In biochemistry, isomerases are a general class of enzymes that convert a molecule from one isomer to another. Isomerases facilitate intramolecular rearrangements in which bonds are broken and formed. The general form of such a reaction is as follows:
![{\displaystyle {\ce {A-B}}\quad {\xrightarrow[{\text{ isomerase }}]{}}\quad {\ce {B-A}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/3e7114e4d3961ea355ca13869f9ea72fc1b38e08)
There is only one substrate yielding one product. This product has the same molecular formula as the substrate but differs in bond connectivity or spatial arrangement. Isomerases catalyze reactions across many biological processes, such as in glycolysis and carbohydrate metabolism.