The composition, stoichiometry, and organization of protein complexes can be determined by collision-induced dissociation (CID) coupled to tandem mass spectrometry (MS/MS). The increased use of this approach in structural biology prompts a better understanding of the dissociation mechanism(s). Here we report a detailed investigation of the CID of two dodecameric, heat-stable and toroidally shaped complexes: heat shock protein 16.9 (HSP16.9) and stable protein 1 (SP-1). While HSP16.9 dissociat...Expand abstract
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Ion mobility-mass spectrometry reveals the influence of subunit packing and charge on the dissociation of multiprotein complexes.
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