Thermally Stable Schiff Base and its Metal Complexes: Molecular Docking and Protein Binding Studies

Area of Science:

• Biochemistry
• Chemical Biology
• Materials Science

Background:

• Schiff bases and their metal complexes are versatile compounds with potential biological applications.
• Bovine serum albumin (BSA) is a key protein in biological systems, often used as a model for protein-ligand interactions.
• Understanding ligand-protein interactions is crucial for drug design and understanding biological processes.

Purpose of the Study:

• To investigate the interaction mechanism between Schiff base ligands, their metal complexes (iron and copper), and bovine serum albumin (BSA).
• To elucidate the binding modes, thermodynamic parameters, and the influence of metal ions on these interactions.
• To explore the potential of these compounds as fluorescent probes or therapeutic agents.

Main Methods:

• UV-vis absorption spectroscopy to monitor spectral changes upon binding.
• Fluorescence spectroscopy to assess quenching mechanisms and binding constants.
• Molecular docking simulations to predict binding sites and interactions.
• Thermodynamic analysis to determine binding parameters (ΔG, ΔH, ΔS).

Main Results:

• Fluorescence intensity of BSA decreased in the presence of ligands, indicating a static quenching mechanism.
• Binding constants (KSV, Kbin, Ka) and thermodynamic parameters were determined.
• Negative ΔG values (-6.3 to -5.5 kcal/mol) signify spontaneous binding.
• Positive ΔH and ΔS values suggest endothermic binding and electrostatic interactions as primary forces.

Conclusions:

• Schiff base ligands and their metal complexes bind spontaneously to BSA.
• Hydrogen bonding and van der Waals forces are the main modes of interaction.
• The presence of metal ions (iron, copper) influences the binding properties.
• These findings provide insights into the molecular interactions relevant for biochemical and pharmacological studies.