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Enzyme purification by genetically attached polycysteine and polyphenylalanine affinity tails
M Persson1, M G Bergstrand, L Bülow
1Pure and Applied Biochemistry, Chemical Center, University of Lund, Sweden.
Analytical Biochemistry
|August 1, 1988
Summary
Novel affinity tails, polycysteine and polyphenylalanine, were genetically fused to enzymes for easier purification. These modified enzymes, cysteine galactokinase and phenylalanine beta-galactosidase, showed improved purification via specialized chromatography.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Engineering
Background:
- Enzyme purification is crucial for biochemical research and applications.
- Genetic modification offers a powerful tool for protein engineering and purification strategies.
Purpose of the Study:
- To develop and evaluate novel affinity tails for facilitating enzyme purification.
- To genetically engineer galactokinase and beta-galactosidase with polycysteine and polyphenylalanine tails, respectively.
Main Methods:
- Genetic fusion of DNA linkers encoding cysteine residues to the galactokinase gene.
- Homopolymer tailing to create phenylalanine-modified beta-galactosidase.
- Purification using thiopropyl-Sepharose and hydrophobic interaction chromatography (HIC).
Main Results:
- Cysteine galactokinase showed specific binding and elution from thiopropyl-Sepharose using dithiothreitol (DTT).
- Native galactokinase did not bind to the thiopropyl-Sepharose column.
- Phenylalanine-modified beta-galactosidase was purified to homogeneity using FPLC with phenyl-Superose HIC.
Conclusions:
- Polycysteine and polyphenylalanine affinity tails are effective for genetically facilitating enzyme purification.
- These novel affinity tags enable efficient and specific purification of target enzymes using established chromatographic techniques.