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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
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DNA binding to zwitterionic model membranes.

Marie-Louise Ainalem1, Nora Kristen, Karen J Edler

  • 1Physical Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden. marielouise.ainalem@fkem1.lu.se

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DNA adsorbs to phospholipid membranes, with its structure and location depending on salt type. Divalent calcium ions promote denser DNA films and vesicle changes, while monovalent sodium ions lead to extended DNA coils on the membrane surface.

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Published on: October 26, 2016

Area of Science:

  • Biophysics
  • Materials Science
  • Molecular Biology

Background:

  • Understanding DNA-membrane interactions is crucial for biomaterials and drug delivery.
  • Phospholipid bilayers serve as model systems for cell membranes.
  • The influence of ionic strength on these interactions is a key area of research.

Purpose of the Study:

  • To investigate the adsorption behavior of DNA onto model phospholipid membranes.
  • To elucidate the role of monovalent (Na+) and divalent (Ca2+) cations in DNA-membrane interactions.
  • To compare DNA adsorption mechanisms in different ionic environments.

Main Methods:

  • In situ studies using null ellipsometry, quartz crystal microbalance with dissipation, and neutron reflectometry.
  • Cryo-transmission electron microscopy (Cryo-TEM) and small-angle neutron scattering (SANS) for bulk solution analysis.
  • Utilizing linearized plasmid and salmon sperm DNA with zwitterionic liquid crystalline phospholipid bilayers.

Main Results:

  • DNA adsorbs to phospholipid bilayers in both Na+ and Ca2+ solutions.
  • In Na+, DNA forms an extended coil on the membrane surface with high solvent content.
  • In Ca2+, DNA adsorption is denser, driven electrostatically, and induces changes in vesicle structure, including intercalation.
  • SANS did not detect DNA adsorption in Na+ solutions, but Cryo-TEM showed DNA between vesicles.

Conclusions:

  • The type of cation significantly influences DNA adsorption mechanisms and the resulting structural organization.
  • Electrostatic and hydrophobic forces play roles in DNA-membrane interactions, varying with ionic conditions.
  • DNA can induce structural rearrangements in model membrane systems, particularly in the presence of divalent cations.