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Title: The in vivo structure of biological membranes and evidence for lipid domains

Journal Article · · PLoS Biology (Online)
 [1];  [2];  [3];  [3];  [4];  [3];  [5];  [6]; ORCiD logo [7];  [8]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shull Wollan Center - A Joint Inst. for Neutron Sciences and Biology and Soft Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology and Soft Matter Division and Biosciences Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology and Soft Matter Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Molecular Biophysics; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Biochemistry & Cellular and Molecular Biology
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shull Wollan Center - A Joint Inst. for Neutron Sciences and Biology, Soft Matter Division, and Biosciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Biochemistry & Cellular and Molecular Biology
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biosciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Microbiology
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shull Wollan Center - A Joint Inst. for Neutron Sciences and Biology, Soft Matter Division, and Biosciences Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  8. Centro Nacional de Biotecnologia, Madrid (Spain)

Examining the fundamental structure and processes of living cells at the nanoscale poses a unique analytical challenge, as cells are dynamic, chemically diverse, and fragile. A case in point is the cell membrane, which is too small to be seen directly with optical microscopy and provides little observational contrast for other methods. As a consequence, nanoscale characterization of the membrane has been performed ex vivo or in the presence of exogenous labels used to enhance contrast and impart specificity. Here, we introduce an isotopic labeling strategy in the gram-positive bacterium Bacillus subtilis to investigate the nanoscale structure and organization of its plasma membrane in vivo. Through genetic and chemical manipulation of the organism, we labeled the cell and its membrane independently with specific amounts of hydrogen (H) and deuterium (D). These isotopes have different neutron scattering properties without altering the chemical composition of the cells. From neutron scattering spectra, we confirmed that the B. subtilis cell membrane is lamellar and determined that its average hydrophobic thickness is 24.3 ± 0.9 Ångstroms (Å). Furthermore, by creating neutron contrast within the plane of the membrane using a mixture of H- and D-fatty acids, we detected lateral features smaller than 40 nm that are consistent with the notion of lipid rafts. These experiments—performed under biologically relevant conditions—answer long-standing questions in membrane biology and illustrate a fundamentally new approach for systematic in vivo investigations of cell membrane structure.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1362249
Journal Information:
PLoS Biology (Online), Vol. 15, Issue 5; ISSN 1545-7885
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 102 works
Citation information provided by
Web of Science

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Cited By (15)

The role of traction in membrane curvature generation journal August 2018
Neutron scattering in the biological sciences: progress and prospects journal December 2018
Lipid rafts can form in the inner and outer membranes of Borrelia burgdorferi and have different properties and associated proteins: Borrelia inner and outer membrane lipid rafts have different properties journal February 2018
Microdomain formation is a general property of bacterial membrane proteins and induces heterogeneity of diffusion patterns journal September 2018
Immunocontraceptive target repertoire defined by systematic identification of sperm membrane alloantigens in a single species journal January 2018
Encoding biological recognition in a bicomponent cell-membrane mimic text January 2019
The Effect of Transmembrane Protein Shape on Surrounding Lipid Domain Formation by Wetting journal November 2019
Encoding biological recognition in a bicomponent cell-membrane mimic journal February 2019
The Role of Traction in Membrane Curvature Generation journal February 2018
The role of traction in membrane curvature generation posted_content June 2018
Palmitoylation is a post-translational modification of Alix regulating the membrane organization of exosome-like small extracellular vesicles journal December 2018
Composition Fluctuations in Lipid Bilayers journal December 2017
Fluid Phase Coexistence in Biological Membrane: Insights from Local Nonaffine Deformation of Lipids journal July 2018
Membrane Microdomain Disassembly Inhibits MRSA Antibiotic Resistance journal November 2017
Ultrastructural modeling of small angle scattering from photosynthetic membranes journal December 2019

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