Journal
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Volume 27, Issue 6, Pages 1079-1088Publisher
AMER CHEMICAL SOC
DOI: 10.1007/s13361-016-1363-7
Keywords
Electron capture dissociation; Gas phase; Native mass spectrometry; Protein; Protein folding
Funding
- Austrian Science Fund (FWF) [Y372, P27347]
- Austrian Science Fund (FWF) [P27347] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [Y 372, P 27347] Funding Source: researchfish
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Electron capture dissociation was used to probe the structure, unfolding, and folding of KIX ions in the gas phase. At energies for vibrational activation that were sufficiently high to cause loss of small molecules such as NH3 and H2O by breaking of covalent bonds in about 5% of the KIX (M + nH)(n+) ions with n = 7-9, only partial unfolding was observed, consistent with our previous hypothesis that salt bridges play an important role in stabilizing the native solution fold after transfer into the gas phase. Folding of the partially unfolded ions on a timescale of up to 10 s was observed only for (M + nH)(n+) ions with n = 9, but not n = 7 and n = 8, which we attribute to differences in the distribution of charges within the (M + nH)(n+) ions.
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