Abstract
Reversible phosphorylation of proteins represents an important component of cellular signaling pathways. The isolation of phosphoproteins in complex mixtures and the determination of the level of phosphorylation have been and remain a major challenge. It has prompted the development of several strategies, including immobilized metal affinity capture to enrich for phosphorylated peptides. An improved methodology was published (Ficarro, et al., Nature Biotechnology 2002, 20, 301–305) that showed increased selectivity through esterification of amino acid side chain carboxylic groups of enzymatically digested peptides. This method was applied for relative quantitation of phosphopeptides in conjunction with the use of stable isotope labeling. The merits and limits of the approach are discussed and its application to the analysis of the effects of serum starvation on in vitro cultured human lung cells is presented.
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Published online January 15, 2004
This article is in honor of Ruedi Aebesold, recipient of the 2002 Biemann Award.
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He, T., Alving, K., Feild, B. et al. Quantitation of phosphopeptides using affinity chromatography and stable isotope labeling. J Am Soc Mass Spectrom 15, 363–373 (2004). https://doi.org/10.1016/j.jasms.2003.11.004
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DOI: https://doi.org/10.1016/j.jasms.2003.11.004