Decoding the interaction of an imidazo-pyrimidine derivative with serum proteins: Spectroscopic, computational and...

Area of Science:

• Biochemistry
• Molecular Biology
• Spectroscopy

Background:

• Serum proteins like Human Serum Albumin (HSA) and Bovine Serum Albumin (BSA) are crucial drug carriers.
• Understanding drug-protein interactions is vital for pharmacokinetics and drug development.
• Novel compounds require thorough characterization of their binding behavior with biomolecules.

Purpose of the Study:

• To investigate the structure-function relationship of a novel imidazo pyrimidine derivative (IPD).
• To analyze the binding interactions of IPD with HSA and BSA using spectroscopic methods.
• To elucidate the binding mechanism and affinity differences between IPD-HSA and IPD-BSA complexes.

Main Methods:

• Steady-state fluorometric investigations to study binding.
• Fluorescence enhancement studies in polar vs. non-polar environments.
• Denaturation and quenching studies to confirm binding affinity.
• In silico molecular docking simulations to predict binding sites and interactions.

Main Results:

• IPD exhibits minimal fluorescence in polar environments but significant enhancement in non-polar protein mediums.
• Strong binding interactions were observed between IPD and both HSA and BSA.
• IPD demonstrated a higher binding affinity for HSA compared to BSA.
• Spectroscopic and molecular docking results consistently indicated stronger IPD-HSA complexation.

Conclusions:

• IPD is a promising fluorescent probe for studying serum protein interactions.
• The preferential binding of IPD to HSA is attributed to its localization within a more hydrophobic pocket.
• Enhanced π and alkyl interactions in HSA contribute to the higher binding affinity compared to BSA.