IUBMB Enzyme Nomenclature


Accepted name: trimethylamine-N-oxide reductase (cytochrome c)

Reaction: trimethylamine + 2 (ferricytochrome c)-subunit + H2O = trimethylamine N-oxide + 2 (ferrocytochrome c)-subunit + 2 H+

For diagram of reaction click here.

Other name(s): TMAO reductase; TOR

Systematic name: trimethylamine:cytochrome c oxidoreductase

Comments: The cytochrome c involved in photosynthetic bacteria is a pentaheme protein. Contains bis(molybdopterin guanine dinucleotide)molybdenum cofactor. The reductant is a membrane-bound multiheme cytochrome c. Also reduces dimethyl sulfoxide to dimethyl sulfide.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number: 37256-34-1


1. Arata, H., Shimizu, M. and Takamiya, K. Purification and properties of trimethylamine N-oxide reductase from aerobic photosynthetic bacterium Roseobacter denitrificans. J. Biochem. (Tokyo) 112 (1992) 470-475. [PMID: 1337081]

2. Knablein, J., Dobbek, H., Ehlert, S. and Schneider, F. Isolation, cloning, sequence analysis and X-ray structure of dimethyl sulfoxide trimethylamine N-oxide reductase from Rhodobacter capsulatus. Biol. Chem. 378 (1997) 293-302. [PMID: 9165084]

3. Czjzek, M., Dos Santos, J.P., Pommier, J., Giordano, G., Méjean, V. and Haser, R. Crystal structure of oxidized trimethylamine N-oxide reductase from Shewanella massilia at 2.5 Å resolution. J. Mol. Biol. 284 (1998) 435-447. [PMID: 9813128]

4. Gon, S., Giudici-Orticoni, M.T., Mejean, V. and Iobbi-Nivol, C. Electron transfer and binding of the c-type cytochrome TorC to the trimethylamine N-oxide reductase in Escherichia coli. J. Biol. Chem. 276 (2001) 11545-11551. [PMID: 11056172]

[EC created 2002]

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