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Updated: Feb 4, 2026

In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
Published on: August 13, 2012
Two-Dimensional Biochemical Purification for Global Proteomic Analysis of Macromolecular Protein Complexes
Reza Pourhaghighi1, Andrew Emili2,3,4,5
1Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada.
Abstract:
A high-resolution two-dimensional (2-D) proteomic fractionation technique for the systematic purification and subsequent mass spectrometry-based identification of endogenous protein macromolecular complexes is described. The method hyphenates preparative isoelectric focusing (IEF) with mixed-bed ion exchange chromatography (IEX) to efficiently separate cell- or tissue- derived soluble protein mixtures, allowing for more effective and less biased physiochemical characterization of stable multiprotein assemblies. After comprehensive 2D fractionation of cell-free lysates, each fraction is subjected to quantitative tandem mass spectrometry (MS/MS) and subsequent computational analysis to map high-confidence protein-protein interactions (PPIs). Herein, the experimental component (workflow protocols) for this global "interactome" network mapping platform is described.
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