Motif decomposition of the phosphotyrosine proteome reveals a new N-terminal binding motif for SHIP2

Martin Lee Miller, S. Hanke, A. M. Hinsby, Carsten Friis, Søren Brunak, M. Mann, Nikolaj Blom

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Advances in mass spectrometry-based proteomics have yielded a substantial mapping of the tyrosine phosphoproteome and thus provided an important step toward a systematic analysis of intracellular signaling networks in higher eukaryotes. In this study we decomposed an uncharacterized proteomics data set of 481 unique phosphotyrosine (Tyr(P)) peptides by sequence similarity to known ligands of the Src homology 2 (SH2) and the phosphotyrosine binding (PTB) domains. From 20 clusters we extracted 16 known and four new interaction motifs. Using quantitative mass spectrometry we pulled down Tyr(P)-specific binding partners for peptides corresponding to the extracted motifs. We confirmed numerous previously known interaction motifs and found 15 new interactions mediated by phosphosites not previously known to bind SH2 or PTB. Remarkably, a novel hydrophobic N-terminal motif ((L/V/I)(L/V/I)pY) was identified and validated as a binding motif for the SH2 domain-containing inositol phosphatase SHIP2. Our decomposition of the in vivo Tyr(P) proteome furthermore suggests that two-thirds of the Tyr(P) sites mediate interaction, whereas the remaining third govern processes such as enzyme activation and nucleic acid binding.
    Original languageEnglish
    JournalMolecular and Cellular Proteomics
    Issue number1
    Pages (from-to)181-92
    ISSN1535-9476
    Publication statusPublished - 2008

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