Analysis of the binding mechanism between o-phenylenediamine and bovine hemoglobin by molecular spectroscopy and molecular modeling methods

This study was aimed to reveal the binding mechanism between bovine hemoglobin and o-phenylenediamine by using molecular spectroscopy techniques and molecular modeling methods. The experimental results revealed that the fluorescence quenching mechanism was a combined dynamic and static quenching. The binding constant was (1.17 ± 0.02)×104 L/mol, and only a single binding site exists. The binding distance was 2.46 nm. The binding process was a spontaneous reaction, dominated by hydrophobic forces. The molecular docking simulations have also confirmed the results of the spectroscopic methods. The results reported here may significantly help understanding the interaction mechanism of o-phenylenediamine and hemoglobin.