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• W2031151497 abstract "A variety of biomolecules mediate physiological processes by inserting and reorganizing in cell membranes, and the thermodynamic forces responsible for their partitioning are of great interest. Recent experiments provided valuable data on the free energy changes associated with the transfer of individual amino acids from water to membrane. However, a complete picture of the pathways and the associated changes in energy of peptide insertion into a membrane remains elusive. To this end, computational techniques supplement the experimental data with atomic-level details and shed light on the energetics of insertion. Here, we employed the technique of umbrella sampling in a total 850 ns of all-atom molecular dynamics simulations to study the free energy profile and the pathway of insertion of a model hexapeptide consisting of a tryptophan and five leucines (WL5). The computed free energy profile of the peptide as it travels from bulk solvent through the membrane core exhibits two minima: a local minimum at the water−membrane interface or the headgroup region and a global minimum at the hydrophobic−hydrophilic interface close to the lipid glycerol region. A rather small barrier of roughly 1 kcal mol−1 exists at the membrane core, which is explained by the enhanced flexibility of the peptide when deeply inserted. Combining our results with those in the literature, we present a thermodynamic model for peptide insertion and aggregation which involves peptide aggregation upon contact with the membrane at the solvent−lipid headgroup interface." @default.
• W2031151497 created "2016-06-24" @default.
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• W2031151497 date "2008-08-01" @default.
• W2031151497 modified "2023-09-29" @default.
• W2031151497 title "Thermodynamics of Peptide Insertion and Aggregation in a Lipid Bilayer" @default.
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• W2031151497 doi "https://doi.org/10.1021/jp804710v" @default.
• W2031151497 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2651738" @default.
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• W2031151497 hasPublicationYear "2008" @default.
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