Mitochondrial Electron Transport: The Random Collision Model

  • Charles R. Hackenbrock
  • Sharmila Shaila Gupte
  • Brad Chazotte


Data are presented which represent the experimental basis for the random collision model of mitochondrial electron transport. The random collision model rejects the notion that permanent assemblies or transient aggregates of redox components are necessary to account for the sequence or rate of electron transport in the inner membrane. The five fundamental postulates upon which the random collision model is founded are presented: (1) All redox components are independent lateral diffusants; (2) Cytochrome c diffuses primarily in three dimensions; (3) Electron transport is a diffusion-coupled kinetic process; (4) Electron transport is a multicollisional, obstructed, long-range diffusional process; (5) The rates of diffusion of the redox components have a direct influence on the overall kinetic process of electron transport and can be rate limiting, as in diffusion control. The experimental results obtained in testing each of the five postulates of the random collision model are presented. It is concluded that mitochondrial electron transport is a diffusion-based random collision process and that diffusion has an integral and controlling effect on electron transport.


Ionic Strength Electron Transport Collision Frequency Fluorescence Recovery Redox Partner 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Charles R. Hackenbrock
    • 1
  • Sharmila Shaila Gupte
    • 1
  • Brad Chazotte
    • 1
  1. 1.Laboratories for Cell Biology Department of Anatomy, School of MedicineThe University of North Carolina at Chapel HillChapel HillUSA

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