What does fucose mean?
Fucose is a naturally occurring monosaccharide known chemically as 6-deoxygalactose — a six-carbon sugar distinguished by lacking one hydroxyl group compared with galactose. Unlike familiar sugars such as glucose or fructose, fucose is not eaten as a sweetener; instead, it occurs bonded onto larger molecules, appearing at the tips of glycan chains on glycoproteins and glycolipids throughout the body. In that position it carries remarkable biological weight: fucose residues help define the ABO blood group antigens, guide cell-to-cell recognition, and influence inflammatory responses, while abnormal fucose attachment has been implicated in cancer and other diseases. The term belongs almost entirely to the vocabulary of biochemists and glycobiologists, appearing in research papers discussing fucose residues, fucosylation, and fucose-processing enzymes. Its very name recalls its origin — it was first isolated from brown seaweed, genus Fucus — making this small sugar an unusual bridge between marine biology and human medicine.
nounFucose is a naturally occurring monosaccharide — a six-carbon deoxy sugar (6-deoxygalactose) — found attached to the surface of cells, where it forms part of glycans such as those that determine human blood group antigens.
- The monosaccharide 6-deoxygalactose, especially when found as a component of glycoproteins, glycolipids, and other complex carbohydrates on cell surfaces.
"The addition of a terminal fucose molecule can dramatically alter how a glycoprotein interacts with the immune system."
"Researchers measured fucose levels on the antibody's glycan chains to assess its anti-inflammatory activity."
"Brown algae are a rich natural source of fucose-containing polysaccharides."
Fucose refers to a substance rather than countable objects, so it functions as a mass noun; a plural form is not conventionally used.
"The glycoprotein carried several chains, each capped with fucose."
This obscure sugar was first isolated from brown seaweed — yet it now sits on the surface of your own cells, helping determine your blood type.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fucose
The word fucose traces its origin to Greek phykos, meaning seaweed, which Latin adopted as fucus, the genus name for brown algae. When chemists first isolated the sugar from fucoidin extracted from these seaweeds in the nineteenth century, they named it after its source, giving us 'fucose'. Related terms such as phycology (the study of algae) descend from the same Greek root, keeping the seaweed connection embedded in modern science.
Related word forms
How fucose is actually used
Strictly a technical term in biochemistry, glycobiology, and medicine; fucose is essentially never encountered outside scientific literature. It is treated as a mass quantity rather than counted, so no plural is used.
Easily confused with fucose
Fructose is fruit sugar, a common dietary ketohexose, whereas fucose is a rare deoxy sugar mainly attached to cell-surface molecules rather than used as food.