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Title: Revealing the mechanism of passive transport in lipid bilayers via phonon-mediated nanometre-scale density fluctuations

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms11575· OSTI ID:1237168
 [1];  [1];  [2];  [3];  [4];  [1];  [5];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
  3. Inst. of Nanoscience and Cryogenics, Grenoble (France)
  4. Petersburg Nuclear Physics Inst. Gatchina (Russia)
  5. European Synchrotron Radiation Facility (ESRF), Grenoble (France)

The passive transport of molecules through a cell membrane relies on thermal motions of the lipids. However, the nature of transmembrane transport and the precise mechanism remain elusive and call for a comprehensive study of phonon excitations. Here we report a high resolution inelastic X-ray scattering study of the in-plane phonon excitations in 1,2-dipalmitoyl-sn-glycero-3-phosphocholine above and below the main transition temperature. In the gel phase, for the first time, we observe low-frequency transverse modes, which exhibit a phonon gap when the lipid transitions into the fluid phase. We argue that the phonon gap signifies the formation of short-lived nanometre-scale lipid clusters and transient pores, which facilitate the passive molecular transport across the bilayer plane. Finally, our findings suggest that the phononic motion of the hydrocarbon tails provides an effective mechanism of passive transport, and illustrate the importance of the collective dynamics of biomembranes.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Russian Foundation for Basic Research
Grant/Contract Number:
SC0012704
OSTI ID:
1237168
Alternate ID(s):
OSTI ID: 1340385
Report Number(s):
BNL-108276-2015-JA; BNL-112571-2016-JA; R&D Project: LS001
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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Cited By (6)

Molecular Dynamics of POPC Phospholipid Bilayers through the Gel to Fluid Phase Transition: An Incoherent Quasi-Elastic Neutron Scattering Study journal January 2017
Large-scale simulation of biomembranes: bringing realistic kinetics to coarse-grained models journal October 2019
Dynamic structure factor of a lipid bilayer in the presence of a high electric field journal December 2019
On the nanoscale relaxation dynamics of a lipid bilayer journal July 2017
Functional lipid pairs as building blocks of phase-separated membranes journal February 2020
Aspirin locally disrupts the liquid-ordered phase journal February 2018

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