De novo biosynthesis of purine nucleotides (Saccharomyces cerevisiae)

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1-3AMPL-aspartateTHFH2OdADP5-phosphoribosylamineH2Oreduced flavodoxinfumarateoxidized flavodoxinH2O5'-phosphoribosyl-N-formylglycineamideoxidized thioredoxinH2ONADH2Ophosphoribosyl-formamido-carboxamideH2OH2OIMPAMPH2OCO2phosphoribosyl-carboxy-aminoimidazoleH2O5-phospho-ribosyl-glycineamidedeoxy-GTPoxidized flavodoxinL-aspartateNH35-phosphoribosyl-n-formylglycineamideAMPreduced flavodoxinoxidized thioredoxinfumarateadenylo-succinatereduced thioredoxinreduced thioredoxinH2Odeoxy-ATP5'-phosphoribosyl-5-aminoimidazole5'-phosphoribosyl-4-(N-succinocarboxamide)-5-aminoimidazoleATPphosphateRNR210-formyl-THFRNR3IMD2ATPL-glutamineADE1IMD4GMPADPNADHL-glutamateGUA1ATPADE13L-glutamateRNR1ADK2ADPATPIMD3GUK1GTPL-glycineRNR2ATPGTPADPADE8ADPADK1L-glutaminephosphatepyrophosphateADPYNK1ADPphosphateRNR3xanthosine-5-phosphateATPpyrophosphateATPADE6phosphatedGDPAICARRNR1phosphateADE16ATPADE5,7ATPADE2L-glutamatePRPPADPATPL-glutamineATPGDPADE4ADPphosphateGDPADE5,7ADE17ADE13ADPRNR4pyrophosphateRNR4ATPADPADE12ATPADPATP


The ergosterol biosynthesis pathway is required for generation of a major constituent of the fungal plasma membrane, ergosterol (CITS: [Paltauf])(CITS: [8561481]). This pathway is fungal-specific; plasma membranes of other organisms are composed predominantly of other types of sterol. However, the pathway is not universally present in fungi; for example, Pneumocystis carinii plasma membranes lack ergosterol (CITS: [12531182]). In S. cerevisiae, some steps in the pathway are dispensible while others are essential for viability (CITS: [8277826]). The ergosterol biosynthesis pathway has been the subject of intensive investigation as a target of antifungal drugs (CITS: [11815273]). The major target of azole antifungal drugs is lanosterol 14-alpha demethylase, a member of the cytochrome P450 family known as Erg11 protein in many fungal species. Squalene epoxidase (Erg1p in S. cerevisiae) is the specific target of allylamine drugs such as terbinafine (CITS: [14638499]). Mutations in the genes encoding these enzymes and others in the pathway, as well as alterations in the expression levels of the pathway constituents, can lead to antifungal drug resistance (CITS: [11815273]). SOURCE: SGD pathways,


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  1. Rébora K, Desmoucelles C, Borne F, Pinson B, Daignan-Fornier B; ''Yeast AMP pathway genes respond to adenine through regulated synthesis of a metabolic intermediate.''; Mol Cell Biol, 2001 PubMed Europe PMC Scholia
  2. Rébora K, Laloo B, Daignan-Fornier B; ''Revisiting purine-histidine cross-pathway regulation in Saccharomyces cerevisiae: a central role for a small molecule.''; Genetics, 2005 PubMed Europe PMC Scholia
  3. Escobar-Henriques M, Daignan-Fornier B; ''Transcriptional regulation of the yeast gmp synthesis pathway by its end products.''; J Biol Chem, 2001 PubMed Europe PMC Scholia


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118180view10:47, 25 May 2021EweitzModified title
97912view16:16, 23 June 2018EgonwReplaced a salt with a parent ID (from PubChem)
71893view10:20, 22 October 2013Mkutmoncahnged AICAR to metabolite and connected some lines
70262view21:45, 15 July 2013MaintBotupdated to 2013 schema
69821view14:39, 11 July 2013EgonwMarked a few DataNodes with CAS registry numbers as metabolites.
67144view10:12, 26 June 2013Christine ChichesterOntology Term : 'de novo purine biosynthetic pathway' added !
41834view04:50, 2 March 2011MaintBotRemoved redundant pathway information and comments
36663view23:01, 9 April 2010MaintBot
36627view22:33, 9 April 2010MaintBotDescription and bibliography added from SGD
21107view11:30, 14 November 2008MaintBot[[Pathway:Saccharomyces cerevisiae:De Novo Biosynthesis of Purine Nucleotides]] moved to [[Pathway:WP203]]: Moved to stable identifier
12682view07:57, 17 May 2008MaintBotautomated metabolite conversion
8684view14:06, 7 January 2008MaintBotAdded to category $category
8682view14:06, 7 January 2008M.BraymerUploaded new pathway

External references


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NameTypeDatabase referenceComment
10-formyl-THFMetabolite2800-34-2 (CAS)
ADE12GeneProductS000005164 (SGD)
ADE13GeneProductS000004351 (SGD)
ADE16GeneProductS000004018 (SGD)
ADE17GeneProductS000004727 (SGD)
ADE1GeneProductS000000070 (SGD)
ADE2GeneProductS000005654 (SGD)
ADE4GeneProductS000004915 (SGD)
ADE5,7GeneProductS000003203 (SGD)
ADE6GeneProductS000003293 (SGD)
ADE8GeneProductS000002816 (SGD)
ADK1GeneProductS000002634 (SGD)
ADK2GeneProductS000000972 (SGD)
ADPMetabolite58-64-0 (CAS)
AICARMetabolite3031-94-5 (CAS)
ATPMetabolite1927-31-7 (CAS)
GDPMetabolite146-91-8 (CAS)
GMPMetabolite85-32-5 (CAS)
GTPMetabolite2564-35-4 (CAS)
GUA1GeneProductS000004830 (SGD)
GUK1GeneProductS000001550 (SGD)
IMD2GeneProductS000001259 (SGD)
IMD3GeneProductS000004424 (SGD)
IMD4GeneProductS000004520 (SGD)
L-glutamateMetabolite56-86-0 (CAS)
L-glutamineMetabolite56-85-9 (CAS)
L-glycineMetabolite56-40-6 (CAS)
NADHMetabolite53-84-9 (CAS)
PRPPMetabolite97-55-2 (CAS)
RNR1GeneProductS000000872 (SGD)
RNR2GeneProductS000003563 (SGD)
RNR3GeneProductS000001328 (SGD)
RNR4GeneProductS000003412 (SGD)
YNK1GeneProductS000001550 (SGD)
dGDPMetabolite644 (PubChem-compound)
phosphateMetabolite14265-44-2 (CAS)
pyrophosphateMetabolite2466-09-3 (CAS)
xanthosine-5-phosphateMetabolite523-98-8 (CAS)

Annotated Interactions

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