Cholate Disrupts Regulatory Functions of Cytochrome c Oxidase
Rabia Ramzan1,2, Jörg Napiwotzki3, Petra Weber1
1Biochemical-Pharmacological Center, Cardiovascular Research Laboratory, Philipps-University Marburg, Karl-von-Frisch-Strasse 1, D-35043 Marburg, Germany.
Cells
|July 2, 2021
Summary
Cholate, used to purify cytochrome c oxidase (CytOx), alters its structure and function. This detergent disrupts ATP inhibition, impacting mitochondrial respiration and energy production.
Area of Science:
- Biochemistry
- Mitochondrial Biology
- Enzymology
Background:
- Cytochrome c oxidase (CytOx) is the rate-limiting enzyme in mitochondrial respiration.
- CytOx binds ADP and ATP, with some exchange occurring at high ATP/ADP ratios.
Purpose of the Study:
- To investigate the effect of cholate, a detergent used in CytOx purification, on the enzyme's structure and function.
- To understand how cholate influences ATP inhibition and its role in mitochondrial energy production.
Main Methods:
- Analysis of CytOx binding with ADP and ATP.
- Observation of structural and spectral changes induced by cholate.
- Investigating the effect of cholate on allosteric ATP inhibition.
Main Results:
- Cholate, used for CytOx purification, dimerizes the enzyme and causes spectral changes.
- Cholate treatment inhibits the allosteric ATP-inhibition of CytOx.
- This inhibition is normally regulated by cAMP-dependent phosphorylation.
Conclusions:
- Cholate significantly alters CytOx structure and function, affecting its allosteric regulation.
- Understanding cholate's effects provides insight into CytOx's role in regulating mitochondrial membrane potential and ROS formation.
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