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  Charge-induced geometrical reorganization of DNA oligonucleotides studied by tandem mass spectrometry and ion mobility

Ickert, S., Hofmann, J., Riedel, J., Beck, S., Pagel, K., & Linscheid, M. W. (2018). Charge-induced geometrical reorganization of DNA oligonucleotides studied by tandem mass spectrometry and ion mobility. European Journal of Mass Spectrometry, 24(2), 225-230. doi:10.1177/1469066717746896.

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 Creators:
Ickert, Stefanie1, 2, Author
Hofmann, Johanna3, 4, Author           
Riedel, Jens2, Author
Beck, Sebastian1, Author
Pagel, Kevin3, 4, Author           
Linscheid, Michael W1, Author
Affiliations:
1Department of Chemistry, Humboldt-Universitaet zu Berlin, Berlin, Germany, ou_persistent22              
2Federal Institute for Materials Research and Testing, Berlin, Germany, ou_persistent22              
3Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
4Institute of Chemistry and Biochemistry, Free University, Berlin, Germany, ou_persistent22              

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Free keywords: Collision-induced dissociation, mass spectrometry, oligonucleotide, fragmentation, ion mobility, tandem-MS
 Abstract: Mass spectrometry is applied as a tool for the elucidation of molecular structures. This premises that gas-phase structures reflect the original geometry of the analytes, while it requires a thorough understanding and investigation of the forces controlling and affecting the gas-phase structures. However, only little is known about conformational changes of oligonucleotides in the gas phase. In this study, a series of multiply charged DNA oligonucleotides (n = 15–40) has been subjected to a comprehensive tandem mass spectrometric study to unravel transitions between different ionic gas-phase structures. The nucleobase sequence and the chain length were varied to gain insights into their influence on the geometrical oligonucleotide organization. Altogether, 23 oligonucleotides were analyzed using collision-induced fragmentation. All sequences showed comparable correlation regarding the characteristic collision energy. This value that is also a measure for stability, strongly correlates with the net charge density of the precursor ions. With decreasing charge of the oligonucleotides, an increase in the fragmentation energy was observed. At a distinct charge density, a deviation from linearity was observed for all studied species, indicating a structural reorganization. To corroborate the proposed geometrical change, collisional cross-sections of the oligonucleotides at different charge states were determined using ion mobility-mass spectrometry. The results clearly indicate that an increase in charge density and thus Coulomb repulsion results in the transition from a folded, compact form to elongated structures of the precursor ions. Our data show this structural transition to depend mainly on the charge density, whereas sequence and size do not have an influence.

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Language(s): eng - English
 Dates: 2017-11-082017-11-172017-12-112018-04-01
 Publication Status: Issued
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1177/1469066717746896
 Degree: -

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Title: European Journal of Mass Spectrometry
  Other : Eur. J. Mass Spectrom.
Source Genre: Journal
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Publ. Info: Chichester : SAGE
Pages: - Volume / Issue: 24 (2) Sequence Number: - Start / End Page: 225 - 230 Identifier: ISSN: 1469-0667
CoNE: https://pure.mpg.de/cone/journals/resource/954925618118