Phosphomethylpyrimidine synthase

Phosphomethylpyrimidine synthase (EC 4.1.99.17, thiC (gene)) is an enzyme with systematic name 5-amino-1-(5-phospho-D-ribosyl)imidazole formate-lyase (decarboxylating, 4-amino-2-methyl-5-phosphomethylpyrimidine-forming).^[1]^[2]^[3] This enzyme catalyses the following chemical reaction

5-amino-1-(5-phospho-D-ribosyl)imidazole + S-adenosyl-L-methionine

\rightleftharpoons

4-amino-2-methyl-5-phosphomethylpyrimidine + 5'-deoxyadenosine + L-methionine + formate + CO

This enzyme binds a 4Fe-4S cluster.

References

↑ Chatterjee, A.; Li, Y.; Zhang, Y.; Grove, T.L.; Lee, M.; Krebs, C.; Booker, S.J.; Begley, T.P.; Ealick, S.E. (2008). "Reconstitution of ThiC in thiamine pyrimidine biosynthesis expands the radical SAM superfamily". Nat. Chem. Biol. 4: 758–765. doi:10.1038/nchembio.121. PMC 2587053. PMID 18953358.
↑ Martinez-Gomez, N.C.; Poyner, R.R.; Mansoorabadi, S.O.; Reed, G.H.; Downs, D.M. (2009). "Reaction of AdoMet with ThiC generates a backbone free radical". Biochemistry. 48 (2): 217–219. doi:10.1021/bi802154j. PMID 19113839.
↑ Chatterjee, A.; Hazra, A.B.; Abdelwahed, S.; Hilmey, D.G.; Begley, T.P. (2010). "A "radical dance" in thiamin biosynthesis: mechanistic analysis of the bacterial hydroxymethylpyrimidine phosphate synthase". Angew. Chem. Int. Ed. Engl. 49 (46): 8653–8656. doi:10.1002/anie.201003419. PMID 20886485.

External links

Phosphomethylpyrimidine synthase at the US National Library of Medicine Medical Subject Headings (MeSH)

Carbon-carbon lyases (EC 4.1)

4.1.1: Carboxy-lyases	Acetoacetate decarboxylase Adenosylmethionine decarboxylase Aromatic L-amino acid decarboxylase Glutamate decarboxylase Histidine decarboxylase Lysine decarboxylase Malonyl-CoA decarboxylase Ornithine decarboxylase Oxaloacetate decarboxylase Phosphoenolpyruvate carboxykinase Phosphoenolpyruvate carboxylase Phosphoribosylaminoimidazole carboxylase Pyrophosphomevalonate decarboxylase Pyruvate decarboxylase RuBisCO Uridine monophosphate synthetase/Orotidine 5'-phosphate decarboxylase Uroporphyrinogen III decarboxylase

4.1.2: Aldehyde-lyases	Fructose-bisphosphate aldolase Aldolase A Aldolase B Aldolase C 2-hydroxyphytanoyl-CoA lyase Threonine aldolase

4.1.3: Oxo-acid-lyases	Isocitrate lyase 3-hydroxy-3-methylglutaryl-CoA lyase

4.1.99: Other	Tryptophanase

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list)

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