EC |
1.13.11.11 |
Accepted name: |
tryptophan 2,3-dioxygenase |
Reaction: |
L-tryptophan + O2 = N-formyl-L-kynurenine |
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For diagram of tryptophan catabolism, click here |
Other name(s): |
tryptophan pyrrolase (ambiguous); tryptophanase; tryptophan oxygenase; tryptamine 2,3-dioxygenase; tryptophan peroxidase; indoleamine 2,3-dioxygenase (ambiguous); indolamine 2,3-dioxygenase (ambiguous); L-tryptophan pyrrolase; TDO; L-tryptophan 2,3-dioxygenase; L-tryptophan:oxygen 2,3-oxidoreductase (decyclizing) |
Systematic name: |
L-tryptophan:oxygen 2,3-oxidoreductase (ring-opening) |
Comments: |
A protohemoprotein. In mammals, the enzyme appears to be located only in the liver. This enzyme, together with EC 1.13.11.52, indoleamine 2,3-dioxygenase, catalyses the first and rate-limiting step in the kynurenine pathway, the major pathway of tryptophan metabolism [5]. The enzyme is specific for tryptophan as substrate, but is far more active with L-tryptophan than with D-tryptophan [2]. |
Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 9014-51-1 |
References: |
1. |
Uchida, K., Shimizu, T., Makino, R., Sakaguchi, K., Iizuka, T., Ishimura, Y., Nozawa, T. and Hatano, M. Magnetic and natural circular dichroism of L-tryptophan 2,3-dioxygenases and indoleamine 2,3-dioxygenase. I. Spectra of ferric and ferrous high spin forms. J. Biol. Chem. 258 (1983) 2519–2525. [PMID: 6600455] |
2. |
Ren, S., Liu, H., Licad, E. and Correia, M.A. Expression of rat liver tryptophan 2,3-dioxygenase in Escherichia coli: structural and functional characterization of the purified enzyme. Arch. Biochem. Biophys. 333 (1996) 96–102. [DOI] [PMID: 8806758] |
3. |
Leeds, J.M., Brown, P.J., McGeehan, G.M., Brown, F.K. and Wiseman, J.S. Isotope effects and alternative substrate reactivities for tryptophan
2,3-dioxygenase. J. Biol. Chem. 268 (1993) 17781–17786. [PMID: 8349662] |
4. |
Dang, Y., Dale, W.E. and Brown, O.R. Comparative effects of oxygen on indoleamine 2,3-dioxygenase and
tryptophan 2,3-dioxygenase of the kynurenine pathway. Free Radic. Biol. Med. 28 (2000) 615–624. [DOI] [PMID: 10719243] |
5. |
Littlejohn, T.K., Takikawa, O., Truscott, R.J. and Walker, M.J. Asp274 and His346 are essential for heme binding and catalytic function of human indoleamine 2,3-dioxygenase. J. Biol. Chem. 278 (2003) 29525–29531. [DOI] [PMID: 12766158] |
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[EC 1.13.11.11 created 1961 as EC 1.11.1.4, deleted 1964, reinstated 1965 as EC 1.13.1.12, transferred 1972 to EC 1.13.11.11, modified 1989, modified 2006] |
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