isomerases

Enzymes that catalyse intramolecular rearrangements. Isomerases are classified into racemases and epimerases, cis-trans isomerases, intramolecularlyases and other isomerases.
Source:
PAC, 1992, 64, 143 (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 158