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from ECD. Our results showed that α-helix region has the lowest deuteration level and the C-terminal fraction containing a highly mobile tail has the highest deuteration level, which correlates well with previous X-Ray and HDX/NMR analyses. We studied site-specific H/D exchange kinetics by monitoring H/D exchange rate of several structural motives of ubiquitin. Two hydrogen bonded β-strands showed similar HDX rates. However, the outer β-strand always has higher deuteration level than the inner β-strand. The HDX rate of the turn structure (residues 8-11) is lower than that of β-strands (residues 1-7 and residues 12-17) it connects. Although isotopic distribution gets broader after H/D exchange which results in a limited number of backbone cleavage sites detected, our results demonstrate that this method can provide valuable detailed structural information of proteins. This approach should also be suitable for the structural investigation of other unknown proteins, protein conformational changes, as well as protein-protein interactions and dynamics.

Protein Structural Characterization by Hydrogen/Deuterium Exchange Mass Spectrometry with Top-down Electron Capture Dissociation