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pH-dependent conformational changes of ferricytochrome c induced by electrode surface microstructure
Xiue Jiang1, Xiaohu Qu, Lei Zhang
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.
Biophysical Chemistry
|July 2, 2004
Summary
This study reveals how single-wall carbon nanotubes (SWNTs) stabilize bovine heart ferricytochrome c. Functionalized SWNTs on electrodes maintain the protein's native structure during pH changes, crucial for understanding its function.
Area of Science:
- Biophysical Chemistry
- Materials Science
- Electrochemistry
Background:
- Bovine heart ferricytochrome c is vital in electron transport.
- Understanding its pH-dependent conformational changes is key to its function.
- Carbon nanomaterials offer unique platforms for biomolecule studies.
Purpose of the Study:
- To investigate pH-dependent processes of bovine heart ferricytochrome c.
- To explore the role of functionalized single-wall carbon nanotubes (SWNTs) in stabilizing protein structure.
- To analyze conformational changes using spectroscopic methods on a modified electrode.
Main Methods:
- Utilized electronic absorption and circular dichroism (CD) spectroscopy.
- Employed functionalized single-wall carbon nanotubes (SWNTs) modified glass carbon electrode (SWNTs/GCE).
- Analyzed in situ CD spectra using singular value decomposition least square (SVDLS) for conformational distribution.
Main Results:
- Spectra from SWNTs/GCE reflected pH-induced protein conformational changes and heme microenvironment.
- The pK(a) of alkaline transition was determined.
- Functionalized SWNTs demonstrated the ability to retain the native conformational stability of ferricytochrome c.
Conclusions:
- Functionalized SWNTs provide a stable platform for studying pH-dependent protein behavior.
- The electrode surface microstructure influences pH-induced conformational changes.
- SWNTs can preserve the native structure of ferricytochrome c during alkaline transitions.