title: Chemoselective synthesis and analysis of naturally occurring phosphorylated cysteine peptides.
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 IICB(Glc), 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.
authors: Leibniz-Institut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany.
authors: Jordi
authors: J
authors: Bertran-Vicente
authors: Leibniz-Institut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany.|Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, D-12489 Berlin, Germany.
authors: Martin
authors: M
authors: Penkert
authors: Leibniz-Institut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany.|Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, D-12489 Berlin, Germany.
authors: Olaia
authors: O
authors: Nieto-Garcia
authors: Institute of Biochemistry and Molecular Medicine, University of Bern, 3012 Bern, Switzerland.
authors: Jean-Marc
authors: JM
authors: Jeckelmann
authors: Leibniz-Institut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany.
authors: Peter
authors: P
authors: Schmieder
authors: Leibniz-Institut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany.
authors: Eberhard
authors: E
authors: Krause
authors: Leibniz-Institut für Molekulare Pharmakologie (FMP), Robert-Rössle-Str. 10, D-13125 Berlin, Germany.|Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, D-12489 Berlin, Germany.
authors: Christian P R
authors: CP
authors: Hackenberger
mesh_terms: D003545:Cysteine / Q000737:chemistry*; D004926:Escherichia coli / Q000378:metabolism*; D013058:Mass Spectrometry / Q000379:methods; D010455:Peptides / Q000138:chemical synthesis* / Q000737:chemistry; D010766:Phosphorylation; D060327:Solid-Phase Synthesis Techniques / Q000379:methods*
chemical_list: D010455:Peptides; D003545:Cysteine