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Perchlorate binding to cytochrome c: a magnetic and optical study
European Journal of Biochemistry
|September 1, 1980
Summary
Perchlorate ions bind specifically to cytochrome c, altering its alkaline conformation and creating new binding sites. These interactions are pH and concentration-dependent, influencing the protein
Area of Science:
- Biochemistry
- Spectroscopy
- Protein Chemistry
Background:
- Cytochrome c is a crucial protein in cellular respiration.
- Understanding interactions with small molecules like perchlorate is vital for elucidating its function.
Purpose of the Study:
- To investigate the specific binding effects of perchlorate on cytochrome c.
- To characterize the conformational changes induced by perchlorate.
Main Methods:
- Utilized 1H and 35Cl Nuclear Magnetic Resonance (NMR) spectroscopy.
- Employed electron paramagnetic resonance (EPR) and optical spectroscopy.
- Conducted competition experiments with chloride ions.
Main Results:
- Perchlorate binding alters the pK values of cytochrome c's alkaline conformation.
- Perchlorate exhibits higher affinity for the alkaline form, revealing a new binding site near the heme crevice.
- The neutral ferricytochrome c form also binds perchlorate, indicated by a pH and concentration-dependent high-spin signal.
Conclusions:
- Perchlorate ions bind specifically to both neutral and alkaline forms of cytochrome c.
- These specific binding interactions are responsible for the observed effects on cytochrome c's structure and properties.