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search Ribbon diagram of Glucose-6-Phosphate isomerase
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 product. This product
has the same molecular formula as the substrate but differs in
bond connectivity or spatial arrangements. Isomerases catalyze
reactions across many biological processes, such as in
glycolysis and carbohydrate metabolism.   Examples of isomers
zig-zag models of hexane and four isomers The structural isomers
of hexane zig-zag model of cis-2-butene vs trans-2-butene
Cis-2-butene and Trans-2-butene projection of D-glucose and
D-mannose Epimers: D-glucose and D-mannose  Isomerases catalyze
changes within one molecule.[1] They convert one iso