Science Fair Project Encyclopedia
In biochemistry, a metabolic pathway is a series of chemical reactions occurring within a cell, catalyzed by enzymes, and resulting in either the formation of a metabolic product to be used or stored by the cell (metabolic sink ), or the initiation of another metabolic pathway (then called a flux generating step).
Most metabolic pathways have these common properties:
- They are irreversible, usually because the first step is a committed step that only runs in one direction.
- The pathways are regulated, usually by feedback inhibition .
- Anabolic and catabolic pathways in eukaryotes are separated by either compartmentation or by the use of different enzymes and cofactors.
Major metabolic pathways
Main article: Cellular respiration
- Fatty acid oxidation (β-oxidation)
- HMG-CoA reductase pathway (cholesterol, isoprene prenylation chains)
- Pentose phosphate pathway (hexose monophosphate shunt)
- Porphyrin synthesis (or heme synthesis) pathway
- Urea cycle
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details