Abstract
We describe a new method for quantitative tissue proteomics using culture-derived isotope tags (CDIT), which are cells grown in stable isotope-enriched medium and added to each tissue sample to provide internal standards. After protein identification by mass spectrometry (MS), each peak derived from tissue protein is quantified relative to the corresponding CDIT peak. The amounts of each peak in different tissue samples can be compared relative to CDIT. Even if the corresponding peak from CDIT can not be detected, a peak with a similar scan number, but different sequence on liquid chromatography (LC)-MS, can be used to obtain semiquantitative values. Absolute quantification is possible by determining the protein amount in CDIT in advance using unlabeled synthetic peptides; this is less costly than other methods, such as AQUA.
For identification of specific components in a protein complex, target proteins are enriched or isolated by affinity techniques using bait-conjugated matrix, but many non-specific binders are often found. Stable isotope labeling strategies have proven particularly advantageous for the discrimination of proteins specifically associated with the target population from nonspecifically, copurified contaminants. We also describe a protocol for efficient in-gel digestion and high-performance nano-LC column preparation, which makes it possible to quantify larger numbers of proteins.
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Sato, T., Ishihama, Y., Oda, Y. (2007). Quantitative Proteomics of Mouse Brain and Specific Protein-Interaction Studies Using Stable Isotope Labeling. In: Sechi, S. (eds) Quantitative Proteomics by Mass Spectrometry. Methods in Molecular Biology, vol 359. Humana Press. https://doi.org/10.1007/978-1-59745-255-7_4
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DOI: https://doi.org/10.1007/978-1-59745-255-7_4
Publisher Name: Humana Press
Print ISBN: 978-1-58829-571-2
Online ISBN: 978-1-59745-255-7
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