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Optimized expression and refolding of human keratoepithelin in BL21 (DE3)
Ching Yuan1, Janice M Reuland, Lyndon Lee
1Department of Ophthalmology, University of Minnesota, Minneapolis, MN, USA. huang088@umn.edu
Protein Expression and Purification
|March 25, 2004
Summary
Researchers developed a method to produce large quantities of recombinant Keratoepithelin (KE) protein in E. coli. This breakthrough facilitates further study into corneal dystrophies caused by KE gene mutations.
Area of Science:
- Biochemistry
- Molecular Biology
- Ophthalmology
Background:
- Keratoepithelin (KE) is crucial for cell adhesion and differentiation.
- Mutations in the KE gene lead to corneal dystrophies due to abnormal protein deposits.
- Previous studies were hindered by difficulties in purifying KE protein.
Purpose of the Study:
- To develop a method for high-yield production of recombinant human KE protein.
- To enable further research into KE protein's function and related corneal diseases.
Main Methods:
- Constructed a high-expression plasmid with the human KE gene.
- Expressed recombinant KE protein in Escherichia coli (E. coli) BL21 (DE3).
- Purified the His-tagged fusion protein using nickel chelation affinity chromatography under denaturing conditions.
- Refolded the purified KE protein using arginine-containing dialysis solutions.
Main Results:
- Successfully produced recombinant KE protein in E. coli.
- Obtained an average of 12 mg of purified KE per liter of culture.
- Achieved approximately 70% recovery of bioactive KE after refolding.
Conclusions:
- Established a reproducible method for large-scale production of recombinant KE and mutant proteins.
- The developed procedure will facilitate future biochemical and biophysical studies of KE.
- This work aids in understanding the pathogenesis of KE-related corneal dystrophies.