Abstract

In-cell fast photochemical oxidation of proteins (IC-FPOP) is a protein footprinting method that utilizes hydroxyl radicals to oxidatively modify the side chains of solvent accessible amino acids. Liquid chromatography coupled to mass spectrometry is used to both identify modified amino acids and quantify the levels of labeling. Owing to solvent accessibility changing upon binding or changes in conformations, IC-FPOP can be used to identify protein-ligand and protein-protein interaction sites and regions of conformational change.

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