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        HydrogenDeuterium Exchange Coupled to Mass Spectrometry to Investigate LigandReceptor Interactions

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        A method for exploring protein–protein interactions using hydrogen/deuterium exchange coupled to mass spectrometry is described. The method monitors the exchange of backbone (amide) hydrogens in solutions of deuterated water that primarily occur on portions of the protein exposed to solvent. In the presence of a protein binding partner, regions that experience reduced exchange are either part of the protein–protein interaction interface or undergo conformational changes to reduce accessibility to solvent. This method has the advantage of being used under physiological conditions with unmodified proteins. In this chapter, we describe an approach suitable for probing interactions among relatively large proteins using conventional mass spectrometry systems. The interaction between human transferrin and the Neisseria meningitidis receptor protein, transferrin binding protein B, provides a challenging system as an example.
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