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Electron transfer in proteins

H B Gray¹, J R Winkler

¹Beckman Institute, California Institute of Technology, Pasadena 91125, USA.

Annual Review of Biochemistry

|January 1, 1996

Summary

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Electron transfer (ET) reactions are vital in biology. Protein structure and environment significantly impact ET rates by influencing nuclear reorganization energy and electronic coupling strength.

Area of Science:

Biophysical Chemistry
Protein Electron Transfer
Bioenergetics

Background:

Electron transfer (ET) reactions are fundamental to biological processes like photosynthesis and respiration.
ET rates are theoretically described by nuclear reorganization energy (lambda) and electronic coupling strength (HAB).

Purpose of the Study:

To investigate the influence of protein environment and secondary structure on ET parameters (lambda and HAB).
To analyze ET reactions in ruthenium-modified metalloproteins (cytochrome c, myoglobin, azurin).

Main Methods:

Utilized theoretical formalism to analyze ET rates in metalloproteins.
Studied ruthenium-modified proteins to probe lambda and HAB.

Main Results:

Related Experiment Videos

Protein reorganization energies are sensitive to the surrounding medium, with aqueous environments causing larger reorganization energies.
Electronic coupling strength is influenced by protein secondary structure; beta sheets mediate coupling more effectively than alpha-helices.
Hydrogen bonds play a critical role in mediating electronic coupling.

Conclusions:

Protein environment and secondary structure are critical determinants of electron transfer efficiency.
Understanding these factors is key to elucidating biological electron transfer mechanisms.