Chemoselective synthesis and analysis of naturally occurring phosphorylated cysteine peptides

Jordi Bertran-Vicente, Martin Penkert, Olaia Nieto-Garcia, Jean-Marc Jeckelmann, Peter Schmieder, Eberhard Krause and Christian P. R. Hackenberger ()
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Jordi Bertran-Vicente: Leibniz-Institut für Molekulare Pharmakologie (FMP)
Martin Penkert: Leibniz-Institut für Molekulare Pharmakologie (FMP)
Olaia Nieto-Garcia: Leibniz-Institut für Molekulare Pharmakologie (FMP)
Jean-Marc Jeckelmann: Institute of Biochemistry and Molecular Medicine, University of Bern
Peter Schmieder: Leibniz-Institut für Molekulare Pharmakologie (FMP)
Eberhard Krause: Leibniz-Institut für Molekulare Pharmakologie (FMP)
Christian P. R. Hackenberger: Leibniz-Institut für Molekulare Pharmakologie (FMP)

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract In contrast to protein O-phosphorylation, studying the function of the less frequent N- and S-phosphorylation events have lagged behind because they have chemical features that prevent their manipulation through standard synthetic and analytical methods. Here we report on the development of a chemoselective synthetic method to phosphorylate Cys side-chains in unprotected peptides. This approach makes use of a reaction between nucleophilic phosphites and electrophilic disulfides accessible by standard methods. We achieve the stereochemically defined phosphorylation of a Cys residue and verify the modification using electron-transfer higher-energy dissociation (EThcD) mass spectrometry. To demonstrate the use of the approach in resolving biological questions, we identify an endogenous Cys phosphorylation site in IICBGlc, which is known to be involved in the carbohydrate uptake from the bacterial phosphotransferase system (PTS). This new chemical and analytical approach finally allows further investigating the functions and significance of Cys phosphorylation in a wide range of crucial cellular processes.

Date: 2016
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DOI: 10.1038/ncomms12703

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