[en] A mixed phospholipid-cholestrol bilayer, with cholera toxin B (CTB) units attached to the monosialotetrahexosylganglioside (GM1) binding sites in the distal leaflet, was deposited on a Au(111) electrode surface. Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) measurements were used to characterize structural and orientational changes in this model biological membrane upon binding CTB and the application of the electrode potential. The data presented in this article show that binding cholera toxin to the membrane leads to an overall increase in the tilt angle of the fatty acid chains; however, the conformation of the bilayer remains relatively constant as indicated by the small decrease in the total number of gauche conformers of acyl tails. In addition, the bound toxin caused a significant decrease in the hydration of the ester group contained within the lipid bilayer. Furthermore, changes in the applied potential had a minimal effect on the overall structure of the membrane. In contrast, our results showed significant voltage-dependent changes in the average orientation of the protein alpha-helices that may correspond to the voltage-gated opening and closing of the central pore that resides within the B subunit of cholera toxin.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Leitch, J. Jay
Brosseau, Christa L.
Roscoe, Sharon G.
Bessonov, Kyrylo ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Bioinformatique
Dutcher, John R.
Lipkowski, Jacek
Language :
English
Title :
Electrochemical and PM-IRRAS characterization of cholera toxin binding at a model biological membrane.
Publication date :
2013
Journal title :
Langmuir
ISSN :
0743-7463
eISSN :
1520-5827
Publisher :
American Chemical Society, Washington, United States - District of Columbia
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