Cytochrome c is Highly Compact upon Transfer into the Gas Phase from Strong Acids as Revealed by High-Pressure ESI Ion Mobility-Mass Spectrometry
A substantial increase in the acidity of the protein solution (e.g., from pH 2 to pH 1) is known to induce the compaction of fully unfolded proteins, such as cytochrome c, into a non-native yet highly compact molten globule state, referred to as the A-state. In this study, the conformational landscape of the gaseous...