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Pathway Description
Pterine Biosynthesis
Homo sapiens
Category:
Metabolite Pathway
Sub-Category:
Metabolic
Created: 2013-08-16
Last Updated: 2023-10-12
Folates are very important cofactors that provide support for many biosynthetic reactions. The reactions depicted in this pathway include reactions that are paired with transports, within the cell, travelling intracellularly, which allows folate to be absorbed by cells, as well as the synthesis of pterines, which are used in folate synthesis. Two branches are depicted: Pterin synthesis and Folate biosynthesis. In pterin synthesis, GTP is the precursor for pterin biosynthesis. In the first reaction, GTP cyclohydrolase acts to create formamidopyrimidine nucleoside triphosphate from guanosine triphosphate, which is provided from the purine metabolism pathway. Formamidopyrimidine nucleoside triphosphate then uses GTP cyclohydrolase again to create 2,5-diaminopyrimidine nucleoside triphosphate. GTP cyclohydrolase then works with 2,5-diaminopyrimidine nucleoside triphosphate to produce 2,3-diamino-6-(5’-triphosphoryl-3’,4’-trihydroxy-2’-oxopentyl)-amino-4-oxopyrimidine, which is then converted by GTP cyclohydrolase to dihydroneopterin triphosphate. Dihydroneopterin is then transported to the mitochondria and subsequently catalyzed into dyspropterin, which then exits the mitochondria to continue pterin biosynthesis. Once having been transported from the mitochondria, dyspropterin uses sepiapterin reductase, aldose reductase and carbonyl reductase [NADPH] 1 to create 6-lactoyltetrahydropterin. This compound then undergoes 2 reactions, the first being sepiapterin reductase converting 6-lactoyltetrahydropterin into tetrahydrobiopterin, the second being 6-lactoyltetrahydropterin being converted to sepiapterin. Both branches of pterin reactions then respectively end in the creation of neopterin and dihydrobiopterin.
References
Pterine Biosynthesis References
Lehninger, A.L. Lehninger principles of biochemistry (4th ed.) (2005). New York: W.H Freeman.
Salway, J.G. Metabolism at a glance (3rd ed.) (2004). Alden, Mass.: Blackwell Pub.
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Crabtree MJ, Channon KM: Synthesis and recycling of tetrahydrobiopterin in endothelial function and vascular disease. Nitric Oxide. 2011 Aug 1;25(2):81-8. doi: 10.1016/j.niox.2011.04.004. Epub 2011 Apr 22.
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Pubmed: 15489334
Thony B, Leimbacher W, Burgisser D, Heizmann CW: Human 6-pyruvoyltetrahydropterin synthase: cDNA cloning and heterologous expression of the recombinant enzyme. Biochem Biophys Res Commun. 1992 Dec 30;189(3):1437-43. doi: 10.1016/0006-291x(92)90235-d.
Pubmed: 1282802
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Pubmed: 8216273
Ashida A, Owada M, Hatakeyama K: A missense mutation (A to G) of 6-pyruvoyltetrahydropterin synthase in tetrahydrobiopterin-deficient form of hyperphenylalaninemia. Genomics. 1994 Nov 15;24(2):408-10. doi: 10.1006/geno.1994.1642.
Pubmed: 7698774
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