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Published on: January 8, 2014
An improved method for large-scale purification of recombinant human glucagon
Journal of Protein Chemistry
|October 1, 1995
Summary
Researchers improved large-scale purification of glucagon (a hormone) expressed in E. coli. The new method uses alkaline pH for solubilization and isoelectric precipitation, yielding highly pure glucagon efficiently.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Chemistry
Background:
- High-level expression of proteins like glucagon in Escherichia coli often leads to insoluble inclusion bodies.
- Previous methods using guanidinium chloride for solubilization resulted in low proteolytic activity and complex purification.
- A need exists for improved, large-scale purification methods for recombinant glucagon.
Purpose of the Study:
- To develop an improved method for large-scale purification of glucagon expressed as a fusion protein in E. coli.
- To overcome the limitations of previous solubilization and purification techniques.
Main Methods:
- Solubilization of inclusion bodies at alkaline pH.
- Cleavage of the fusion protein using amino acid-specific endopeptidases.
- Purification of glucagon using isoelectric precipitation and analytical RP-HPLC.
Main Results:
- Inclusion bodies were solubilized to high concentrations at alkaline pH.
- A new economical purification method using isoelectric precipitation was established.
- The purified glucagon achieved over 99.5% purity by analytical RP-HPLC.
- The yield was comparable to previous methods.
Conclusions:
- The improved method enables efficient large-scale purification of recombinant glucagon.
- The produced glucagon is chemically and biochemically equivalent to natural glucagon.
- This method offers a more practical approach for producing high-purity glucagon.
