Related Experiment Videos
Electron tunneling chains of mitochondria
Christopher C Moser1, Tammer A Farid, Sarah E Chobot
1The Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, 1005, Stellar-Chance Laboratories, 422, Curie Boulevard, Philadelphia, PA 19104-6059, USA. moserc@mail.med.upenn.edu
Biochimica Et Biophysica Acta
|June 20, 2006
Summary
Natural selection optimizes distances between redox cofactors for efficient electron transfer in proteins. These precise distances control electron flow, directing or insulating single electrons for biological functions.
Area of Science:
- Biochemistry
- Molecular Biology
- Bioenergetics
Background:
- Electron transfer proteins are crucial for biological energy conversion.
- Understanding the principles governing electron transfer distances is key to protein design.
Purpose of the Study:
- To elucidate the role of natural selection in determining distances between redox cofactors.
- To provide a unifying concept for natural electron transfer protein design.
Main Methods:
- Analysis of electron transfer principles.
- Examination of cofactor distances in protein structures.
- Tunneling simulations of respiratory complexes.
Main Results:
- Natural selection adjusts cofactor distances to direct or insulate electron tunneling.
- Distances of 14 Å or less are common for efficient electron transfer along a chain.
- Longer distances prevent short-circuiting and can serve regulatory roles.
Conclusions:
- The precise spacing of redox cofactors is a fundamental design principle dictated by natural selection.
- This principle explains electron transfer efficiency and regulation in biological systems.
- Simulations confirm the role of distance in electron tunneling within respiratory complexes.