Defucosyl

Part of speech: adjective

Definitions

1. Having had a fucose sugar residue removed from a glycan or glycoprotein chain
2. Describing a sugar molecule or glycoconjugate that has lost its attached fucose unit through enzymatic or chemical cleavage
3. Stripped of fucose, a deoxyhexose sugar, from a carbohydrate structure such as an antibody's glycan

Etymology: "Fucose" is named after "Fucus," the genus of brown seaweeds, whose name comes from Latin "fucus," meaning seaweed, and ultimately from Greek "phykos." The sugar was identified in seaweed, so chemists named it for its source. The suffix "-yl" is the standard chemical marker for a radical, a group of atoms that moves as a unit between molecules, which yields "fucosyl" for the fucose unit when it is attached to another molecule. The prefix "de-" comes from Latin and means "removal" or "down from," so "defucosyl" describes a molecule from which a fucosyl group has been removed, usually by cleaving the bond that held it in place. Biochemistry uses this kind of transparent construction to name modified molecules, so the term is a compound of established parts rather than one with a separate origin story.