Prenylation

Part of speech: noun

Definitions

1. A biochemical process involving the attachment of lipid groups to a protein to facilitate its anchoring to cell membranes; specifically, the addition of hydrophobic molecules like farnesyl or geranylgeranyl groups to cysteine residues
2. A cellular modification whereby lipid moieties are covalently linked to proteins, enhancing their membrane association and influencing their function; commonly involves the transfer of prenyl groups such as farnesyl or geranylgeranyl to target proteins
3. The enzymatic coupling of isoprenoid lipids to specific proteins, enabling their membrane localization and participation in intracellular signaling; including attachment of farnesyl or geranylgeranyl groups to designated amino acids in proteins

Etymology: Prenylation is a fairly modern coinage built from the word "prenyl," which chemists formed from "prenyl" the isoprenoid radical name, itself derived from "isoprene," the five-carbon hydrocarbon that makes up the building blocks of natural rubber and many plant terpenes. The "-yl" ending marks a chemical radical, and "-ation" turns the process into a noun, so the term names the act of attaching a prenyl-type group onto something else. In cells, the enzymes that do this recognise specific short sequences near the ends of proteins and graft on a farnesyl or geranylgeranyl unit, a hydrophobic tail that anchors the protein into membranes. Without that anchor, many signalling proteins, including members of the Ras family, could not reach the inner surface of the cell membrane where they relay their messages.

Synonyms: lipidation