An organic molecule or ion (usually a metal ion) that is required by an enzyme for its activity. It may be attached either loosely (coenzyme) or tightly (prosthetic group).
4-methylideneimidazole-5-one cofactor
(CHEBI:50997)
is a
polypeptide-derived cofactor
(CHEBI:36079)
L-topaquinone residue
(CHEBI:46045)
is a
polypeptide-derived cofactor
(CHEBI:36079)