Spectroscopic study on the interaction of catalase with bifendate and analogs

Catalase and its mysteries

Catalase is one of the firsts in every realm of biological sciences. At the same time it also has a number of unusual features. It has one of the highest turnover numbers of all enzymes. It is essential for neutralizing the noxious hydrogen peroxide both in the nature and the various industries such as dairy, textile and pharmaceutics. It also has the merit of being one of the first protein crystals to be isolated. Ironically its three-dimensional structure was discerned some forty years later. However through the times this senile enzyme has continued to intrigue the scientists by surprising facts and phenomena, such as peculiar interweaving of subunits and remarkable thermal stability. It is also known for suicide inactivation by its own substrate. Catalase is known to be implicated in various medical scenarios and its levels have served as a marker in that capacity. It has even been incorporated into several pharmaceuticals. This review strives to clarify these perspectives. It also draws attention to the biophysical contributions offered by thermodynamics and kinetics in these discoveries. The ultimate aim of this review, however, is to state that the venerable catalase will continue to bewilder us with its mysteries well into the twenty-first century.

Comparative study of the binding of 3 flavonoids to the fat mass and obesity-associated protein by spectroscopy and molecular modeling

This study aims to investigate the interaction between 3 flavonoids (quercetin, apigenin, and naringenin) and fat mass and obesity-associated protein by fluorescence, ultraviolet-visible absorption spectroscopy, and molecular modeling. Results indicate that the intrinsic fluorescence of fat mass and obesity-associated protein can be quenched by the 3 flavonoids through a static quenching procedure. Thermodynamic analysis and molecular modeling results suggest that hydrophobic interaction and hydrogen bond forces play the major roles in the binding process. Moreover, results also show that the rank order of quenching constant and binding constant is quercetin > apigenin > naringenin.

Study on the interaction between bovine serum albumin and 4'-azido-2'-deoxyfluoroarabinocytidine or analogs by spectroscopy and molecular modeling

The binding of 4'-azido-2'-deoxyfluoroarabinocytidine (FNC) or analogs (cytidine and 5'-cytidylate monophosphate) to bovine serum albumin (BSA) was investigated by fluorescence, UV-vis absorption spectroscopy and molecular modeling. The three compounds quenched the intrinsic fluorescence of BSA and the results revealed the presence of static quenching mechanism. The positive ΔH and positive ΔS for the systems suggested that the hydrophobic forces stabilized the interaction between the compounds and protein. Results also showed that FNC was the weakest quencher.