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Improved protein refolding using hollow-fibre membrane dialysis
S M West1, J B Chaudhuri, J A Howell
1Department of Chemical Engineering, University of Bath, Bath BA2 7AY, UK.
Biotechnology and Bioengineering
|April 1, 1999
Summary
This study demonstrates a novel hollow-fibre ultrafiltration membrane method for refolding bovine carbonic anhydrase. This technique improves protein recovery and activity compared to traditional batch dilution methods, offering better control over refolding conditions.
Area of Science:
- Biochemistry
- Protein Chemistry
- Membrane Science
Background:
- Protein refolding is crucial for obtaining active proteins from denatured states.
- Traditional methods like batch dilution can be inefficient and sensitive to environmental factors.
- Developing controlled refolding techniques is essential for protein production and biotechnology.
Purpose of the Study:
- To develop and optimize a hollow-fibre (HF) ultrafiltration membrane system for refolding denatured bovine carbonic anhydrase.
- To compare the efficiency of HF membrane refolding with traditional batch dilution methods.
- To investigate the impact of dialysis conditions, temperature, and additives on protein refolding yield and activity.
Main Methods:
- Utilized a cellulose acetate hollow-fibre ultrafiltration membrane for controlled dialysis of guanidinium hydrochloride (GdnHCl)-denatured bovine carbonic anhydrase.
- Manipulated dialysis buffer composition and flow rate to control denaturant removal and protein refolding.
- Investigated the effect of slow, temperature-controlled dialysis (4-25°C) and additives like PEG, Tween 20, and IGEPAL CA-630.
Main Results:
- Achieved up to 42% carbonic anhydrase recovery with 94% activity under optimized dialysis conditions, outperforming batch dilution (35% yield, 85% activity).
- Slow, temperature-controlled HF refolding improved soluble protein recovery to 55% with 90% reactivation yield.
- Additives such as PEG enhanced protein recovery and activity, while detergents improved refolding yield.
Conclusions:
- Hollow-fibre ultrafiltration membrane technology offers a controlled and efficient method for refolding denatured proteins like bovine carbonic anhydrase.
- This method provides significant advantages over batch dilution, including reduced temperature sensitivity and improved protein recovery and activity.
- Further optimization with additives can enhance the performance of membrane-based protein refolding systems.