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Related Experiment Video

Updated: Jun 25, 2026

Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools

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Fast structural dynamics in reduced and oxidized cytochrome c.

Weixia Liu¹, Jon N Rumbley, S Walter Englander

¹Department of Biochemistry and Biophysics, Johnson Research Foundation, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6059, USA.

Protein Science : a Publication of the Protein Society

|February 26, 2009

Summary

Cytochrome c’s structure remains rigid in both reduced and oxidized states, indicating minimal changes in protein dynamics during electron transfer. This rigidity suggests solvent reorganization energy is small and dynamic relief mechanisms are not active.

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Area of Science:

Biochemistry
Structural Biology
Protein Dynamics

Background:

Cytochrome c is a crucial protein in cellular respiration and apoptosis.
Understanding its redox-dependent structural dynamics is key to elucidating electron transfer mechanisms.
Previous studies suggested potential dynamic changes influencing electron transfer efficiency.

Purpose of the Study:

To characterize the sub-nanosecond structural dynamics of reduced and oxidized cytochrome c.
To investigate how changes in redox state affect protein backbone and side-chain dynamics.
To assess the role of protein dynamics and solvent reorganization in cytochrome c's electron transfer.

Main Methods:

Amide (15)N relaxation measurements to probe protein backbone dynamics.
Deuterium relaxation of methyl groups to assess side-chain dynamics.
Analysis of sub-nanosecond timescale structural dynamics.

Main Results:

Dynamic properties of the protein backbone and side chains showed minimal changes between reduced and oxidized cytochrome c.
The protein exhibited relative rigidity in both redox states.
These findings suggest that solvent reorganization energy is small and dynamic relief of electron transfer pathway interference is not a significant factor in free cytochrome c.

Conclusions:

The structural dynamics of cytochrome c are largely independent of its redox state on the sub-nanosecond timescale.
The observed rigidity implies a small solvent reorganization energy, supporting theoretical predictions.
Dynamic relief mechanisms do not appear to play a significant role in modulating electron transfer in free cytochrome c.