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ICPL labeling strategies for proteome research.
Friedrich Lottspeich1, Josef Kellermann
1Max Planck Institute of Biochemistry, Protein Analysis, D-82152, Martinsried, Germany. lottspei@biochem.mpg.de
Methods in Molecular Biology (Clifton, N.J.)
|May 24, 2011
Summary
Stable isotope labeling using Isotope-Coded Protein Label (ICPL) enables high-throughput proteome profiling. This mass spectrometry technique accurately quantifies thousands of proteins across multiple samples for comprehensive analysis.
Area of Science:
- Biochemistry
- Proteomics
- Analytical Chemistry
Background:
- Mass spectrometry and stable isotope labeling are crucial for protein quantification.
- High-throughput proteome profiling requires robust quantitative methods.
Purpose of the Study:
- To present Isotope-Coded Protein Label (ICPL) as a method for global proteome profiling.
- To highlight the application of ICPL for quantitative analysis of complex protein mixtures.
Main Methods:
- ICPL utilizes stable isotope tagging of free amino groups on intact proteins.
- Labeled samples (up to four proteome states) are combined, separated, and enzymatically digested.
- Peptide ratios are determined by mass spectrometry (MS), with identification via tandem MS.
- ICPLQuant software facilitates quantification of multiplexed experiments.
Main Results:
- ICPL enables accurate and reproducible quantification of thousands of proteins.
- The method provides high sequence coverage for protein identification.
- ICPL is effective for detecting posttranslational modifications and protein isoforms.
Conclusions:
- ICPL is a powerful tool for large-scale quantitative proteome profiling.
- The technique is versatile, applicable to various biological samples.
- ICPL facilitates comprehensive proteomic analyses, including PTMs and isoforms.
