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Models and Methods to Evaluate Transport of Drug Delivery Systems Across Cellular Barriers
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Published on: October 17, 2013

Functional interactions between membrane-bound transporters and membranes.

Linda Näsvik Ojemyr1, Hyun Ju Lee, Robert B Gennis

  • 1Department of Biochemistry and Biophysics, Stockholm University, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|August 28, 2010
PubMed
Summary

Cellular membranes store energy via ion gradients. This study reveals membranes accelerate proton transfer in cytochrome c oxidase, acting as a key component in energy conversion.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Bioenergetics

Background:

  • Cellular membranes maintain electrochemical ion gradients, storing free energy essential for ATP generation and transmembrane transport.
  • Proton-transport proteins in the respiratory chain, like cytochrome c oxidase, are crucial for maintaining these gradients in mitochondria and bacteria.
  • The precise role of protein-membrane and protein-protein interactions in these processes remains largely unexplored.

Purpose of the Study:

  • To investigate the impact of membrane incorporation on proton-transfer reactions within the membrane-bound enzyme, cytochrome c oxidase.
  • To elucidate the specific contribution of the membrane environment to the function of proton pumps.

Main Methods:

  • Studied proton transfer reactions in the membrane-bound enzyme cytochrome c oxidase.
  • Analyzed the influence of membrane incorporation on enzyme kinetics and proton pathway dynamics.

Main Results:

  • Membrane incorporation significantly accelerates proton transfer into the catalytic site of cytochrome c oxidase.
  • Specific amino acid residues within the enzyme create an intramolecular proton pathway linked to the membrane surface.
  • The membrane acts as more than an insulator, actively participating in the proton transfer mechanism.

Conclusions:

  • The cellular membrane is an active component of the energy-conversion machinery, not merely a passive barrier.
  • Membrane-mediated interactions enhance the efficiency of proton transfer in enzymes like cytochrome c oxidase.
  • Understanding these interactions is critical for comprehending cellular energy generation and transport processes.