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Title: Molecular insights into the membrane affinities of model hydrophobes
Authors: Li, Jianguo
Beuerman, Roger W.
Verma, Chandra Shekhar
Keywords: Membrane Affinities
Science::Biological sciences
Issue Date: 2018
Source: Li, J., Beuerman, R. W., & Verma, C. S. (2018). Molecular insights into the membrane affinities of model hydrophobes. ACS Omega, 3(3), 2498-2507. doi:10.1021/acsomega.7b01759
Series/Report no.: ACS Omega
Abstract: Membrane-active antibiotics are of great interest in fighting bacterial resistance. α-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 α-mangostin with a model bacterial membrane and compare it with the mechanisms of three hydrophobic molecules (ciprofloxacin, xanthone, and tetracycline). We find that α-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 α-mangostin can penetrate into the lipid tail region of the membrane. When it reaches a high concentration in the lipid tail region, α-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 α-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.
Rights: © 2018 American Chemical Society. This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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