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In enzymology, a L-dopachrome isomerase (EC 5.3.3.12) is an enzyme that catalyzes the chemical reaction

L-dopachrome ${\displaystyle \rightleftharpoons }$ 5,6-dihydroxyindole-2-carboxylate

Hence, this enzyme has one substrate, L-dopachrome, and one product, 5,6-dihydroxyindole-2-carboxylate.

This enzyme belongs to the family of isomerases, specifically those intramolecular oxidoreductases transposing C=C bonds. The systematic name of this enzyme class is L-dopachrome keto-enol isomerase. Other names in common use include dopachrome tautomerase, tyrosinase-related protein 2, TRP-1, TRP2, TRP-2, tyrosinase-related protein-2, dopachrome Delta7,Delta2-isomerase, dopachrome Delta-isomerase, dopachrome conversion factor, dopachrome isomerase, dopachrome oxidoreductase, dopachrome-rearranging enzyme, DCF, DCT, dopachrome keto-enol isomerase, and L-dopachrome-methyl ester tautomerase. This enzyme participates in tyrosine metabolism and melanogenesis.

References

• Jara JR, Lozano JA (January 15, 1996). "Molecular mechanism for catalysis by a new zinc-enzyme, dopachrome tautomerase". Biochem. J. 313 (2): 447–53. PMC 1216928. PMID 8573077.
• Pawelek JM (1990). "Dopachrome conversion factor functions as an isomerase". Biochem. Biophys. Res. Commun. 166 (3): 1328–33. doi:10.1016/0006-291X(90)91011-G. PMID 2106316.
• Joshua GW, Selkirk ME, Zhang Y, Meyer DJ (November 1, 1998). "Rapid purification and characterization of L-dopachrome-methyl ester tautomerase (macrophage-migration-inhibitory factor) from Trichinella spiralis, Trichuris muris and Brugia pahangi". Biochem. J. 335 (3): 495–8. PMC 1219807. PMID 9794786.

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