Effects of carotenoids on lipid bilayers
- National Institute for Mathematical and Biological Synthesis; University of Tennessee; Knoxville; USA; Center for Molecular Biophysics
- Center for Molecular Biophysics; Oak Ridge National Lab; Oak Ridge; USA
- Department of Biochemistry and Cellular & Molecular Biology; University of Tennessee; Knoxville; USA
- 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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