Effect of melittin on water diffusion and membrane structure in DMPC lipid bilayers

Z. N. Buck, J. Torres, A. Miskowiec, E. Mamontov, H. Kaiser, F. Y. Hansen, H. Taub*, M. Tyagi, L. Collins, K. W. Herwig

*Corresponding author for this work

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Abstract

Quasielastic neutron scattering (QENS) is well suited for studying the dynamics of water in proximity to supported membranes whose structure can be characterized by atomic force microscopy (AFM). Here we use QENS to investigate the effect of an adsorbed peptide (melittin) on water diffusion near a single-supported zwitterionic membrane (DMPC). Measurements of the incoherent elastic neutron intensity as a function of temperature provide evidence of bulk-like water freezing onto the melittin, which AFM images indicate coalesces into peptide-lipid domains as the peptide concentration increases. Analysis of the QENS spectra indicates that, at sufficiently high melittin concentrations, a water component diffusing more slowly than bulk-like water first freezes onto the bound melittin.
Original languageEnglish
Article number18002
JournalEpl
Volume123
Number of pages8
ISSN0295-5075
DOIs
Publication statusPublished - 2018

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