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Title: Molecular Insights into the Membrane Affinities of Model Hydrophobes
Authors: Li, J.
Beuerman, R.W. 
Verma, C.S. 
Issue Date: 2018
Publisher: American Chemical Society
Citation: Li, J., Beuerman, R.W., Verma, C.S. (2018). Molecular Insights into the Membrane Affinities of Model Hydrophobes. ACS Omega 3 (3) : 2498-2507. ScholarBank@NUS Repository.
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
Abstract: Membrane-active antibiotics are of great interest in fighting bacterial resistance. ?-Mangostin is a membrane-active molecule, but there are no details of its mechanism of action at the atomistic level. We have employed free-energy simulations and microsecond-long conventional molecular dynamics simulations to study the mode of interaction of ?-mangostin with a model bacterial membrane and compare it with the mechanisms of three hydrophobic molecules (ciprofloxacin, xanthone, and tetracycline). We find that ?-mangostin is thermodynamically more favored to insert into the membrane compared to the other three molecules. Apart from tetracycline, which is largely hydrophilic, the other three molecules aggregate in water; however, only ?-mangostin can penetrate into the lipid tail region of the membrane. When it reaches a high concentration in the lipid tail region, ?-mangostin can form tubular clusters that span the two head group regions of the membrane, resulting in a large number of water translocations along the transmembrane aggregates. Structure-activity relationship analysis revealed two structural properties that characterize ?-mangostin, namely, the two isoprenyl groups and the polar groups present in the aromatic rings, which result in "disruptive amphiphilicity" and hence its excellent membrane activity. © 2018 American Chemical Society.
Source Title: ACS Omega
ISSN: 2470-1343
DOI: 10.1021/acsomega.7b01759
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
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