Abstract
The absolute quantification (AQUA) strategy provides a means to determine the precise protein or modified protein levels directly from cells or tissues. The technique is based on two major principles: stable isotope dilution theory and the use of synthetic peptides containing such stable isotopes to exactly mimic native counterparts after proteolysis. These peptides can be synthesized with modifications such as phosphorylation, methylation, and acetylation to allow for the direct, quantitative analysis of posttranslationally modified proteins. In this chapter, we discuss the development of an AQUA method and demonstrate its usefulness in the measurement of endogenous levels of the human protein separase at a functionally relevant phosphorylation site, serine 1126.
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Gerber, S.A., Kettenbach, A.N., Rush, J., Gygi, S.P. (2007). The Absolute Quantification Strategy. 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_5
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DOI: https://doi.org/10.1007/978-1-59745-255-7_5
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