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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 ?
Role of creatine kinase isoenzymes on muscular and cardiorespiratory endurance.
Some of the cardiac biomarkers include creatine kinase (CK) MB, troponins (cTnI and cTnT), BNP, NT-proBNP, GFAP, H-FABP, LDH isoenzymes, D-dimer, IMA, MPO, myoglobin, and sCD40L.
There are multiple laccase genes, which is esponsible for the biochemical diversity of laccase isoenzymes [14].
Superoxide dismutase isoenzymes and possibly other peroxidases also appear to be involved in the responses observed.
The Q isoenzyme has a greater hydrolytic efficiency for, and more rapidly inactivates, OP chemical warfare nerve agents such as sarin and soman, whereas the R isoenzyme has greater hydrolytic efficiency for, and thus more rapidly inactivates, certain OP pesticides, such as paraoxon and chlorpyrifosoxon; both isoenzymes hydrolyze phenylacetate with similar efficiency (11, 12).
Vitkup's team also found hundreds of differences between normal and cancer cells' use of isoenzymes.
The serum contains in variable proportions five LD isoenzymes, formed from monomeric polypeptides B and A.
LDH isoenzymes are present in many body tissues such as brain, kidney, liver, lung, myocardium, spleen, erythrocytes, leucocytes and platelets (5).
The in vitro induction potential of the extracts was tested in freshly isolated human hepatocytes from 3 donors as influence on the catalytic activity of five cytochrome P450 isoenzymes, namely 1A2, 2B6, 2C9, 2E1, and 3A4 on the respective marker substrates.
His current research interests include Protein-Energy Malnutrition and malaria in children, Aflatoxin and Fumonisin contamination as factors in growth retardation, HIV-AIDS and malnutrition in children, Isoenzymes as tools in disease diagnosis and the role of vitamins A and E in disease diagnosis.
For example, lactate dehydrogenase and LD isoenzymes are discussed as cardiac markers.
Purification of GDH isoenzymes: GDH isoenzymes were extracted from 10 g of the harvested control or treated peanut seeds by homogenizing with ice-cold extraction buffer [20] containing RNase A and DNase 1; and purified by [(N[H.