Dual gradient ion-exchange chromatography improved refolding yield of lysozyme.
Protein refolding at high concentrations always leads to aggregation, which limits commercial application. An ion-exchange chromatography process with gradient changes in urea concentration and pH was developed to refold denatured lysozyme at high concentration. After adsorption of the denatured protein onto an ion-exchange medium, elution was carried out in combination with a gentle decrease in urea concentration and elevation of pH. Protein would gradually refold along the column with high activity yield. Denatured and reduced lysozyme at 40 mg/ml was loaded into a column filled with SP Sepharose Fast Flow, resulting in 95% activity recovery and 98% mass yield within a short period of time.
State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing.
Ming
M
Li
Guifeng
G
Zhang
Zhiguo
Z
Su
D002852:Chromatography, Ion Exchange / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D009113:Muramidase / Q000737:chemistry*; D020673:Protein Renaturation
D009113:Muramidase