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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
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Location and orientation of Triclosan in phospholipid model membranes

Jaime Guillén1, Angela Bernabeu, Stuart Shapiro

  • 1Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, 03202 Elche-Alicante, Spain.

European Biophysics Journal : EBJ
|January 10, 2004
PubMed

Insights

Triclosan, an antibacterial agent, inserts into the upper region of phospholipid membranes. This intercalation likely disrupts bacterial cell membrane integrity, contributing to its antimicrobial effects.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Membrane Biophysics

Background:

  • Triclosan is a widely used hydrophobic antibacterial agent in consumer products.
  • Its antibacterial mechanism is often attributed to fatty acid biosynthesis inhibition.
  • Previous research suggested Triclosan's antibacterial action involves membrane effects.

Purpose of the Study:

  • To determine the precise location of Triclosan within phospholipid model membranes.
  • To investigate the interaction between Triclosan and membrane components at a molecular level.

Main Methods:

  • Utilized high-resolution magic-angle spinning natural abundance (13)C NMR spectroscopy.
  • Embedded Triclosan in egg yolk lecithin model membranes.
  • Measured (13)C spin-lattice relaxation times in the presence of Gadolinium (Gd3+) ions.

Main Results:

  • Triclosan localizes to the upper region of the phospholipid membrane.
  • The hydroxyl group of Triclosan is near the C=O/C2 carbons of the phospholipid acyl chain.
  • Triclosan aligns nearly perpendicularly to the phospholipid molecule.

Conclusions:

  • Triclosan's membrane localization and orientation support its membranotropic effects.
  • Intercalation into bacterial cell membranes likely compromises their functional integrity.
  • Membrane disruption contributes significantly to Triclosan's antibacterial activity.

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