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Long-range electron transfer in heme proteins.

S L Mayo, W R Ellis, R J Crutchley

    Science (New York, N.Y.)
    |August 29, 1986
    PubMed
    Summary
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    Electron transfer occurs over large distances within proteins. Research shows transfer rates depend on distance, structural changes, and thermodynamics, with faster rates for minimal structural changes.

    Area of Science:

    • Biochemistry and Biophysics
    • Molecular Biology

    Background:

    • Electron transfer is fundamental in biological processes.
    • Long-range electron transfer through protein interiors has been experimentally verified.

    Purpose of the Study:

    • To investigate factors influencing long-range electron transfer rates in proteins.
    • To understand the relationship between protein structure and electron transfer efficiency.

    Main Methods:

    • Kinetic experiments were employed to measure electron transfer rates.
    • Theoretical analysis was used to model electron transfer dynamics.
    • Studies focused on modified proteins and protein complexes, including heme proteins.

    Main Results:

    • Electron transfer can occur over distances greater than 10 angstroms through protein interiors.

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  • Electron transfer rates decrease exponentially with increasing donor-acceptor distance.
  • Proteins with minimal structural changes upon electron transfer exhibit significantly enhanced rates.

    • Conclusions:

    • Protein structure plays a critical role in modulating long-range electron transfer.
    • Understanding these factors is key to designing and engineering proteins for specific electron transfer functions.