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Structure of Lipids03:38

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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases
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Human Dystrophin Structural Changes upon Binding to Anionic Membrane Lipids.

Raphael Dos Santos Morais1, Olivier Delalande2, Javier Pérez3

  • 1Université de Rennes, Rennes, France; Institut de Génétique et Développement de Rennes, CNRS UMR 6290, Rennes, France; Laboratoire Léon-Brillouin, UMR 12 CEA-CNRS, Université Paris-Saclay, CEA-Saclay, Gif-sur-Yvette, France; SWING Beamline, Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, Gif-sur-Yvette, France.

Biophysical Journal
|September 11, 2018
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Summary
This summary is machine-generated.

Dystrophin

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Area of Science:

  • Biophysics
  • Structural Biology
  • Muscle Cell Biology

Background:

  • Dystrophin is crucial for muscle sarcolemma integrity, and its absence causes Duchenne muscular dystrophy.
  • The protein's central domain contains spectrin-like repeats (R) involved in lipid interactions.

Purpose of the Study:

  • To investigate the structural changes of dystrophin repeats R1-3 upon binding to membrane lipids.
  • To understand the mechanism of sarcolemma anchoring and its implications for muscular dystrophy.

Main Methods:

  • Small-angle neutron scattering (SANS) with contrast variation.
  • Phospholipid-based bicelles and various phospholipid compositions.
  • Coarse-grained molecular dynamics simulations.

Main Results:

  • Dystrophin repeats R1-3 showed significant structural changes upon binding to anionic bicelles, with the gyration radius increasing.
  • Molecular dynamics simulations revealed an opening of the R1 coiled-coil repeat when bound to lipids.
  • The findings align with SANS and click chemistry/mass spectrometry data.

Conclusions:

  • The coiled-coil opening mechanism likely facilitates sarcolemma membrane anchoring during muscle contraction.
  • Understanding these structural dynamics can aid in developing gene therapies for muscular dystrophy.
  • This approach offers new avenues for studying membrane proteins.