Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Ion Spectroscopy Reveals Structural Difference for Proteins Microhydrated by Retention and Condensation of Water
 
research article

Ion Spectroscopy Reveals Structural Difference for Proteins Microhydrated by Retention and Condensation of Water

Zviagin, Andrei  
•
Boyarkin, Oleg V.  
March 15, 2024
The Journal of Physical Chemistry A

Protein ubiquitin in its +7 charge state microhydrated by 5 and 10 water molecules has been interrogated in the gas phase by cold ion UV/IR spectroscopy. The complexes were formed either by condensing water onto the unfolded bare proteins in a temperature-controlled ion trap or by incomplete dehydration of the folded proteins. In the case of cryogenic condensation, the UV spectra of the complexes exhibit a resolved vibrational structure, which looks similar to the spectrum of bare unfolded ubiquitin. The spectra become, however, broad-band with no structure when complexes of the same size are produced by incomplete dehydration under soft conditions of electrospray ionization. We attribute this spectroscopic dissimilarity to the structural difference of the protein: condensing a few water molecules cannot refold the gas-phase structure of the bare ubiquitin, while the retained water preserves its solution-like folded motif through evaporative cooling. This assessment is firmly confirmed by IR spectroscopy, which reveals the presence of free NH and carboxylic OH stretching vibrations only in the complexes with condensed water.

  • Files
  • Details
  • Metrics
Type
research article
DOI
10.1021/acs.jpca.4c00263
Web of Science ID

WOS:001186335600001

Author(s)
Zviagin, Andrei  
Boyarkin, Oleg V.  
Date Issued

2024-03-15

Publisher

Amer Chemical Soc

Published in
The Journal of Physical Chemistry A
Volume

128

Issue

12

Start page

2317

End page

2322

Subjects

Physical Sciences

•

Gas-Phase

•

Native Ubiquitin

•

State

•

Conformations

•

Transitions

•

Stability

•

Exchange

•

Peptide

•

Trap

•

Ms

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SCI-SB-RB  
FunderFunding(s)Grant NumberGrant URL

Swiss National Science Foundation

200020_204072

RelationRelated workURL/DOI

IsSupplementedBy

FNS 200020_204072: Cold ion spectroscopy – mass spectroscopy for structural determinations and identifications odf biomolecules

https://infoscience.epfl.ch/handle/20.500.14299/255192
Available on Infoscience
April 3, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/206955
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés