Abstract

The crystallization behaviour of the highly thermostable glucose isomerase from the Streptomyces sp. strain isolated from Tunisian soil was investigated using ammonium sulfate as a precipitating agent. We established phase diagrams at different temperatures and protein concentrations. It was found that the solubility increased with increasing temperature and decreased with increasing salt concentration. The temperature-dependent solubility was used to characterize the thermodynamic parameters of crystallization such as enthalpy, entropy and free energy.

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