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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and Golgi...
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Automated Lipid Bilayer Membrane Formation Using a Polydimethylsiloxane Thin Film
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Published on: July 10, 2016

Cooperative binding at lipid bilayer membrane surfaces.

Emma L Doyle1, Christopher A Hunter, Helen C Phillips

  • 1Centre for Chemical Biology, Krebs Institute for Biomolecular Science, Department of Chemistry, The University of Sheffield, Sheffield, S3 7HF, U.K.

Journal of the American Chemical Society
|April 10, 2003
PubMed
Summary

Synthetic receptors bind copper(II) ions more effectively on membranes than in solution. Cells can control biological responses by adjusting receptor concentration, influencing copper(II) ion cluster formation.

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Area of Science:

  • Biophysical Chemistry
  • Supramolecular Chemistry
  • Membrane Biophysics

Background:

  • Copper(II) ions play crucial roles in biological systems.
  • Membrane-bound receptors mediate cellular responses to external stimuli.
  • Understanding metal-ligand interactions at interfaces is vital for cell signaling.

Purpose of the Study:

  • To investigate the binding of copper(II) ions to synthetic receptors embedded in a membrane.
  • To quantify the binding affinity and stoichiometry at the membrane-water interface.
  • To elucidate the factors influencing copper(II) complexation and its implications for cellular processes.

Main Methods:

  • Utilized synthetic receptors immobilized in a membrane environment.
  • Employed spectroscopic techniques to monitor copper(II) ion binding.
  • Analyzed binding isotherms to determine complexation constants and stoichiometry.
  • Compared membrane-bound versus solution-phase binding.

Main Results:

  • Complexation followed a 4:1 receptor:copper(II) model.
  • Binding constants were significantly enhanced at the membrane interface compared to solution.
  • Enhanced binding is attributed to membrane's low polarity and concentrating effect.
  • Complex stoichiometry is sensitive to receptor concentration, affecting binding affinity.

Conclusions:

  • Membrane environment dramatically influences copper(II) ion binding to synthetic receptors.
  • Cells can modulate biological responses, like chemotaxis, by tuning receptor density.
  • Receptor-ligand cluster size, influenced by concentration, is a key regulatory mechanism.