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. Author manuscript; available in PMC: 2022 Jul 7.
Published in final edited form as: J Am Soc Mass Spectrom. 2021 Jun 21;32(7):1553–1561. doi: 10.1021/jasms.1c00100

Figure 2.

Figure 2.

(a) Collision cross section (CCS) distributions for PPIPrOH → PPIIaq transition for Pro7. Bottom CCS distributions obtained by integrating the ions with different m/z values show the formation of the PPI helix in propanol and the formation of the PPII helix in water. Kinetic studies from 2 to 246 min at 296 K in 40:59.5:0.5 1-propanol/H2O/HOAc (v/v/v) show the transition from PPI to PPII. Structures derived from molecular dynamic simulations are shown for each CCS peak. (b) Relative abundance of different charge states and conformers as a function of transition time. See text and ref 27 for details. Adapted ref 27. Copyright 2015 American Chemical Society.