Identification of Isomeric N-glycans by Conformer Distribution Fingerprinting using Ion Mobility-Mass Spectrometry

Javier Sastre Toraño, Oier Aizpurua-Olaizola, Na Wei, Tiehai Li, Luca Unione, Gonzalo Jiménez-Osés, Francisco Corzana, Victor J Somovilla, Juan M Falcon-Perez, Geert-Jan Boons

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Glycans possess unparalleled structural complexity arising from chemically similar monosaccharide building blocks, configurations of anomeric linkages and different branching patterns, potentially giving rise to many isomers. This level of complexity is one of the main reasons that identification of exact glycan structures in biological samples still lags behind that of other biomolecules. Here, we introduce a methodology to identify isomeric N-glycans by determining gas phase conformer distributions (CDs) by measuring arrival time distributions (ATDs) using drift-tube ion mobility spectrometry-mass spectrometry . Key to the approach is the use of a range of well-defined synthetic glycans that made it possible to investigate conformer distributions in the gas phase of isomeric glycans in a systematic manner. In addition, we have computed CD fingerprints by molecular dynamics (MD) simulation, which compared well with experimentally determined CDs. It supports that ATDs resemble conformational populations in the gas phase and offer the prospect that such an approach can contribute to generating a library of CCS distributions (CCSDs) for structure identification.

Original languageEnglish
Pages (from-to)2149-2154
Number of pages6
JournalChemistry-A European Journal
Volume27
Issue number6
Early online date13 Oct 2020
DOIs
Publication statusPublished - 26 Jan 2021

Bibliographical note

Funding Information:
This project was supported by the Basque Government (postdoctoral fellowship to O.A.O.), EU Commission (Marie Skłodowska‐Curie 749996 to V.J.S.), Spanish Ministry of Science and Innovation (MCI) (FEDER funds RTI2018‐099592‐B‐C21 to F.C and RTI2018‐099592‐B‐C22 to G.J.O, the Human Frontier Science Program (postdoctoral fellowship LT000747/208‐C to L.U.) and the National Institute of Standard and Technology (NIST) (60NANB16D265 to G.J.B.).

Funding Information:
This project was supported by the Basque Government (postdoctoral fellowship to O.A.O.), EU Commission (Marie Sk?odowska-Curie 749996 to V.J.S.), Spanish Ministry of Science and Innovation (MCI) (FEDER funds RTI2018-099592-B-C21 to F.C and RTI2018-099592-B-C22 to G.J.O, the Human Frontier Science Program (postdoctoral fellowship LT000747/208-C to L.U.) and the National Institute of Standard and Technology (NIST) (60NANB16D265 to G.J.B.).

Publisher Copyright:
© 2020 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH

Keywords

  • carbohydrates
  • chemo-enzymatic synthesis
  • conformations
  • ion mobility spectrometry
  • mass spectrometry
  • molecular dynamics

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