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Any of several forms of an enzyme that catalyze the same reaction but differ in chemical structure. Also called isozyme.

i′so·en·zy′mic adj.


(Biochemistry) another name for isozyme
isoenzymic, isoenzymatic adj


(ˈaɪ səˌzaɪm)

a variant form of certain enzymes that catalyzes the same reaction as other forms. Also called isoenzyme.
[1959; iso- + (en) zyme]
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References in periodicals archive ?
Current projects are focusing on the two isoenzymes of Glutaminyl cyclase, QPCT and QPCTL.
Lactic dehydrogenase isoenzymes in human cancer cells and malignant effusions.
Alkaline phosphatase (ALP) is a zinc-containing glycoprotein consisting of four isoenzymes, which are produced mainly in the bone, liver, intestines, and placenta.
There was a proposed mechanism: PPIs competitively inhibit cytochrome P450 isoenzymes, which blocked clopidogrel activation and, ex vivo, increased platelet aggregation.
Wasilewska, "Pediatric reference data on activity of urinary N-acetyl-[beta]-D-hexosaminidase and its isoenzymes," Advances in Medical Sciences, vol.
Four maize hybrids and their parental lines were used to find genetic purity through testing with four isoenzymes such as alcohol dehydrogenase (ADH), esterase (EST), acid phosphatase (ACP) and malate dehydrogenase (MDH) and evaluated with thirty pairs of simple sequence repeat (SSR) markers.
The synthesis of PAPS (3-phosphoadenosine 5-phosphosulfate) -a sulfate donor - is catalyzed by two isoenzymes (PAPS synthase1 and PAPS synthase 2).
Clinical studies with different garlic preparations--dried powder, aqueous extracts, deodorized preparations, oils--have demonstrated diverse and highly variable results in tests of effects on CYP isoenzymes and other metabolism activities.
Esterase isoenzymes were analyzed using vertical thin-layer native polyacrylamide gel electrophoresis (PAGE) equipment (DYG-28A electrophoresis cell, DYY-10C electrophoresis power supply; Beijing Liuyi Instrument Factory, Beijing, China), with a 7.5% slab gel and a 4.0% stacking gel.