Fluorescence quenching study on the interaction between quercetin and lipoxygenase

Area of Science:

• Biochemistry
• Molecular Biology
• Spectroscopy

Background:

• Lipoxygenase is a key enzyme in inflammatory pathways.
• Quercetin, a flavonoid, exhibits anti-inflammatory properties.
• Understanding their interaction is crucial for therapeutic development.

Purpose of the Study:

• To investigate the molecular interaction between quercetin and lipoxygenase.
• To elucidate the binding mechanism and thermodynamic parameters.
• To determine the structural consequences of quercetin binding on lipoxygenase.

Main Methods:

• Fluorescence spectroscopy was employed to study the interaction.
• Emission quenching analysis at varying temperatures was performed.
• Förster's non-radiative energy transfer theory was applied to calculate binding distance.

Main Results:

• Fluorescence quenching indicated a static quenching mechanism, forming a quercetin-lipoxygenase complex.
• Thermodynamic parameters (ΔG, ΔH, ΔS) suggest hydrophobic forces stabilize the complex.
• Calculated binding distance between quercetin and lipoxygenase was 3.84 nm.
• Three-dimensional fluorescence spectra revealed conformational changes in lipoxygenase upon quercetin binding.

Conclusions:

• Quercetin binds to lipoxygenase via hydrophobic interactions, forming a stable complex.
• The binding event induces significant conformational modifications in the lipoxygenase structure.
• These findings provide molecular insights into the anti-inflammatory action of quercetin.