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Equilibrium-fluctuation-analysis of single liposome binding events reveals how cholesterol and Ca2+ modulate glycosphingolipid trans-interactions

Angelika Kunze ; Marta Bally (Institutionen för teknisk fysik, Biologisk fysik) ; Fredrik Höök (Institutionen för teknisk fysik, Biologisk fysik) ; Göran Larson
Scientific Reports (2045-2322). Vol. 3 (2013),
[Artikel, refereegranskad vetenskaplig]

Carbohydrate-carbohydrate interactions (CCIs) are of central importance for several biological processes. However, the ultra-weak nature of CCIs generates difficulties in studying this interaction, thus only little is known about CCIs. Here we present a highly sensitive equilibrium-fluctuation-analysis of single liposome binding events to supported lipid bilayers (SLBs) based on total internal reflection fluorescence (TIRF) microscopy that allows us to determine apparent kinetic rate constants of CCIs. The liposomes and SLBs both contained natural Le(x) glycosphingolipids (Gal beta 4( Fuc alpha 3) GlcNAc beta 3Gal beta 4Glc beta 1Cer), which were employed to mimic cell-cell contacts. The kinetic parameters of the self-interaction between Le(x)-containing liposomes and SLBs were measured and found to be modulated by bivalent cations. Even more interestingly, upon addition of cholesterol, the strength of the CCIs increases, suggesting that this interaction is strongly influenced by a cholesterol-dependent presentation and/or spatial organization of glycosphingolipids in cell membranes.

Nyckelord: supported lipid-bilayers, carbohydrate-carbohydrate interactions, cell-adhesion, mismatch discrimination, unilamellar vesicles, model, system, qcm-d, recognition, membranes, antigens

Denna post skapades 2013-04-05. Senast ändrad 2013-04-05.
CPL Pubid: 175369


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Institutioner (Chalmers)

Institutionen för biomedicin, avdelningen för klinisk kemi och transfusionsmedicin (GU)
Institutionen för teknisk fysik, Biologisk fysik (2007-2015)



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