Journal
ANALYTICAL CHEMISTRY
Volume 93, Issue 5, Pages 2933-2941Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c04556
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Funding
- National Science Foundation Division of Chemistry [CHE-1654274]
- Division of Molecular and Cellular Biosciences
- National Institutes of General Medicine [R01GM134247, R01GM054226]
- National Institute of Allergy and Infectious Disease [1R21AI125973]
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The study introduces a new generation trapped ion mobility spectrometer (TIMS) that is capable of trapping high-molecular-weight macromolecular assemblies with high mobility resolution and measurement of ion-neutral collision cross-section.
The structural elucidation of native macromolecular assemblies has been a subject of considerable interest in native mass spectrometry (MS), and more recently in tandem with ion mobility spectrometry (IMS-MS), for a better understanding of their biochemical and biophysical functions. In the present work, we describe a new generation trapped ion mobility spectrometer (TIMS), with extended mobility range (K-0 = 0.185-1.84 cm(2).V-1.s(-1)), capable of trapping high-molecular-weight (MW) macromolecular assemblies. This compact 4 cm long TIMS analyzer utilizes a convex electrode, quadrupolar geometry with increased pseudopotential penetration in the radial dimension, extending the mobility trapping to high-MW species under native state (i.e., lower charge states). The TIMS capabilities to perform variable scan rate (Sr) mobility measurements over short time (100-500 ms), high-mobility resolution, and ion-neutral collision cross-section (CCSN2) measurements are presented. The trapping capabilities of the convex electrode TIMS geometry and ease of operation over a wide gas flow, rf range, and electric field trapping range are illustrated for the first time using a comprehensive list of standards varying from CsI clusters (n = 6-73), Tuning Mix oligomers (n = 1-5), common proteins (e.g., ubiquitin, cytochrome C, lysozyme, concanavalin (n = 1-4), carbonic anhydrase, beta clamp (n = 1-4), topoisomerase IB, bovine serum albumin (n = 1-3), topoisomerase IA, alcohol dehydrogenase), IgG antibody (e.g., avastin), protein-DNA complexes, and macromolecular assemblies (e.g., GroEL and RNA polymerase (n = 1-2)) covering a wide mass (up to m/z 19 000) and CCS range (up to 22 000 angstrom(2) with <0.6% relative standard deviation (RSD)).
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