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High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
Procedures for the analysis and purification of his-tagged proteins
R E Kneusel1, J Crowe, M Wulbeck
1, Qiagen, Hilden, Germany.
Methods in Molecular Medicine
|March 11, 2011
Summary
Heterologous protein expression systems aid gene study by fusing proteins with affinity tags for purification. However, these tags can alter protein function and prevent purification of insoluble proteins.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Engineering
Background:
- Heterologous expression of recombinant proteins is crucial for studying gene expression.
- Existing systems often fuse proteins of interest with affinity tags like glutathione S-transferase, maltose binding protein, or protein A.
- These tags leverage natural substrate affinities for purification via chromatography.
Purpose of the Study:
- To highlight the utility of recombinant protein expression systems.
- To identify the limitations of current affinity-based purification methods.
- To underscore the challenges in purifying insoluble proteins using these systems.
Main Methods:
- Review and analysis of existing heterologous protein expression and purification systems.
- Examination of common affinity tags and their mechanisms.
- Identification of drawbacks associated with current methodologies.
Main Results:
- Affinity tags can potentially alter the native structure and function of the target protein.
- Current systems face significant limitations in purifying proteins that are insoluble.
- The reliance on natural affinities restricts the scope of applicable proteins.
Conclusions:
- While valuable, current recombinant protein expression systems have inherent limitations.
- The impact of affinity tags on protein integrity requires careful consideration.
- Development of novel strategies is needed to overcome challenges in purifying insoluble recombinant proteins.
