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In biochemistry, an isomerase is any enzyme that catalyses the interconversion of isomers. Isomerases thus catalyze reactions of the form

A → B

Contents 1 Nomenclature 2 Classification 3 See also 4 References

[edit] Nomenclature

The names of isomerases are formed as "substrate isomerase" (for example, enoyl CoA isomerase), or as "substrate type of isomerase" (for example, phosphoglucomutase).

[edit] Classification

Isomerases are classified as EC 5 in the EC number classification of enzymes. Isomerases can be further classified into six subclasses:

• EC 5.1 includes enzymes that catalyze racemization (racemases) and epimerization (epimerases)
• EC 5.2 includes enzymes that catalyze the isomerization of geometric isomers (cis-trans isomerases)
• EC 5.3 includes intramolecular oxidoreductases
• EC 5.4 includes intramolecular transferases (mutases)
• EC 5.5 includes intramolecular lyases
• EC 5.99 includes other isomerases

[edit] See also

• Hydrolase
• Ligase
• Lyase
• Oxidoreductase
• Transferase

[edit] References

• EC 5 Introduction from the Department of Chemistry at Queen Mary University of Londonbg:Изомераза

cs:Izomeráza de:Isomerasen fr:Isomérase it:Isomerasi pl:Izomeraza pt:Isomerase zh:異構酶