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Encyclopedia > Sterol

Sterols, or steroid alcohols are a subgroup of steroids with a hydroxyl group in the 3-position of the A-ring. They are amphipathic lipids synthetised from acetyl-coenzyme A. The overall molecule is quite flat. The hydroxyl group on the A ring is polar. The rest of the aliphatic chain is non-polar. Image File history File links Sterol_skeleton. ... This article is about the chemical family of steroids. ... Hydroxide is a functional group consisting of oxygen and hydrogen: -O−H It has a charge of 1-. The term hydroxyl group is used when the functional group -OH is counted as a substituent of an organic compound. ... Amphipathic lipids are lipids that are hydrophilic on one end, and hydrophobic on the other. ... Acetyl-CoA is an important molecule in metabolism, used in many biochemical reactions. ... A commonly-used example of a polar compound is water (H2O). ... In chemistry, non-aromatic and non-cyclic (acyclic) organic compounds are called aliphatic. ... A commonly-used example of a polar compound is water (H2O). ...


Sterols of plants are called phytosterols and sterols of animals are called zoosterols. The most important zoosterols are cholesterol and some steroid hormones; the most important phytosterols are campesterol, sitosterol, and stigmasterol. For other uses, see Plant (disambiguation). ... β-sitosterol Ergosterol. ... For other uses, see Animal (disambiguation). ... Cholesterol is a sterol (a combination steroid and alcohol), a lipid found in the cell membranes of all body tissues, and is transported in the blood plasma of all animals. ... Steroid hormones are steroids which act as hormones. ... β-sitosterol Phytosterols (also called plant sterols) are a group of steroid alcohol, phytochemicals naturally occurring in plants. ... β-sitosterol Phytosterols (also called plant sterols) are a group of steroid alcohol, phytochemicals naturally occurring in plants. ... β-sitosterol Phytosterols (also called plant sterols) are a group of steroid alcohol, phytochemicals naturally occuring in plants. ...


Sterols play essential roles in the physiology of eukaryotic organisms. For example cholesterol forms part of the cellular membrane where its presence decreases the cell membrane's fluidity and serves as secondary messenger in developmental signaling. Kingdoms Animalia - Animals Fungi Plantae - Plants Chromalveolata Protista Alternative phylogeny Unikonta Opisthokonta Metazoa Choanozoa Eumycota Amoebozoa Bikonta Apusozoa Cabozoa Rhizaria Excavata Corticata Archaeplastida Chromalveolata Animals, plants, fungi, and protists are eukaryotes (IPA: ), organisms whose cells are organized into complex structures by internal membranes and a cytoskeleton. ... Drawing of a cell membrane A component of every biological cell, the selectively permeable cell membrane (or plasma membrane or plasmalemma) is a thin and structured bilayer of phospholipid and protein molecules that envelopes the cell. ... A Second messenger system is a method of cellular signaling where the signalling molecule does not enter the cell, but rather utilizes a cascade of events that transduces the signal into a cellular change. ...


Plant sterols are also known to block cholesterol absorption sites in the human intestine thus helping to reduce cholesterol in humans.


In humans sterols act to provide important signals and metabolic communications eg. circadian rhythms, blood clotting.


See also

Cholesterol is a sterol (a combination steroid and alcohol), a lipid found in the cell membranes of all body tissues, and is transported in the blood plasma of all animals. ... β-sitosterol Ergosterol. ... Ergosterol (ergosta-5,7,22-trien-3β-ol), a sterol, is the biological precursor to Vitamin D2. ...

References

Molecular Biology of the Cell (Alberts et al., 2002) [1]


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