thioester(redirected from Thionoester)
In enzymology, an ester where the oxygen bridging the substrate or product carbonyl carbon and the enzyme is replaced by a sulfur (usually through a Cys residue); a high-energy intermediate in many enzymes.
thioester/thio·es·ter/ (-es´ter) a carboxylic acid and a thiol group in ester linkage, e.g., acetyl coenzyme A.
an important group of biological chemicals formed by the hydrosulfides (or mercaptans or thiols) and carboxylic acids and identified by a bond between the acyl carbonyl carbon and the thiol sulfur. Examples include the coenzyme A thioesters.