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isomerase i·som·er·ase (ī-sŏm'ə-rās')
One of a group of enzymes that catalyzes the conversion of one isomer into another.
any one of a class of enzymes that catalyze reactions involving a structural rearrangement of a molecule. Alanine racemase, for example, catalyzes the conversion of L-alanine into its isomeric (mirror-image) form, D-alanine. An isomerase called mutarotase catalyzes the conversion of alpha-d-glucose into beta-d-glucose. cf. ligase, lyase.