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Spectrophotometric detection of the interaction between cytochrome c and heparin
1Institute of Experimental Physics, Slovak Academy of Sciences, Kosice, Czechoslovakia.
Insights
Heparin interferes with cellular respiration by binding to cytochrome c, inhibiting electron transport. This interaction affects cytochrome c
Area of Science:
- Biochemistry
- Cellular Respiration
- Molecular Interactions
Background:
- Cytochrome c is crucial for electron transport in cellular respiration.
- Heparin is known to interact with proteins.
- The specific interaction between heparin and cytochrome c and its functional consequences require elucidation.
Purpose of the Study:
- To investigate the inhibitory effect of heparin on the electron transport chain.
- To characterize the interaction between heparin and cytochrome c.
- To determine the functional significance of this interaction.
Main Methods:
- Spectroscopic analysis (Soret region spectrum changes) to detect heparin-cytochrome c binding.
- Affinity chromatography using immobilized cytochrome c to fractionate heparin.
- Assays to observe the effect of heparin on electron transport.
Main Results:
- Heparin inhibits electron transport from reduced cytochrome c to cytochrome c oxidase.
- Heparin binds to both reduced and oxidized forms of cytochrome c, altering its spectral properties.
- Commercial heparin contains both low- and high-affinity fractions that interact with cytochrome c.
- Polylysine can disrupt the cytochrome c-heparin complex.
Conclusions:
- Heparin's inhibition of electron transport is mediated by direct interaction with cytochrome c.
- The binding involves distinct affinity states of heparin.
- The cytochrome c-heparin complex can be destabilized by polylysine, suggesting potential therapeutic or research applications.
Abstract:
Heparin inhibits transport of electrons from reduced cytochrome c to cytochrome c oxidase. The effect is due to the interaction of heparin with cytochrome c. It has been observed that binding of heparin to the reduced or oxidized cytochrome c changes the spectrum of cytochrome c at the Soret region. Affinity chromatography of heparin in cytochrome c immobilized to thiol-Sepharose shows that commercial heparin is eluted in the low-affinity and high-affinity fractions. Both participate in the interaction with cytochrome c. Polylysine induces decay of the cytochrome c-heparin complex.