Surface tension effect on transmembranes channel stability in a model membrane

Article Abstract:

The effect of surface tension on a palmitololelylphosphatidylcholine (POPC) bilayer membrane containing a four-helix transmembrane alamethicin peptide is investigated. Results suggest that when the membrane is under surface tension, the peptide helical structure is perturbed from that in the tension-free state but that the bundle conformation is more stable than that in the tension-free state, with hydrogen bonding playing an important stabilizing role.

Membrane proteins, Conformational analysis, Thermal properties, Choline, Structure

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Structure, selectivity, and solvation of a model chiral stationary phase

Article Abstract:

The presence of chirality at an interface enables a surface to distinguish between enantiomers and the mechanism by which this selectivity occurs is complicated by the surface morphology, the possible involvement of the solvent, and the characteristics of the chiral molecules at the surface. Ab initio studies provide descriptions of the hydrogen bonding between PEPU molecules at the interface.

Methods, Chirality, Solvation, Enantiomers

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The Microscopic switching mechanism of a [2]catenane

Article Abstract:

Numerical simulation at an all-atom level was applied to study the switching mechanism of a [2]catenane. Along the path that connected the product and reactant state, several intermediate states were found which were characterized by pi-pi stacking interactions and hydrogen bonds.

Numerical analysis, Chemical properties, Catenanes

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