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Designing a high throughput refolding array using a combination of the GroEL chaperonin and osmolytes
Paul A Voziyan1, Mary Johnston, Angela Chao
1Department of Medicine/Nephrology, Vanderbilt University Medical Center, Nashville, TN 37232-2372, USA.
Journal of Structural and Functional Genomics
|October 8, 2005
Summary
Combining chaperonins (GroEL) and osmolytes offers a powerful new method for protein folding, simplifying the process and enabling refolding of difficult proteins. This technique avoids aggregation and yields high-quality proteins for structural studies.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Science
Background:
- Chaperonins (GroEL) and osmolytes are known protein folding aids.
- Individual use of these agents has limitations for refolding difficult proteins.
Purpose of the Study:
- To investigate the combined effect of chaperonins and osmolytes for protein folding.
- To develop a simplified and effective method for refolding challenging proteins.
Main Methods:
- Forming a stable chaperonin-substrate complex without nucleotide.
- Adding osmolytes and nucleotides to create a 'folding array' for condition screening.
- Utilizing soluble or immobilized GroEL for protein refolding.
Main Results:
- The combination eliminates the need for co-chaperonin GroES.
- Proteins can be refolded at high concentrations (mg/ml), preventing aggregation.
- Successful refolding of proteins from inclusion bodies and rescue of misfolded mutant proteins.
Conclusions:
- The chaperonin/osmolyte system is a versatile and efficient method for protein refolding.
- This technique simplifies the chaperonin reaction and enhances folding yields.
- Enables isolation of folded proteins suitable for structural analysis (X-ray crystallography, NMR).