1. Proteins:
* Enzymes: Mitochondria house a vast array of enzymes involved in crucial metabolic processes like:
* Krebs cycle: Citrate synthase, isocitrate dehydrogenase, α-ketoglutarate dehydrogenase, succinyl CoA synthetase, succinate dehydrogenase, fumarase, malate dehydrogenase.
* Electron transport chain: NADH dehydrogenase, cytochrome c reductase, cytochrome c oxidase.
* ATP synthesis: ATP synthase.
* Fatty acid oxidation: β-oxidation enzymes.
* Structural proteins: Proteins that maintain mitochondrial structure, such as porins in the outer membrane and components of the inner membrane cristae.
* Transport proteins: Proteins responsible for moving molecules across mitochondrial membranes, like carriers for pyruvate, ADP, ATP, and other metabolites.
2. Lipids:
* Phospholipids: Form the structural basis of the inner and outer mitochondrial membranes.
* Cardiolipin: A unique phospholipid found primarily in the inner membrane, important for maintaining membrane integrity and supporting electron transport chain activity.
* Steroids: Cholesterol and other sterols play a role in membrane fluidity and function.
3. Nucleic Acids:
* Mitochondrial DNA (mtDNA): A circular DNA molecule containing genes encoding for some mitochondrial proteins, ribosomal RNAs, and transfer RNAs.
* RNA: Mitochondria have their own RNA polymerase and ribosomes to transcribe and translate their own genes.
4. Carbohydrates:
* Sugars: Mitochondria utilize glucose and other sugars as fuel for ATP production.
5. Other Biomolecules:
* Coenzymes: Mitochondria utilize various coenzymes, including NAD+, FAD, and CoA, essential for many enzymatic reactions.
* Metal Ions: Iron, copper, and other metals are crucial components of electron transport chain proteins.
Note: The specific composition and quantity of these biomolecules vary depending on the type of cell and its metabolic demands.
