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Molecular Dynamics Simulations of Membrane-Sugar Interactions
KTH, Skolan för kemivetenskap (CHE), Fiber- och polymerteknik. KTH, Skolan för kemivetenskap (CHE), Centra, Wallenberg Wood Science Center.ORCID-id: 0000-0001-6732-2571
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2013 (Engelska)Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 117, nr 22, s. 6667-6673Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

It is well documented that disaccharides in general and trehalose (TRH) in particular strongly affect physical properties and functionality of lipid bilayers. We investigate interactions between lipid membranes formed by 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and TRH by means of molecular dynamics (MD) computer simulations. Ten different TRH concentrations were studied in the range W-TRH = 0-0.20 (w/w). The potential of mean force (PMF) for DMPC bilayer TRH interactions was determined using two different force fields, and was subsequently used in a simple analytical model for description of sugar binding at the membrane interface. The MD results were in good agreement with the predictions of the model. The net affinities of TRH for the DMPC bilayer derived from the model and MD simulations were compared with experimental results. The area per lipid increases and the membrane becomes thinner with increased TRH concentration, which is interpreted as an intercalation effect of the TRH molecules into the polar part of the lipids, resulting in conformational changes in the chains. These results are consistent with recent experimental observations. The compressibility modulus related to the fluctuations of the membrane increases dramatically with increased TRH concentration, which indicates higher order and rigidity of the bilayer. This is also reflected in a decrease (by a factor of 15) of the lateral diffusion of the lipids. We interpret these observations as a formation of a glassy state at the interface of the membrane, which has been suggested in the literature as a hypothesis for the membrane sugar interactions.

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American Chemical Society (ACS), 2013. Vol. 117, nr 22, s. 6667-6673
Nyckelord [en]
Compressibility modulus, Conformational change, Experimental observation, Intercalation effect, Lateral diffusion, Membrane interface, Molecular dynamics simulations, Potential of mean force
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Kemi
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URN: urn:nbn:se:kth:diva-124978DOI: 10.1021/jp402385dISI: 000320215200009Scopus ID: 2-s2.0-84879188507OAI: oai:DiVA.org:kth-124978DiVA, id: diva2:638961
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QC 20130805

Tillgänglig från: 2013-08-05 Skapad: 2013-08-02 Senast uppdaterad: 2017-12-06Bibliografiskt granskad

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Wohlert, Jakob

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Fiber- och polymerteknikWallenberg Wood Science Center
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Journal of Physical Chemistry B
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