Isoleucine Biosynthesis (Saccharomyces cerevisiae)

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Yeast cells contain 3 pathways for the synthesis of glutamate. Two pathways are mediated by two isoforms of glutamate dehydrogenase, encoded by GDH1 and GDH3 (CITS: [2989290])(CITS: [9287019]). The third pathway is driven by the combined activities of glutamine synthetase and glutamate synthase, encoded by GLN1 and GLT1, respectively (CITS: [2570348])(CITS: [8923741]). Studies of GDH1 and GDH3 regulation indicate that the cell uses these isoforms under different growth conditions (CITS: [11562373]). Expression of GDH3 is induced by ethanol and repressed by glucose, whereas GDH1 expression is high in either carbon source. Gdh1p uses alpha-ketoglutarate at a higher rate than Gdh3p. Thus, under fermentative growth conditions, Gdh1p drives glutamate biosynthesis, whereas in nonfermentable or limiting carbon sources, Gdh3p is the key isoform involved in balancing distribution of alpha-ketoglutarate to glutamate biosynthesis and energy metabolism. SOURCE: SGD pathways,


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  1. Holmberg S, Petersen JG; ''Regulation of isoleucine-valine biosynthesis in Saccharomyces cerevisiae.''; Curr Genet, 1988 PubMed Europe PMC


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89690view10:08, 26 September 2016EgonwReplace the CAS number of the salt with that of just the metabolite.
69831view14:53, 11 July 2013EgonwMarked a few DataNodes with CAS registry numbers as metabolites.
69651view20:38, 8 July 2013MaintBotUpdated to 2013 gpml schema
67416view10:58, 26 June 2013DdiglesOntology Term : 'isoleucine biosynthetic pathway' added !
41890view04:53, 2 March 2011MaintBotRemoved redundant pathway information and comments
36616view22:31, 9 April 2010MaintBotDescription and bibliography added from SGD
21205view11:31, 14 November 2008MaintBot[[Pathway:Saccharomyces cerevisiae:Isoleucine Biosynthesis]] moved to [[Pathway:WP250]]: Moved to stable identifier
12752view08:01, 17 May 2008MaintBotautomated metabolite conversion
8789view14:09, 7 January 2008MaintBotAdded to category $category
8787view14:09, 7 January 2008M.BraymerUploaded new pathway

External references


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NameTypeDatabase referenceComment
BAT1GeneProductS000001251 (SGD)
BAT2GeneProductS000003909 (SGD)
ILV1GeneProductS000000888 (SGD)
ILV2GeneProductS000004714 (SGD)
ILV3GeneProductS000003777 (SGD)
ILV5GeneProductS000004347 (SGD)
ILV6GeneProductS000000515 (SGD)
L-glutamateMetabolite56-86-0 (CAS)
L-threonineMetabolite72-19-5 (CAS)
NADPHMetabolite53-57-6 (CAS)

Annotated Interactions

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