In biochemistry, an isomerase is an enzyme that catalyzes the structural rearrangement of isomers. Isomerases thus catalyze reactions of the form
- A → B
where B is an isomer of A.
The names of isomerases are formed as "substrate isomerase" (for example, enoyl CoA isomerase), or as "substrate type of isomerase" (for example, phosphoglucomutase).
Isomerases have their own EC classification of enzymes: EC 5. Isomerases can be further classified into six subclasses:
- EC 5 Introduction from the Department of Chemistry at Queen Mary, University of London
- isomerase." Dorland's Medical Dictionary for Health Consumers. 2007. Saunders, an imprint of Elsevier, Inc 6 Nov. 2009 
- isomerase." Webster's New World College Dictionary. LoveToKnow, n.d. Web. 6 November 2009. 
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