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Engineering proteins to enhance their partition coefficients in aqueous two-phase systems
K Köhler1, C Ljungquist, A Kondo
1Department of Biochemistry and Biotechnology, Royal Institute of Technology, Stockholm, Sweden.
Bio/Technology (Nature Publishing Company)
|July 1, 1991
Summary
Researchers developed a novel peptide fusion method to improve recombinant protein separation in aqueous two-phase systems. This technique enhances protein partitioning, simplifying purification processes for biotechnological applications.
Area of Science:
- Biotechnology
- Protein Engineering
- Bioseparation
Background:
- Recombinant protein purification is crucial for biotechnology.
- Existing methods for partitioning proteins in aqueous two-phase systems have limitations.
- Poly(ethylene glycol)/potassium phosphate systems are widely used but require optimization for specific proteins.
Purpose of the Study:
- To develop a novel method for partitioning recombinant proteins into the polymer-rich phase of aqueous two-phase systems.
- To engineer a model protein's partitioning behavior using peptide fusions.
- To demonstrate the effectiveness of a designed partitioning peptide.
Main Methods:
- Fusion of gene fragments encoding a partitioning peptide to a model protein gene (ZZ).
- Intracellular production of fusion proteins in Escherichia coli.
- Determination of partition coefficients in poly(ethylene glycol) 4000/potassium phosphate systems.
- Molecular modeling to design the partitioning peptide (AlaTrpTrpPro).
Main Results:
- Fusion proteins exhibited significantly altered partitioning behavior compared to the native ZZ protein.
- The partition coefficient of the ZZ protein was dramatically enhanced by fusing one or three partitioning peptides.
- Partition coefficients increased from 1.6 to 11.6 (one peptide) and to 96 (three peptides) in optimized systems.
Conclusions:
- Peptide fusion is an effective strategy to control and enhance recombinant protein partitioning in aqueous two-phase systems.
- The designed partitioning peptide significantly improves the separation of proteins into the polymer-rich phase.
- This method offers a novel approach for efficient recombinant protein purification.