1) Enzyme 
Isomerases are a general class of enzymes which convert a molecule from one isomer to another. Isomerases can either facilitate intramolecular rearrangements in which bonds are broken and formed or they can catalyze conformational changes. The general form of such a reaction is as follows: A–B → B–A There is only one substrate yielding one p...
any one of a class of enzymes that catalyze reactions involving a structural rearrangement of a molecule. Alanine racemase, for example, catalyzes ... [2 related articles]
<enzyme> An enzyme that converts molecules into their positional isomers. ... (09 Oct 1997) ... 
(i-som´әr-ās) a major class of enzymes comprising those that catalyze the process of isomerization, such as the interconversion of aldoses and ketoses.
Type: Term Pronunciation: ī-som′ĕr-ās Definitions: 1. A class of enzymes catalyzing the conversion of a substance to an isomeric form, glucosephosphate isomerase.
[n] - an enzyme that catalyzes its substrate to an isomeric form
any of a class of enzymes that catalyze reactions involving intramolecular rearrangements.