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Related Experiment Video

Updated: Jul 7, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

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Published on: June 27, 2014

Accelerated Directional Proton-Coupled Electron Transfer Enabled by Intrinsic Dipole Field in Biomimetic α-Helical

Hengyuan Bai¹, Weiran Zhang¹, Yang Li¹

¹State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.

Journal of the American Chemical Society

|July 6, 2026

Summary

Researchers developed a biomimetic strategy using an alpha-helical peptide scaffold to control proton-coupled electron transfer (PCET). The peptide’s dipole field accelerates PCET, offering precise control over energy conversion processes.

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Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

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Area of Science:

Biomimetic chemistry
Molecular biophysics
Energy conversion

Background:

Proton-coupled electron transfer (PCET) is crucial for biological energy processes like photosynthesis and respiration.
Precise regulation of PCET via molecular conformation is a significant scientific challenge.
Understanding structure-field-function relationships in photoinduced PCET is essential for developing efficient energy systems.

Purpose of the Study:

To develop a biomimetic strategy for modulating intramolecular PCET using an alpha-helical peptide scaffold.
To investigate the role of an intrinsic dipole field within an alpha-helix in regulating PCET.
To establish a molecular model for controlling energy conversion through structural dipoles.

Main Methods:

Grafting rhodamine dyes onto a designed peptide backbone (Pep-Rh) to form a stable alpha-helical structure.
Utilizing spectroscopic, electrochemical, and theoretical analyses to study PCET mechanisms.
Comparing the performance of the helical peptide system with nonhelical analogues.

Main Results:

The designed alpha-helical peptide (Pep-Rh) generated a well-defined intrinsic dipole field aligned with the proton transfer pathway.
This dipole field significantly accelerated intramolecular PCET compared to nonhelical small molecules and polymers.
The study demonstrated enhanced PCET efficiency due to the alpha-helix's structural dipole.

Conclusions:

A novel biomimetic strategy effectively modulates PCET using an alpha-helical peptide scaffold.
The intrinsic dipole field of the alpha-helix plays a key role in accelerating PCET.
This work provides a framework for precise control of energy conversion and understanding structure-field-function relationships in photoinduced PCET systems.