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Integrated strategy for selective expanded bed ion-exchange adsorption and site-specific protein processing using
Torbjörn Gräslund1, My Hedhammar, Mathias Uhlén
1Department of Biotechnology, Royal Institute of Technology (KTH), SCFAB, S-106 91, Stockholm, Sweden.
Journal of Biotechnology
|July 27, 2002
Summary
This study introduces Z(basic) fusion proteins for efficient protein purification using cation exchange chromatography. This method allows single-step purification of target proteins from crude lysates with high selectivity.
Area of Science:
- Biochemistry
- Protein Purification
- Chromatography
Background:
- The Z(basic) domain enhances protein adsorption to cation exchange resins at high pH.
- Current purification methods often require specific pH conditions or multiple steps.
Purpose of the Study:
- To develop a single-step purification strategy for target proteins fused to Z(basic) at physiological pH.
- To demonstrate the efficiency and selectivity of this method using cation exchange chromatography in expanded bed mode.
Main Methods:
- Utilizing Z(basic) as a fusion partner for target proteins.
- Employing cation exchange chromatography in an expanded bed mode at constant physiological pH.
- Implementing site-specific cleavage for removal of the Z(basic) tag.
Main Results:
- Efficient purification of Klenow DNA polymerase and viral protease 3C from unclarified Escherichia coli homogenates.
- Achieved selectivity comparable to affinity chromatography in a single step.
- Successfully demonstrated site-specific removal of the Z(basic) handle to obtain purified target proteins.
Conclusions:
- The Z(basic) fusion strategy offers a robust and efficient method for protein purification.
- This approach simplifies purification processes by operating at physiological pH and reducing the number of steps.
- The integrated tag removal system yields high-purity target proteins suitable for further applications.