This view shows enzymes only for those organisms listed below, in the list of taxa known to possess the pathway. If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.
Synonyms: 2-(2-carboxy-4-methylthiazol-5-yl)ethyl phosphate biosynthesis
|Superclasses:||Biosynthesis → Cofactors, Prosthetic Groups, Electron Carriers Biosynthesis → Vitamins Biosynthesis → Thiamine Biosynthesis → Thiazole Biosynthesis|
Some taxa known to possess this pathway include : Bacillus subtilis subtilis 168
Expected Taxonomic Range:
Thiamin diphosphate, also known as vitamin B1, is known to play a fundamental role in energy metabolism. It is an essential cofactor for a variety of enzymes such as
pyruvate decarboxylase, and
[Lawhorn04a]. Its discovery followed from the original early research on the anti-beriberi factor found in rice bran. Beriberi, a neurological disease, was particularly prevalent in Asia, where the refining of rice resulted in the removal of the thiamin-containing husk
[Begley96]. Thiamin is synthesized de novo by microorganisms, plants and some lower eukaryotes (e.g.
Thiamin biosynthesis is composed of the separate formation of the pyrimidine and thiazole moieties, which are subsequently coupled to form thiamine phosphate (see thiamine diphosphate biosynthesis II (Bacillus)).
About This Pathway
This pathway describes only the synthesis of the thiazole moiety of thiamin. Different variations of this pathway exist, this particular pathway describes the pathway that occurs in Bacillus subtilis.
The process begins when the ThiF protein activates a ThiS sulfur-carrier protein by adenylation of its carboxy terminus, generating a carboxy-adenylated-[ThiS sulfur-carrier protein]. IscS, a protein that is also involved in the biosynthesis of iron-sulfur clusters, catalyzes the transfer of a sulfur atom from cysteine to the adenylated ThiS, generating a thiocarboxy-[ThiS-Protein].
The main reaction of this pathway is a very complex reaction catalyzed by thiazole synthase (ThiG), that requires three inputs: a thiocarboxy-[ThiS-Protein], 1-deoxy-D-xylulose 5-phosphate (DXP) and 2-iminoacetate. For many years the product of this reaction was assumed to be 5-(2-hydroxyethyl)-4-methylthiazole (thiazole). However, recent work performed with the thiazole synthase from Bacillus subtilis has shown that the actual product is the thiazole tautomer 2-[(2R,5Z)-2-carboxy-4-methylthiazol-5(2H)-ylidene]ethyl phosphate [Hazra09]. A dedicated thiazole tautomerase converts this product into a different tautomer, 2-(2-carboxy-4-methylthiazol-5-yl)ethyl phosphate, which is the actual substrate for the thiamine-phosphate diphosphorylase enzyme [Hazra11].
There are a few differences between the pathways in Bacillus subtilis (see thiazole biosynthesis I (facultative anaerobic bacteria)) and Escherichia coli K-12. 2-iminoacetate is formed from glycine rather than from L-tyrosine [Settembre03]. The ThiI protein of Bacillus does not seem to be essential or even participate in this pathway [Park03a], and thiazole tautomerase does not exist in Escherichia coli [Hazra11].
Superpathways: superpathway of thiamine diphosphate biosynthesis II
Hazra09: Hazra A, Chatterjee A, Begley TP (2009). "Biosynthesis of the thiamin thiazole in Bacillus subtilis: identification of the product of the thiazole synthase-catalyzed reaction." J Am Chem Soc 131(9);3225-9. PMID: 19216519
Hazra11: Hazra AB, Han Y, Chatterjee A, Zhang Y, Lai RY, Ealick SE, Begley TP (2011). "A missing enzyme in thiamin thiazole biosynthesis: identification of TenI as a thiazole tautomerase." J Am Chem Soc 133(24);9311-9. PMID: 21534620
Park03a: Park JH, Dorrestein PC, Zhai H, Kinsland C, McLafferty FW, Begley TP (2003). "Biosynthesis of the thiazole moiety of thiamin pyrophosphate (vitamin B1)." Biochemistry 42(42);12430-8. PMID: 14567704
Settembre03: Settembre EC, Dorrestein PC, Park JH, Augustine AM, Begley TP, Ealick SE (2003). "Structural and mechanistic studies on ThiO, a glycine oxidase essential for thiamin biosynthesis in Bacillus subtilis." Biochemistry 42(10);2971-81. PMID: 12627963
Begley99: Begley TP, Downs DM, Ealick SE, McLafferty FW, Van Loon AP, Taylor S, Campobasso N, Chiu HJ, Kinsland C, Reddick JJ, Xi J (1999). "Thiamin biosynthesis in prokaryotes." Arch Microbiol 1999;171(5);293-300. PMID: 10382260
Dorrestein04: Dorrestein PC, Zhai H, Taylor SV, McLafferty FW, Begley TP (2004). "The biosynthesis of the thiazole phosphate moiety of thiamin (vitamin B1): the early steps catalyzed by thiazole synthase." J Am Chem Soc 126(10);3091-6. PMID: 15012138
Dorrestein04a: Dorrestein PC, Zhai H, McLafferty FW, Begley TP (2004). "The biosynthesis of the thiazole phosphate moiety of thiamin: the sulfur transfer mediated by the sulfur carrier protein ThiS." Chem Biol 11(10);1373-81. PMID: 15489164
Estevez00: Estevez JM, Cantero A, Romero C, Kawaide H, Jimenez LF, Kuzuyama T, Seto H, Kamiya Y, Leon P (2000). "Analysis of the expression of CLA1, a gene that encodes the 1-deoxyxylulose 5-phosphate synthase of the 2-C-methyl-D-erythritol-4-phosphate pathway in Arabidopsis." Plant Physiol 124(1);95-104. PMID: 10982425
Flint96a: Flint DH (1996). "Escherichia coli contains a protein that is homologous in function and N-terminal sequence to the protein encoded by the nifS gene of Azotobacter vinelandii and that can participate in the synthesis of the Fe-S cluster of dihydroxy-acid dehydratase." J Biol Chem 1996;271(27);16068-74. PMID: 8663056
Herz00: Herz S, Wungsintaweekul J, Schuhr CA, Hecht S, Luttgen H, Sagner S, Fellermeier M, Eisenreich W, Zenk MH, Bacher A, Rohdich F (2000). "Biosynthesis of terpenoids: YgbB protein converts 4-diphosphocytidyl-2C-methyl-D-erythritol 2-phosphate to 2C-methyl-D-erythritol 2,4-cyclodiphosphate." Proc Natl Acad Sci U S A 2000;97(6);2486-90. PMID: 10694574
Julsing07: Julsing MK, Rijpkema M, Woerdenbag HJ, Quax WJ, Kayser O (2007). "Functional analysis of genes involved in the biosynthesis of isoprene in Bacillus subtilis." Appl Microbiol Biotechnol 75(6);1377-84. PMID: 17458547
Kriek07: Kriek M, Martins F, Leonardi R, Fairhurst SA, Lowe DJ, Roach PL (2007). "Thiazole synthase from Escherichia coli: an investigation of the substrates and purified proteins required for activity in vitro." J Biol Chem 282(24);17413-23. PMID: 17403671
Kuzuyama00: Kuzuyama T, Takagi M, Takahashi S, Seto H (2000). "Cloning and characterization of 1-deoxy-D-xylulose 5-phosphate synthase from Streptomyces sp. Strain CL190, which uses both the mevalonate and nonmevalonate pathways for isopentenyl diphosphate biosynthesis." J Bacteriol 182(4);891-7. PMID: 10648511
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