Abstract
Since the introduction of “soft” ionization techniques, the role of mass spectrometry (MS) in the field of structural biology has increasingly expanded. With the incorporation of volatile buffers as electrospray ionization (ESI) solvents, non-covalent protein complexes could be efficiently transferred to the gas phase for mass analysis. While native MS has not become a technique used for standard characterization of therapeutic proteins in an industrial setting, it is increasingly used to probe the structural heterogeneity of these complex biomolecules. Here, we describe a detailed sample protocol for the analysis of monoclonal antibodies (mAbs) by native MS and highlight some recent applications of native MS in the analysis of intact mAbs and mAb-based therapeutics.
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