OH (4.22 × 105 M-1s-1). Molecular docking and dynamics studies tested inhibitory capability against enzymes producing reactive species Lipoxygenase (LOX), Myeloperoxidase (MPO), NAD(P)H oxidase (NOX), and Xanthine Oxidase (XOD). Affinity to enzymes decreased in the order XOD > LOX > NOX > MPO.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Free Radic Res
/
Free radic. res
/
Free radical research
Sujet du journal:
BIOQUIMICA
Année:
2024
Type de document:
Article
Pays de publication:
Royaume-Uni