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GAPDH: the missing link between glycolysis and mitochondrial oxidative phosphorylation?
Rabia Ramzan1, Petra Weber, Uwe Linne
1*Cardiovascular Research Laboratory, Biomedical Research Center, Philipps-University Marburg, Marburg 35043, Germany.
Biochemical Society Transactions
|September 25, 2013
Summary
This study proposes a link between glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and cytochrome c oxidase (CytOx), key enzymes in cellular energy production. Their interaction may explain energy deregulation and disease development under oxidative stress.
Area of Science:
- Biochemistry
- Cellular Metabolism
- Mitochondrial Function
Background:
- Glycolysis and oxidative phosphorylation are primary ATP production pathways.
- Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and cytochrome c oxidase (CytOx) are key enzymes in these pathways.
- Both GAPDH and CytOx are deregulated under oxidative stress.
Purpose of the Study:
- To propose a link between GAPDH and CytOx in cellular energy regulation.
- To investigate the role of GAPDH-CytOx interaction in disease pathogenesis.
Main Methods:
- Mass spectrometry (MS) analysis.
- Blue native polyacrylamide gel electrophoresis (BN-PAGE) for complex isolation.
- Analysis of bovine heart tissue homogenates.
Main Results:
- GAPDH was found associated with a BN-PAGE isolated CytOx complex.
- GAPDH protein damage decreases cellular ATP levels.
- Altered ATP/ADP ratio impacts CytOx activity, ROS production, and apoptosis.
Conclusions:
- The interaction between GAPDH and CytOx represents a potential regulatory link in cellular energy metabolism.
- This interaction may contribute to the development of diseases associated with oxidative stress and energy imbalance.
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