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Lipid binding to BSA conveys gas-phase stabilization. (A) 1:1 complexes between BSA and POPG exhibit remarkable resistance to collisional dissociation. (Inset) Crystal structure of human serum albumin with lysophosphatidylethanolamine (green) bound to an internal binding site. (B) Collisional activation and ion mobility MS of POPG-bound BSA reveals higher resilience of the BSA–POPG complex to gas-phase unfolding compared to the apoprotein.
