sterol
Definition
Noun: 1. A type of organic compound: A sterol is any of a large group of naturally occurring, complex organic compounds. They are a specific subclass of steroids characterized by having a hydroxyl (-OH) group attached at the carbon-3 position of the steroid core structure. 2. Chemical and physical properties: Sterols are waxy, fat-like substances that are insoluble in water but soluble in organic solvents. They are essential components of cell membranes in most eukaryotic organisms (plants, animals, fungi).
Examples of Usage
- General Reference:
- Cholesterol is the most well-known sterol in animal cells.
- Phytosterols are a type of sterol found in plants.
- Scientific Context:
- The function of this sterol is to modulate membrane fluidity.
- Researchers are studying the biosynthesis of sterols in fungi.
Advanced Usage
- "Sterol regulatory element": A specific DNA sequence that controls genes involved in sterol synthesis and uptake.
- The gene's expression is controlled by a sterol regulatory element.
- "Sterol ester": A compound formed when a sterol is linked to a fatty acid, often used for storage or transport.
- Most cholesterol in the blood is transported as a sterol ester within lipoprotein particles.
Variants and Related Words
- Steroid (noun): The broader parent class of organic compounds with a specific four-ring carbon structure. All sterols are steroids, but not all steroids are sterols (e.g., testosterone is a steroid but not a sterol).
- Steroidal (adjective): Relating to or characteristic of steroids.
- The molecule has a steroidal backbone.
- Cholesterol (noun): The principal zoosterol (animal sterol), crucial for membrane structure and a precursor for other steroids.
- Phytosterol (noun): A sterol produced by plants (e.g., sitosterol, campesterol).
- Ergosterol (noun): A sterol found in fungal cell membranes, targeted by some antifungal medications.
Synonyms
- Steroid alcohol (technical synonym)
- Lipid (broader category; sterols are a type of lipid)
Related Phrases / Compound Terms
- Sterol biosynthesis: The metabolic pathway by which organisms produce sterols.
- Sterol content: A measurement of the amount of sterol present in a substance, such as food or a biological sample.
- Membrane sterol: A sterol that is integrated into a cellular membrane to regulate its properties.
Noun
-
any of a group of natural steroid alcohols derived from plants or animals; they are waxy insoluble substances
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