IUBMB Enzyme Nomenclature


Accepted name: thiazole synthase

Reaction: 1-deoxy-D-xylulose 5-phosphate + 2-iminoacetate + thiocarboxy-[sulfur-carrier protein ThiS] = 2-[(2R,5Z)-2-carboxy-4-methylthiazol-5(2H)-ylidene]ethyl phosphate + [sulfur-carrier protein ThiS] + 2 H2O

For diagram of reaction click here.

Glossary: cThz*-P = 2-[(2R,5Z)-2-carboxy-4-methylthiazol-5(2H)-ylidene]ethyl phosphate

Other name(s): thiG (gene name)

Systematic name: 1-deoxy-D-xylulose 5-phosphate:thiol sulfurtransferase

Comments: H2S can provide the sulfur in vitro. Part of the pathway for thiamine biosynthesis.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number:


1. Park, J.H., Dorrestein, P.C., Zhai, H., Kinsland, C., McLafferty, F.W. and Begley, T.P. Biosynthesis of the thiazole moiety of thiamin pyrophosphate (vitamin B1). Biochemistry 42 (2003) 12430-12438. [PMID: 14567704]

2. Dorrestein, P.C., Zhai, H., McLafferty, F.W. and Begley, T.P. The biosynthesis of the thiazole phosphate moiety of thiamin: the sulfur transfer mediated by the sulfur carrier protein ThiS. Chem. Biol. 11 (2004) 1373-1381. [PMID: 15489164]

3. Dorrestein, P.C., Zhai, H., Taylor, S.V., McLafferty, F.W. and Begley, T.P. The biosynthesis of the thiazole phosphate moiety of thiamin (vitamin B1): the early steps catalyzed by thiazole synthase. J. Am. Chem. Soc. 126 (2004) 3091-3096. [PMID: 15012138]

4. Settembre, E.C., Dorrestein, P.C., Zhai, H., Chatterjee, A., McLafferty, F.W., Begley, T.P. and Ealick, S.E. Thiamin biosynthesis in Bacillus subtilis: structure of the thiazole synthase/sulfur carrier protein complex. Biochemistry 43 (2004) 11647-11657. [PMID: 15362849]

5. Hazra, A., Chatterjee, A. and Begley, T.P. Biosynthesis of the thiamin thiazole in Bacillus subtilis: identification of the product of the thiazole synthase-catalyzed reaction. J. Am. Chem. Soc. 131 (2009) 3225-3229. [PMID: 19216519]

6. Hazra, A.B., Han, Y., Chatterjee, A., Zhang, Y., Lai, R.Y., Ealick, S.E. and Begley, T.P. A missing enzyme in thiamin thiazole biosynthesis: identification of TenI as a thiazole tautomerase. J. Am. Chem. Soc. 133 (2011) 9311-9319. [PMID: 21534620]

[EC created 2011, modified 2016]

Return to EC 2.8.1 home page
Return to EC 2.8 home page
Return to EC 2 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page