TCA cycle - detailed
WikiPathways:WP296
The Saccharomyces cerevisiae WikiPathways TCA cycle diagram connects oxaloacetic acid to citrate, cis-aconitate, D-threo-isocitrate, 2-oxoglutarate, succinyl-CoA, succinate, fumarate, malate, and back to oxaloacetic acid, with supported enzyme and cofactor details from the GPML anchor network.
- Pathway type
- central carbon metabolism
- Organism scope
Pathway network
58 nodes · 75 asserted directed edges
Arrows show recorded subject → object relationships, not necessarily metabolic flow. Select a node for details or an arrow for evidence. Scroll, zoom or find a node to explore.
- Reaction / activity
- Chemical / cofactor
- Protein / complex
- Solid arrow: mechanistic relation
- Dashed arrow: membership, location or cofactor relation
Components and activities
| Node | Kind or role | Source direction |
|---|---|---|
Saccharomyces cerevisiaeNCBITaxon:4932 | taxon | |
succinyl-CoA ligase 1SGD:S000005668 | protein | |
ubiquinone-6CHEBI:52971 | small molecule | |
ADP(3-)CHEBI:456216 | small molecule | |
NAD(+)CHEBI:57540 | small molecule | |
H+CHEBI:15378 | small molecule | |
oxaloacetic acidCHEBI:30744 | small molecule | |
citrate synthase 1SGD:S000005284 | protein | |
cytoplasmic malate dehydrogenaseSGD:S000005486 | protein | |
cis-aconitateCHEBI:16383 | small molecule | |
succinate dehydrogenase 3SGD:S000001624 | protein | |
ATP(4-)CHEBI:30616 | small molecule | |
succinate dehydrogenase 1SGD:S000001631 | protein | |
mitochondrial malate dehydrogenaseSGD:S000001568 | protein | |
citrate synthase 2SGD:S000000598 | protein | |
coenzyme ACHEBI:15346 | small molecule | |
aconitaseSGD:S000004295 | protein | |
isocitrate dehydrogenase 1SGD:S000004982 | protein | |
acetyl-CoACHEBI:15351 | small molecule | |
succinyl-CoA ligase 2SGD:S000003476 | protein | |
fumarate hydrataseSGD:S000006183 | protein | |
succinyl-CoACHEBI:57292 | small molecule | |
hydrogenphosphateCHEBI:43474 | small molecule | |
D-threo-isocitrateCHEBI:15562 | small molecule | |
2-oxoglutarateCHEBI:16810 | small molecule | |
aconitate hydrataseSGD:S000003736 | protein | |
isocitrate dehydrogenase 2SGD:S000005662 | protein | |
succinate dehydrogenase 4SGD:S000002585 | protein | |
citrate synthase 3SGD:S000006205 | protein | |
malate dehydrogenaseSGD:S000002236 | protein | |
2-ketoglutarate dehydrogenaseSGD:S000001387 | protein | |
dihydrolipoyl transsuccinylaseSGD:S000002555 | protein | |
succinate dehydrogenase 2SGD:S000003964 | protein | |
citrateCHEBI:16947 | small molecule | |
H2OCHEBI:15377 | small molecule | |
ubiquinol-6CHEBI:52970 | small molecule | |
CO2CHEBI:16526 | small molecule | |
dihydrolipoamide dehydrogenaseSGD:S000001876 | protein | |
succinateCHEBI:30031 | small molecule | |
fumarateCHEBI:29806 | small molecule | |
malateCHEBI:15589 | small molecule | |
hemeCHEBI:30413 | cofactor | |
FAD(3-)CHEBI:57692 | cofactor | |
tetra-mu3-sulfido-tetraironCHEBI:49883 | cofactor | |
magnesium(2+)CHEBI:18420 | cofactor | |
manganese(2+)CHEBI:29035 | cofactor | |
thiamine(1+) diphosphate(3-)CHEBI:58937 | cofactor | |
(R)-lipoateCHEBI:83088 | cofactor | |
di-mu-sulfido-diironCHEBI:190135 | cofactor | |
tri-mu-sulfido-mu3-sulfido-triironCHEBI:21137 | cofactor | |
succinate to fumarate GPML interactionWikiPathways:WP296/b7797 | molecular activity | left to right |
fumarate to malate GPML interactionWikiPathways:WP296/bec38 | molecular activity | left to right |
malate to oxaloacetic acid GPML interactionWikiPathways:WP296/c084d | molecular activity | left to right |
cis-aconitate to D-threo-isocitrate GPML interactionWikiPathways:WP296/id21c76d83 | molecular activity | left to right |
2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 | molecular activity | left to right |
citrate to cis-aconitate GPML interactionWikiPathways:WP296/id718be16e | molecular activity | left to right |
oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 | molecular activity | left to right |
D-threo-isocitrate to 2-oxoglutarate GPML interactionWikiPathways:WP296/ida3b8a465 | molecular activity | left to right |
succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e | molecular activity | left to right |
Mechanistic edges
| Subject | Predicate and description | Object | Evidence |
|---|---|---|---|
succinateCHEBI:30031 | consumes | succinate to fumarate GPML interactionWikiPathways:WP296/b7797 |
|
succinate to fumarate GPML interactionWikiPathways:WP296/b7797 | produces | fumarateCHEBI:29806 |
|
fumarateCHEBI:29806 | consumes | fumarate to malate GPML interactionWikiPathways:WP296/bec38 |
|
fumarate to malate GPML interactionWikiPathways:WP296/bec38 | produces | malateCHEBI:15589 |
|
malateCHEBI:15589 | consumes | malate to oxaloacetic acid GPML interactionWikiPathways:WP296/c084d |
|
malate to oxaloacetic acid GPML interactionWikiPathways:WP296/c084d | produces | oxaloacetic acidCHEBI:30744 |
|
cis-aconitateCHEBI:16383 | consumes | cis-aconitate to D-threo-isocitrate GPML interactionWikiPathways:WP296/id21c76d83 |
|
cis-aconitate to D-threo-isocitrate GPML interactionWikiPathways:WP296/id21c76d83 | produces | D-threo-isocitrateCHEBI:15562 |
|
2-oxoglutarateCHEBI:16810 | consumes | 2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 |
|
2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 | produces | succinyl-CoACHEBI:57292 |
|
citrateCHEBI:16947 | consumes | citrate to cis-aconitate GPML interactionWikiPathways:WP296/id718be16e |
|
citrate to cis-aconitate GPML interactionWikiPathways:WP296/id718be16e | produces | cis-aconitateCHEBI:16383 |
|
oxaloacetic acidCHEBI:30744 | consumes | oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 |
|
oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 | produces | citrateCHEBI:16947 |
|
D-threo-isocitrateCHEBI:15562 | consumes | D-threo-isocitrate to 2-oxoglutarate GPML interactionWikiPathways:WP296/ida3b8a465 |
|
D-threo-isocitrate to 2-oxoglutarate GPML interactionWikiPathways:WP296/ida3b8a465 | produces | 2-oxoglutarateCHEBI:16810 |
|
succinyl-CoACHEBI:57292 | consumes | succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e |
|
succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e | produces | succinateCHEBI:30031 |
|
citrate to cis-aconitate GPML interactionWikiPathways:WP296/id718be16e | produces | H2OCHEBI:15377 |
|
H2OCHEBI:15377 | consumes | fumarate to malate GPML interactionWikiPathways:WP296/bec38 |
|
H2OCHEBI:15377 | consumes | cis-aconitate to D-threo-isocitrate GPML interactionWikiPathways:WP296/id21c76d83 |
|
oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 | produces | coenzyme ACHEBI:15346 |
|
oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 | produces | H+CHEBI:15378 |
|
aconitate hydrataseSGD:S000003736 | catalyzes | citrate to cis-aconitate GPML interactionWikiPathways:WP296/id718be16e |
|
aconitaseSGD:S000004295 | catalyzes | citrate to cis-aconitate GPML interactionWikiPathways:WP296/id718be16e |
|
succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e | produces | ATP(4-)CHEBI:30616 |
|
succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e | produces | coenzyme ACHEBI:15346 |
|
citrate synthase 1SGD:S000005284 | catalyzes | oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 |
|
citrate synthase 2SGD:S000000598 | catalyzes | oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 |
|
citrate synthase 3SGD:S000006205 | catalyzes | oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 |
|
isocitrate dehydrogenase 1SGD:S000004982 | enables | D-threo-isocitrate to 2-oxoglutarate GPML interactionWikiPathways:WP296/ida3b8a465 |
|
isocitrate dehydrogenase 2SGD:S000005662 | enables | D-threo-isocitrate to 2-oxoglutarate GPML interactionWikiPathways:WP296/ida3b8a465 |
|
succinyl-CoA ligase 1SGD:S000005668 | enables | succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e |
|
succinyl-CoA ligase 2SGD:S000003476 | enables | succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e |
|
NAD(+)CHEBI:57540 | consumes | malate to oxaloacetic acid GPML interactionWikiPathways:WP296/c084d |
|
succinate dehydrogenase 3SGD:S000001624 | enables | succinate to fumarate GPML interactionWikiPathways:WP296/b7797 |
|
succinate dehydrogenase 1SGD:S000001631 | enables | succinate to fumarate GPML interactionWikiPathways:WP296/b7797 |
|
succinate dehydrogenase 4SGD:S000002585 | enables | succinate to fumarate GPML interactionWikiPathways:WP296/b7797 |
|
succinate dehydrogenase 2SGD:S000003964 | enables | succinate to fumarate GPML interactionWikiPathways:WP296/b7797 |
|
acetyl-CoACHEBI:15351 | consumes | oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 |
|
H2OCHEBI:15377 | consumes | oxaloacetic acid to citrate GPML interactionWikiPathways:WP296/id892d5e82 |
|
cytoplasmic malate dehydrogenaseSGD:S000005486 | catalyzes | malate to oxaloacetic acid GPML interactionWikiPathways:WP296/c084d |
|
mitochondrial malate dehydrogenaseSGD:S000001568 | catalyzes | malate to oxaloacetic acid GPML interactionWikiPathways:WP296/c084d |
|
malate dehydrogenaseSGD:S000002236 | catalyzes | malate to oxaloacetic acid GPML interactionWikiPathways:WP296/c084d |
|
fumarate hydrataseSGD:S000006183 | catalyzes | fumarate to malate GPML interactionWikiPathways:WP296/bec38 |
|
ubiquinone-6CHEBI:52971 | consumes | succinate to fumarate GPML interactionWikiPathways:WP296/b7797 |
|
ADP(3-)CHEBI:456216 | consumes | succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e |
|
hydrogenphosphateCHEBI:43474 | consumes | succinyl-CoA to succinate GPML interactionWikiPathways:WP296/idaf5b761e |
|
NAD(+)CHEBI:57540 | consumes | 2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 |
|
coenzyme ACHEBI:15346 | consumes | 2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 |
|
aconitaseSGD:S000004295 | catalyzes | cis-aconitate to D-threo-isocitrate GPML interactionWikiPathways:WP296/id21c76d83 |
|
NAD(+)CHEBI:57540 | consumes | D-threo-isocitrate to 2-oxoglutarate GPML interactionWikiPathways:WP296/ida3b8a465 |
|
2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 | produces | CO2CHEBI:16526 |
|
2-ketoglutarate dehydrogenaseSGD:S000001387 | enables | 2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 |
|
dihydrolipoyl transsuccinylaseSGD:S000002555 | enables | 2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 |
|
dihydrolipoamide dehydrogenaseSGD:S000001876 | enables | 2-oxoglutarate to succinyl-CoA GPML interactionWikiPathways:WP296/id238f9689 |
|
D-threo-isocitrate to 2-oxoglutarate GPML interactionWikiPathways:WP296/ida3b8a465 | produces | CO2CHEBI:16526 |
|
malate to oxaloacetic acid GPML interactionWikiPathways:WP296/c084d | produces | H+CHEBI:15378 |
|
succinate to fumarate GPML interactionWikiPathways:WP296/b7797 | produces | ubiquinol-6CHEBI:52970 |
|
succinate dehydrogenase 3SGD:S000001624 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: not specified The heme is bound between the two transmembrane subunits. | hemeCHEBI:30413 |
|
succinate dehydrogenase 1SGD:S000001631 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 (UniProtKB:Q0QF01) | FAD(3-)CHEBI:57692 |
|
aconitaseSGD:S000004295 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000269 (PubMed:27738674) Binds 1 [4Fe-4S] cluster per subunit. UniProt note evidence: ECO:0000250 (UniProtKB:P20004) | tetra-mu3-sulfido-tetraironCHEBI:49883 |
|
isocitrate dehydrogenase 1SGD:S000004982 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 Mg(2+) or Mn(2+) ion per subunit. UniProt note evidence: ECO:0000250 | magnesium(2+)CHEBI:18420 |
|
isocitrate dehydrogenase 1SGD:S000004982 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 Mg(2+) or Mn(2+) ion per subunit. UniProt note evidence: ECO:0000250 | manganese(2+)CHEBI:29035 |
|
succinyl-CoA ligase 2SGD:S000003476 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000255 (HAMAP-Rule:MF_03219) Binds 1 Mg(2+) ion per subunit. UniProt note evidence: ECO:0000255 (HAMAP-Rule:MF_03219) | magnesium(2+)CHEBI:18420 |
|
aconitate hydrataseSGD:S000003736 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 (UniProtKB:P20004) Binds 1 [4Fe-4S] cluster per subunit. UniProt note evidence: ECO:0000250 (UniProtKB:P20004) | tetra-mu3-sulfido-tetraironCHEBI:49883 |
|
isocitrate dehydrogenase 2SGD:S000005662 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 Mg(2+) or Mn(2+) ion per subunit. UniProt note evidence: ECO:0000250 | magnesium(2+)CHEBI:18420 |
|
isocitrate dehydrogenase 2SGD:S000005662 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 Mg(2+) or Mn(2+) ion per subunit. UniProt note evidence: ECO:0000250 | manganese(2+)CHEBI:29035 |
|
2-ketoglutarate dehydrogenaseSGD:S000001387 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: not specified | thiamine(1+) diphosphate(3-)CHEBI:58937 |
|
2-ketoglutarate dehydrogenaseSGD:S000001387 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 (UniProtKB:Q02218) | magnesium(2+)CHEBI:18420 |
|
dihydrolipoyl transsuccinylaseSGD:S000002555 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. Reviewed source qualification: The source describes a covalently attached cofactor moiety. Keep that bound-state qualification; no free cosubstrate consumption is inferred. UniProt evidence: not specified Binds 1 lipoyl cofactor covalently. | (R)-lipoateCHEBI:83088 |
|
succinate dehydrogenase 2SGD:S000003964 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 [2Fe-2S] cluster. UniProt note evidence: ECO:0000250 | di-mu-sulfido-diironCHEBI:190135 |
|
succinate dehydrogenase 2SGD:S000003964 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 [3Fe-4S] cluster. UniProt note evidence: ECO:0000250 | tri-mu-sulfido-mu3-sulfido-triironCHEBI:21137 |
|
succinate dehydrogenase 2SGD:S000003964 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 [4Fe-4S] cluster. UniProt note evidence: ECO:0000250 | tetra-mu3-sulfido-tetraironCHEBI:49883 |
|
dihydrolipoamide dehydrogenaseSGD:S000001876 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000269 (PubMed:9538259); ECO:0000269 (Reference:Ref.13) Binds 1 FAD per subunit. UniProt note evidence: ECO:0000269 (PubMed:9538259); ECO:0000269 (Reference:Ref.13) | FAD(3-)CHEBI:57692 |
|
References
CHEBI:30744ChEBI oxaloacetic acid JSON API recordWikiPathways:WP296WP296 native structured pathway source (source version: WP296_r20260922081654)UniProtKB:P33421UniProtKB P33421 cofactor annotations (source version: 2026_03)UniProtKB:Q00711UniProtKB Q00711 cofactor annotations (source version: 2026_03)UniProtKB:P19414UniProtKB P19414 cofactor annotations (source version: 2026_03)UniProtKB:P28834UniProtKB P28834 cofactor annotations (source version: 2026_03)UniProtKB:P53312UniProtKB P53312 cofactor annotations (source version: 2026_03)UniProtKB:P39533UniProtKB P39533 cofactor annotations (source version: 2026_03)UniProtKB:P28241UniProtKB P28241 cofactor annotations (source version: 2026_03)UniProtKB:P20967UniProtKB P20967 cofactor annotations (source version: 2026_03)UniProtKB:P19262UniProtKB P19262 cofactor annotations (source version: 2026_03)UniProtKB:P21801UniProtKB P21801 cofactor annotations (source version: 2026_03)UniProtKB:P09624UniProtKB P09624 cofactor annotations (source version: 2026_03)
Curation history
- Codex
- EDIT — Review complete causal graph against native sources and correct unsupported or omitted relationships
Restored supported anchor cofactors and enzyme components; multisubunit groups enable the reaction instead of each subunit being independently catalytic. Q6 replaces the native Q9 cross-reference; source ATP and CoA CAS crossrefs incorrectly identify dATP and F420 and are corrected by reaction context and named chemical identity. Anaplerotic pyruvate branch is outside the retained TCA-cycle scope. Every native record was inspected; see reports/causal-graph-diagram-review.json for native-object counts, exclusions and identity corrections. Semantic validation and native GraphId locator checks passed; authority snapshots and full corpus gates are coordinated separately.
- EDIT — Review complete causal graph against native sources and correct unsupported or omitted relationships