Structure of Peroxisomes
- Membrane: Single phospholipid bilayer enclosing the organelle.
- Matrix: Fine-granular interior containing oxidative enzymes.
- Enzymes: Includes oxidases (produce hydrogen peroxide) and catalase (breaks down hydrogen peroxide into water and oxygen).
- Size & Shape: Small, variable in size and number depending on cell type and metabolic needs.
- Distribution: Found in the cytoplasm of eukaryotic cells, especially abundant in liver and kidney cells.
Functions of Peroxisomes
- Detoxification: Break down hydrogen peroxide (H₂O₂), a toxic byproduct of metabolism, into harmless water and oxygen.
- Fatty Acid β-Oxidation: Degrades very long-chain fatty acids into shorter ones that mitochondria can further process.
- Lipid Metabolism: Involved in the biosynthesis of plasmalogens (important phospholipids in brain and heart tissue).
- Metabolism of Reactive Oxygen Species: Maintain cellular redox balance.
- Photorespiration (in plants): Plays a role in recycling carbon during photosynthesis.
- Seed Germination (plants): Help convert stored lipids into carbohydrates for energy.
- Purine Catabolism: Breaks down purines into uric acid.
- Specialized Roles: In some organisms, peroxisomes contribute to bioluminescence.
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