title: Molecular dynamics study of surfactin monolayer at the air/water interface.
abstract: The surface parameter of protonated surfactin molecules and the structural properties of the protonated surfactin monolayer adsorbed at the air/water interface have been studied by molecular dynamics simulation. The simulation was performed at 293 K and the interfacial concentration of surfactin was set in a range of 0.70-2.20 nm(2) molecule(-1). The results show that the interfacial concentration greatly affects the molecular orientation of surfactin, the structure of the peptide ring backbone and the spatial arrangement of the surfactin monolayer. The peptide ring backbone of the surfactin molecule exhibits a structural flexibility, and a more packed structure is adopted at higher interfacial concentration. The hydrophobic contacts between surfactin molecules and the stability of the secondary structures, β-turn structure in Leu2 → Asp5 and the β-sheet domains, are enhanced when the surfactin molecules are in a very packed situation.
authors.affiliation: State Key Laboratory of Bioreactor Engineering and Institute of Applied Chemistry, East China University of Science and Technology, Shanghai, People's Republic of China.
authors.forename: Hong-Ze
authors.initials: HZ
authors.lastname: Gang
authors.forename: Jin-Feng
authors.initials: JF
authors.lastname: Liu
authors.forename: Bo-Zhong
authors.initials: BZ
authors.lastname: Mu
mesh_terms: D000327:Adsorption; D000388:Air; D055666:Lipopeptides / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D010456:Peptides, Cyclic / Q000737:chemistry*; D017433:Protein Structure, Secondary; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D055666:Lipopeptides; D010456:Peptides, Cyclic; D013501:Surface-Active Agents; D014867:Water; C009365:surfactin peptide