Lysozyme refolding with immobilized GroEL column chromatography

被引:38
作者
Dong, XY [1 ]
Yang, H [1 ]
Sun, Y [1 ]
机构
[1] Tianjin Univ, Dept Biochem Engn, Tianjin 300072, Peoples R China
基金
中国国家自然科学基金;
关键词
immobilized chaperonins; lysozyme; proteins;
D O I
10.1016/S0021-9673(00)00297-1
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
A refolding chromatography with immobilized molecular chaperonin GroEL was studied for the reactivation of denatured-reduced lysozyme. The effect of denaturant concentration (guanidine hydrochloride, 0.1-1.5 M) in the elution buffer, the elution how-rate, and the loading concentration and volume of the substrate protein on the reactivation yield was studied. All the operating parameters showed minor effects on the recovery yield of lysozyme mass, which remained at 90-100%, but exhibited relatively notable influences on the specific activity of the recovered lysozyme. For example, there existed an optimum denaturant concentration of about 1 M at which the highest yield of specific activity (up to 97%) was obtained. Using the immobilized GroEL column, 3 mi of the lysozyme (1 mg/ml) per batch could be refolded at an overall yield of 81%, which corresponded to a refolding productivity of 54 mg per 1 gel per h. At comparable reactivation yields (over 80%), this value of productivity was over four-times larger as that of the size-exclusion refolding chromatography reported previously (12 mg per l gel per h), indicating the advantage of the present system for producing a high throughput in protein refolding operations. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:197 / 204
页数:8
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