In enzymology, a tryptophanase (EC 184.108.40.206) is an enzyme that catalyzes the chemical reaction
- L-tryptophan + H2O indole + pyruvate + NH3
Thus, the two substrates of this enzyme are L-tryptophan and H2O, whereas its 3 products are indole, pyruvate, and NH3.
This enzyme belongs to the family of lyases, specifically in the "catch-all" class of carbon-carbon lyases. The systematic name of this enzyme class is L-tryptophan indole-lyase (deaminating; pyruvate-forming). Other names in common use include L-tryptophanase, and L-tryptophan indole-lyase (deaminating). This enzyme participates in tryptophan metabolism and nitrogen metabolism. It has 2 cofactors: pyridoxal phosphate, and Potassium.
As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes 1AX4, 2C44, and 2OQX.
- BURNS RO, DEMOSS RD (1962). "Properties of tryptophanase from Escherichia coli". Biochim. Biophys. Acta. 65 (2): 233–44. doi:10.1016/0006-3002(62)91042-9. PMID 14017164.
- Cowell JL, Maser K, DeMoss, RD (1973). "Tryptophanase from Aeromonas liquifaciens. Purification, molecular weight and some chemical, catalytic and immunological properties". Biochim. Biophys. Acta. 315: 449–463. doi:10.1016/0005-2744(73)90276-3.
- NEWTON WA, MORINO Y, SNELL EE (1965). "PROPERTIES OF CRYSTALLINE TRYPTOPHANASE". J. Biol. Chem. 240: 1211–8. PMID 14284727.