摘要
The conditions (temperature, time, pH) for solubilizing inclusion bodies of prochymosin mutant, Cys45Asp/Cys50Ser, are identical with those for the wild type. Moreover, they have similar oxidative refolding behavior. Under the same renaturation conditions both of them can undergo correct refolding leading to the formation of activable molecules. This is quite different from the mutant with deletion of Cys250-Cys283, indicating that Cys45-Cys50 contributes less to the correct refolding of prochymosin than Cys250- Cys283. However, deletion of Cys45-Cys50 results in a remarkable decrease of the thermostability of pseudochymosin, suggesting that this disulfide bond plays an important role in stabilizing enzyme conformation. The proteolytic (P) and milk-dotting (C) activities of the mutant of pseudochymosin, Cys45Asp/Cys50Ser, are lower than those of its wild counterpart. The C/P ratio of the former is onefold higher than that of the latter.
The conditions (temperature, time, pH) for solubilizing inclusion bodies of prochymosin mutant, Cys45Asp/Cys50Ser, are identical with those for the wild type. Moreover, they have similar oxidative refolding behavior. Under the same renaturation conditions both of them can undergo correct refolding leading to the formation of activable molecules. This is quite different from the mutant with deletion of Cys250-Cys283, indicating that Cys45-Cys50 contributes less to the correct refolding of prochymosin than Cys250- Cys283. However, deletion of Cys45-Cys50 results in a remarkable decrease of the thermostability of pseudochymosin, suggesting that this disulfide bond plays an important role in stabilizing enzyme conformation. The proteolytic (P) and milk-dotting (C) activities of the mutant of pseudochymosin, Cys45Asp/Cys50Ser, are lower than those of its wild counterpart. The C/P ratio of the former is onefold higher than that of the latter.
基金
Project supported by the National High Technology Programme.
