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How is squalene connected to the production of cholesterol?
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Isoprenoid
Camphor, an isoprenoid compound classified as a terpenoid ketone, is used in incense and certain medicinal compounds. It is a natural substance obtained from the camphor laurel (Cinnamomum camphora), a species of evergreen.
Squalene serves as a vital metabolic intermediate and a direct precursor in the biosynthesis of cholesterol.12
The production process follows these key stages:
- Formation of Squalene: The pathway begins with the conversion of acetate units into mevalonic acid, which is eventually transformed into isopentenyl pyrophosphate. Six molecules of this five-carbon unit condense to form the 30-carbon linear hydrocarbon, squalene.32
- Cyclization: To become cholesterol, the linear squalene molecule undergoes oxidation to form squalene 2,3-oxide. Through a complex, enzyme-controlled process of cyclization and structural rearrangement, this molecule is converted into lanosterol.2
- Final Conversion: Lanosterol undergoes further structural modifications to yield the final 27-carbon cholesterol molecule.32
Although cholesterol itself is not a terpene, the discovery that it originates from a terpene precursor like squalene was a significant milestone in understanding the biochemical relationship between these two classes of compounds.1