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Analysis of insoluble proteins
1Department of Chemistry, Wayne State University, Department of Chemistry, Detroit, Michigan, USA.
Biotechniques
|June 2, 2009
Summary
Analyzing insoluble proteins, like membrane proteins, is challenging in proteomics. This review covers fusion tag purification and mass spectrometry methods for high-throughput analysis of these difficult-to-study proteins.
Area of Science:
- Proteomics
- Biochemistry
- Molecular Biology
Background:
- Insoluble proteins, particularly membrane proteins, pose significant challenges in proteomic analysis due to their poor solubility in common solvents.
- These proteins constitute a substantial portion (20-30%) of the human proteome, highlighting the need for effective analytical methods.
- Current individual protein analysis is often laborious and time-consuming, limiting high-throughput studies.
Purpose of the Study:
- To provide an overview of advanced methods for the purification of expressed proteins using fusion tags.
- To present strategies for the mass spectrometry-based analysis of insoluble proteins.
- To facilitate high-throughput analysis of challenging protein samples.
Main Methods:
- Protein purification utilizing various fusion tag systems.
- Sample preparation techniques for insoluble protein fractions.
- Mass spectrometry (MS)-based proteomics for the analysis of purified and insoluble proteins.
Main Results:
- Fusion tags enable efficient purification of recombinant proteins, including those that are otherwise insoluble.
- Established mass spectrometry workflows can be adapted for the sensitive detection and quantification of proteins from insoluble fractions.
- The integration of purification and MS analysis offers a pathway to high-throughput characterization of insoluble proteomes.
Conclusions:
- Fusion tag-mediated purification is a viable strategy for handling insoluble proteins in proteomics.
- Mass spectrometry-based approaches are crucial for the comprehensive analysis of insoluble protein samples.
- These combined methods pave the way for overcoming major hurdles in the high-throughput analysis of the insoluble proteome.
