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Ion mobility analysis of molecular dynamics.

Thomas Wyttenbach1, Nicholas A Pierson, David E Clemmer

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This study uses mass spectrometry and ion mobility spectrometry (IMS) to investigate the molecular dynamics of ions without solvents. Researchers explored structural changes in various molecules, revealing insights into conformational dynamics.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Biophysical Chemistry

Background:

  • Investigating molecular dynamics of polyatomic ions in the gas phase is crucial for understanding fundamental chemical and biological processes.
  • Traditional methods often struggle to provide insights into ion structures and dynamics on biologically relevant timescales.
  • The absence of solvent interactions offers a unique perspective on intrinsic molecular behavior.

Purpose of the Study:

  • To explore the capabilities of mass spectrometry coupled with ion mobility spectrometry (IMS-IMS) for studying gas-phase ion dynamics.
  • To investigate structural changes and conformational interconversions of diverse ions (dinucleotide, polyethylene glycol, bradykinin, ubiquitin, peptide oligomers).
  • To demonstrate the utility of temperature-variable drift cells and segmented drift tubes for time-resolved ion analysis.

Main Methods:

  • Utilized a combination of mass spectrometry and ion mobility spectrometry (IMS-IMS) with specialized drift cells.
  • Employed temperature-variable drift cells and segmented drift tubes to enable IMS-IMS experiments.
  • Analyzed five distinct systems: a dinucleotide, sodiated polyethylene glycol, bradykinin, ubiquitin, and peptide oligomers.

Main Results:

  • Obtained information on molecular dynamics of polyatomic ions in solvent-free conditions.
  • Investigated structural changes in both activated and native ion populations over 1-100 ms timescales.
  • Determined barriers to conformational interconversion in specific cases and observed solution-like native structures.

Conclusions:

  • Mass spectrometry and ion mobility spectrometry (IMS-IMS) are powerful tools for gas-phase molecular dynamics studies.
  • The experimental approach allows for the characterization of intrinsic ion structures and dynamics.
  • Theoretical modeling complements experimental data, enhancing the understanding of ion behavior.