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Effects of carotenoids on lipid bilayers

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/c7cp07126d· OSTI ID:1492842
 [1];  [2];  [3];  [4];  [2]
  1. National Institute for Mathematical and Biological Synthesis; University of Tennessee; Knoxville; USA; Center for Molecular Biophysics
  2. Center for Molecular Biophysics; Oak Ridge National Lab; Oak Ridge; USA
  3. Department of Biochemistry and Cellular & Molecular Biology; University of Tennessee; Knoxville; USA
  4. Center for Molecular Biophysics; Oak Ridge National Lab; Oak Ridge; USA; Department of Biochemistry and Cellular & Molecular Biology

Carotenoids have been found to be important in improving the integrity of biomembranes in eukaryotes. However, the molecular details of how carotenoids modulate the physical properties of biomembranes are unknown. To this end, we have conducted a series of molecular dynamics simulations of different biologically-relevant membranes in the presence of carotenoids. The carotenoid effect on the membrane was found to be specific to the identity of the carotenoid and the composition of the membrane itself. Therefore, different classes of carotenoids produce a different effect on the membrane, and different membrane phases are affected differently by carotenoids. It is apparent from our data that carotenoids do trigger the bilayer to become thinner. The mechanism by which this occurs depends on two competing factors, the ability of the lipid tails of opposing monolayers to either (1) compress or (2) interdigitate as the bilayer condenses. Indeed, carotenoids directly influence the physical properties via these two mechanisms, thus compacting the bilayer. However, the degree to which these competing mechanisms are utilized depends on the bilayer phase and the carotenoid identity.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
DOE Contract Number:
AC02-05CH11231; AC05-00OR22725
OSTI ID:
1492842
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 5 Vol. 20; ISSN 1463-9076; ISSN PPCPFQ
Country of Publication:
United States
Language:
English

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Cited By (3)

The non‐homogenous distribution and aggregation of carotenoids in the stratum corneum correlates with the organization of intercellular lipids in vivo journal September 2019
In Search for the Membrane Regulators of Archaea journal September 2019
The interactions of an Aβ protofibril with a cholesterol-enriched membrane and involvement of neuroprotective carbazolium-based substances journal January 2019

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