coenzyme 

https://doi.org/10.1351/goldbook.C01126
The dissociable, low-relative-molecular-mass active group of an enzyme which transfers chemical groups, hydrogen or electrons. A coenzyme binds with its associated protein (apoenzyme) to form the active enzyme (holoenzyme).
Source:
PAC, 1994, 66, 2587. (Glossary of bioanalytical nomenclature - Part 1: General terminology, body fluids, enzymology, immunology (IUPAC Recommendations 1994)) on page 2593 [Terms] [Paper]
See also:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 150 [Terms] [Paper]
Citation: 'coenzyme' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.C01126 RIS BibTex EndNote
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Last revised: October 7, 2008