Volume 58, Issue 49 pp. 17616-17620
Communication

Ion-Mobility Spectrometry Can Assign Exact Fucosyl Positions in Glycans and Prevent Misinterpretation of Mass-Spectrometry Data After Gas-Phase Rearrangement

Javier Sastre Toraño

Javier Sastre Toraño

Department of Chemical Biology and Drug Discovery, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands

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Ivan A. Gagarinov

Ivan A. Gagarinov

Department of Chemical Biology and Drug Discovery, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands

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Gaël M. Vos

Gaël M. Vos

Department of Chemical Biology and Drug Discovery, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands

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Frederik Broszeit

Frederik Broszeit

Department of Chemical Biology and Drug Discovery, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands

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Apoorva D. Srivastava

Apoorva D. Srivastava

Department of Chemical Biology and Drug Discovery, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands

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Dr. Martin Palmer

Dr. Martin Palmer

Waters Corporation, Stamford Avenue, Altrincham Road, SK9 4AX Wilmslow, UK

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Dr. James I. Langridge

Dr. James I. Langridge

Waters Corporation, Stamford Avenue, Altrincham Road, SK9 4AX Wilmslow, UK

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Dr. Oier Aizpurua-Olaizola

Dr. Oier Aizpurua-Olaizola

Department of Chemical Biology and Drug Discovery, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands

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Dr. Victor J. Somovilla

Dr. Victor J. Somovilla

Department of Chemical Biology and Drug Discovery, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands

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Prof. Dr. Geert-Jan Boons

Corresponding Author

Prof. Dr. Geert-Jan Boons

Department of Chemical Biology and Drug Discovery, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht, The Netherlands

Complex Carbohydrate Research Center and Department of Chemistry, University of Georgia, 315 Riverbend Road, Athens, GA, 30602 USA

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First published: 23 September 2019
Citations: 24

Graphical Abstract

A clear case: The determination of glycan fucosyl positions with MS/MS is complicated due to rearrangements in the gas-phase, leading to erroneous structural assignments. Unique IMS arrival-time distributions of MS/MS fragments can be used to discriminate between fucosides originating from parent compounds and rearranged fucosyl residues, preventing misinterpretation of MS/MS spectra.

Abstract

The fucosylation of glycans leads to diverse structures and is associated with many biological and disease processes. The exact determination of fucoside positions by tandem mass spectrometry (MS/MS) is complicated because rearrangements in the gas phase lead to erroneous structural assignments. Here, we demonstrate that the combined use of ion-mobility MS and well-defined synthetic glycan standards can prevent misinterpretation of MS/MS spectra and incorrect structural assignments of fucosylated glycans. We show that fucosyl residues do not migrate to hydroxyl groups but to acetamido moieties of N-acetylneuraminic acid as well as N-acetylglucosamine residues and nucleophilic sites of an anomeric tag, yielding specific isomeric fragment ions. This mechanistic insight enables the characterization of unique IMS arrival-time distributions of the isomers which can be used to accurately determine fucosyl positions in glycans.

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