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Using cyclic voltammetry to probe the conformational transition of short elastin-like peptides
Sogol Asaei1, Caeden E Couch1, Elena Ising1
1Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, OH, USA.
Communications Chemistry
|April 1, 2026
Summary
This study developed a novel electrochemical sensing platform to detect conformational changes in short elastin-like polypeptides (ELPs) immobilized on gold surfaces, enabling new ways to study peptide behavior.
Area of Science:
- Biomaterials Science
- Protein Engineering
- Electrochemistry
Background:
- Elastin-like polypeptides (ELPs) are biomaterials inspired by tropoelastin, exhibiting stimuli-responsive inverse transition behavior.
- Detecting conformational changes in short, surface-immobilized ELPs remains a challenge.
- Existing methods may not fully capture the behavior of tethered ELPs.
Purpose of the Study:
- To develop and validate a novel electrochemical sensing platform for detecting conformational changes in short, surface-tethered ELPs.
- To investigate the stimuli-responsive transition behavior of engineered ELPs immobilized on gold surfaces.
- To correlate electrochemical signals with peptide conformational changes and solution-phase behavior.
Main Methods:
- Designed short ELPs with N-terminal cysteine for gold surface attachment and C-terminal tyrosine for electrochemical detection.
- Utilized cyclic voltammetry to monitor oxidative current changes related to ELP conformational transitions.
- Employed UV-visible spectrometry to compare solution-phase transition behavior with surface-bound ELP responses.
Main Results:
- Successfully demonstrated that electrochemical oxidation of tyrosine can indicate conformational changes in tethered ELPs.
- Observed modulated oxidative current corresponding to the inverse transition behavior of ELPs on the gold electrode.
- Validated the surface-based electrochemical findings with solution-phase UV-visible spectrometry data.
Conclusions:
- Developed a distinct electrochemical method for quantifying transition behavior of short, engineered ELPs on gold surfaces.
- The sensing platform effectively shows conformational changes of immobilized ELPs in response to stimuli.
- This approach offers a new avenue for studying and engineering surface-bound peptide systems.
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