Abstract

Thermal inactivation and unfolding of the dimeric arginine kinase (AK) from sea cucumber Stichopus japonicus was investigated. The activation energy was calculated to be 388 kJ/mol. Based on the analysis of the denaturation course at 58°C, a model is suggested for the thermal unfolding of this dimeric AK. In addition, the effect of free Mg2+ and the potential biological significance on the thermal unfolding of dimeric AK is discussed.

Keywords: arginine kinase, thermal denaturation, inactivation, mg, unfolding, fluorescence, fast performance liquid chromatography, differential scanning calorimetry