Two-Step purification of pathogenesis-related proteins from grape juice and crystallization of thaumatin-like proteins

Steven C. Van Sluyter, Matteo Marangon, Samuel D. Stranks, Karlie A. Neilson, Yoji Hayasaka, Paul A. Haynes, R. Ian Menz, Elizabeth J. Waters

    Research output: Contribution to journalArticlepeer-review

    43 Citations (Scopus)

    Abstract

    Grape thaumatin-like (TL) proteins and chitinases play roles in plant-pathogen interactions and can cause protein haze in white wine unless removed prior to bottling. A two-step method is described that highly purified hundreds of milligrams of TL proteins and chitinases from two juices by strong cation exchange (SCX) and hydrophobic interaction chromatography (HIC). The method was fast and separated isoforms of TL proteins and chitinases from within the same juice, in most cases to >97% purity. The isolated proteins were identified by peptide nanoLC-MS/MS and crystallized using a high-throughput screening method. Crystals from three protein fractions produced highresolution X-ray crystallography data.

    Original languageEnglish
    Pages (from-to)11376-11380
    Number of pages5
    JournalJournal of Agricultural and Food Chemistry
    Volume57
    Issue number23
    DOIs
    Publication statusPublished - 9 Dec 2009

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