jz6b00022_si_liveslides.zip (7.76 MB)
Water Hydrogen-Bonding Network Structure and Dynamics at Phospholipid Multibilayer Surface: Femtosecond Mid-IR Pump–Probe Spectroscopy
media
posted on 2016-02-19, 16:59 authored by Achintya Kundu, Bartosz Błasiak, Joon-Hyung Lim, Kyungwon Kwak, Minhaeng ChoThe water hydrogen-bonding network
at a lipid bilayer surface is
crucial to understanding membrane structures and its functional activities.
With a phospholipid multibilayer mimicking a biological membrane,
we study the temperature dependence of water hydrogen-bonding structure,
distribution, and dynamics at a lipid multibilayer surface using femtosecond
mid-IR pump–probe spectroscopy. We observe two distinguished
vibrational lifetime components. The fast component (0.6 ps) is associated
with water interacting with a phosphate part, whereas the slow component
(1.9 ps) is with bulk-like choline-associated water. With increasing
temperature, the vibrational lifetime of phosphate-associated water
remains constant though its relative fraction dramatically increases.
The OD stretch vibrational lifetime of choline-bound water slows down
in a sigmoidal fashion with respect to temperature, indicating a noticeable
change of the water environment upon the phase transition. The water
structure and dynamics are thus shown to be in quantitative correlation
with the structural change of liquid multibilayer upon the gel-to-liquid
crystal phase transition.
History
Usage metrics
Categories
Keywords
OD stretch vibrational lifetimetemperature dependencewater environmentphosphate partphospholipid multibilayervibrational lifetime componentslipid multibilayer surfacePhospholipid Multibilayer Surfaceunderstanding membrane structureslipid bilayer surfacewater structurevibrational lifetimesigmoidal fashionphase transition
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC