UNIGE document Scientific Article
previous document  unige:39670  next document
add to browser collection

Exploitation of specific properties of trifluoroethanol for extraction and separation of membrane proteins

Deshusses, Jacques M. P.
Burgess, Jennifer A
Corthals, Garry L
show hidden authors show all authors [1 - 10]
Published in Proteomics. 2003, vol. 3, no. 8, p. 1418-24
Abstract Hydrophobic proteins are difficult to analyze by two-dimensional electrophoresis (2-DE) because of their intrinsic tendency to self-aggregate during the first dimension (isoelectric focusing, IEF) or the equilibration steps. This aggregation renders their redissolution for the second dimension uncertain and results in the reduction of the number and intensity of protein spots, and in undesirable vertical and horizontal streaks across gels. Trifluoroethanol (TFE) is traditionally used at high concentration to solubilize peptides and proteins for NMR studies. Depending upon its concentration, TFE strongly affects the three-dimensional structure of proteins. We report here a phase separation system based on TFE/CHCl(3), which is able to extract a number of intrinsic membrane proteins. The addition of TFE in the in-gel sample rehydration buffer to improve membrane protein IEF separation is also presented. The procedure using urea, thiourea, and sulfobetaine as chaotropic agents was modified by the addition of TFE and removing of sulfobetaine at an optimized concentration in the solubilization medium used for the first dimension. When using membrane fractions isolated from Escherichia coli, the intensity and the number of spots detected from 2-DE gels that used TFE in the solubilization medium were significantly increased. The majority of the proteins identified using peptide mass fingerprinting and tandem mass spectrometry (MS/MS) were intrinsic membrane proteins, proteins of beta barrel structure or transmembrane proteins.
Keywords Electrophoresis, Gel, Two-DimensionalMembrane Proteins/isolation & purificationSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationTrifluoroethanol/chemistry
PMID: 12923766
Full text
Article (Published version) (128 Kb) - document accessible for UNIGE members only Limited access to UNIGE
Research group Groupe de Recherche Translationnelle en Biomarqueurs (635)
(ISO format)
DESHUSSES, Jacques M. P. et al. Exploitation of specific properties of trifluoroethanol for extraction and separation of membrane proteins. In: Proteomics, 2003, vol. 3, n° 8, p. 1418-24. doi: 10.1002/pmic.200300492 https://archive-ouverte.unige.ch/unige:39670

460 hits

1 download


Deposited on : 2014-08-25

Export document
Format :
Citation style :