leucine degradation
gomodel:YeastPathways_PWY3O-4112
Leucine degradation in Saccharomyces cerevisiae S288C uses branched-chain amino acid aminotransferase, 4-methyl-2-oxopentanoate decarboxylase, and alcohol dehydrogenase activities to convert L-leucine through 4-methyl-2-oxopentanoate and 3-methylbutanal to isoamylol.
- Pathway type
- leucine degradation
- Organism scope
Pathway network
38 nodes · 81 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
- Cell / process context
- Solid arrow: mechanistic relation
- Dashed arrow: membership, location or cofactor relation
Components and activities
| Node | Kind or role | Source direction |
|---|---|---|
Saccharomyces cerevisiae S288CNCBITaxon:559292 | taxon | |
cytosolGO:0005829 | cellular component | |
NADH(2-)CHEBI:57945 | small molecule | |
ADH1 ScerSGD:S000005446 | protein | |
L-leucine catabolic processGO:0006552 | biological process | |
L-leucine zwitterionCHEBI:57427 | small molecule | |
4-methyl-2-oxopentanoateCHEBI:17865 | small molecule | |
NAD(1-)CHEBI:57540 | small molecule | |
3-methylbutanalCHEBI:16638 | small molecule | |
isoamylolCHEBI:15837 | small molecule | |
ARO10 ScerSGD:S000002788 | protein | |
BAT2 ScerSGD:S000003909 | protein | |
L-glutamate(1-)CHEBI:29985 | small molecule | |
2-oxoglutarate(2-)CHEBI:16810 | small molecule | |
SFA1 ScerSGD:S000002327 | protein | |
carbon dioxideCHEBI:16526 | small molecule | |
BAT1 ScerSGD:S000001251 | protein | |
ADH3 ScerSGD:S000004688 | protein | |
ADH4 ScerSGD:S000003225 | protein | |
ADH5 ScerSGD:S000000349 | protein | |
ADH2 ScerSGD:S000004918 | protein | |
cytoplasmGO:0005737 | cellular component | |
mitochondrionGO:0005739 | cellular component | |
mitochondrial matrixGO:0005759 | cellular component | |
mitochondrial inner membraneGO:0005743 | cellular component | |
zinc(2+)CHEBI:29105 | cofactor | |
magnesium(2+)CHEBI:18420 | cofactor | |
thiamine(1+) diphosphate(3-)CHEBI:58937 | cofactor | |
pyridoxal 5'-phosphate(2-)CHEBI:597326 | cofactor | |
iron(2+)CHEBI:29033 | cofactor | |
L-leucine + 2-oxoglutarate <=> L-glutamate + 4-methyl-2-oxopentanoategomodel:BRANCHED-CHAINAMINOTRANSFERLEU-RXN | molecular activity | |
4-methyl-2-oxopentanoate -> 3-methylbutanal + CO2gomodel:RXN3O-4108 | molecular activity | |
3-methylbutanal + NADH -> 3-methylbutanol + NAD+gomodel:RXN3O-4109 | molecular activity | |
L-isoleucine:2-oxoglutarate transaminase activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001175 | molecular activity | |
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001189 | molecular activity | |
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001207 | molecular activity | |
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001224 | molecular activity | |
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001240 | molecular activity | |
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001255 | molecular activity |
Mechanistic edges
| Subject | Predicate and description | Object | Evidence |
|---|---|---|---|
4-methyl-2-oxopentanoate -> 3-methylbutanal + CO2gomodel:RXN3O-4108 | occurs_in | cytosolGO:0005829 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001255 | occurs_in | cytosolGO:0005829 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001240 | occurs_in | cytosolGO:0005829 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001224 | has_input | NADH(2-)CHEBI:57945 |
|
ADH1 ScerSGD:S000005446 | enables | 3-methylbutanal + NADH -> 3-methylbutanol + NAD+gomodel:RXN3O-4109 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001224 | part_of | L-leucine catabolic processGO:0006552 |
|
L-isoleucine:2-oxoglutarate transaminase activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001175 | has_input | L-leucine zwitterionCHEBI:57427 |
|
L-leucine + 2-oxoglutarate <=> L-glutamate + 4-methyl-2-oxopentanoategomodel:BRANCHED-CHAINAMINOTRANSFERLEU-RXN | has_output | 4-methyl-2-oxopentanoateCHEBI:17865 |
|
3-methylbutanal + NADH -> 3-methylbutanol + NAD+gomodel:RXN3O-4109 | has_input | NADH(2-)CHEBI:57945 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001189 | has_input | NADH(2-)CHEBI:57945 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001240 | has_output | NAD(1-)CHEBI:57540 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001240 | has_input | NADH(2-)CHEBI:57945 |
|
4-methyl-2-oxopentanoate -> 3-methylbutanal + CO2gomodel:RXN3O-4108 | has_input | 4-methyl-2-oxopentanoateCHEBI:17865 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001189 | has_output | NAD(1-)CHEBI:57540 |
|
L-isoleucine:2-oxoglutarate transaminase activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001175 | has_output | 4-methyl-2-oxopentanoateCHEBI:17865 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001255 | part_of | L-leucine catabolic processGO:0006552 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001255 | has_output | NAD(1-)CHEBI:57540 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001255 | has_input | NADH(2-)CHEBI:57945 |
|
4-methyl-2-oxopentanoate -> 3-methylbutanal + CO2gomodel:RXN3O-4108 | has_output | 3-methylbutanalCHEBI:16638 |
|
L-leucine + 2-oxoglutarate <=> L-glutamate + 4-methyl-2-oxopentanoategomodel:BRANCHED-CHAINAMINOTRANSFERLEU-RXN | has_input | L-leucine zwitterionCHEBI:57427 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001207 | has_output | isoamylolCHEBI:15837 |
|
ARO10 ScerSGD:S000002788 | enables | 4-methyl-2-oxopentanoate -> 3-methylbutanal + CO2gomodel:RXN3O-4108 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001207 | has_output | NAD(1-)CHEBI:57540 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001224 | has_output | isoamylolCHEBI:15837 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001189 | has_output | isoamylolCHEBI:15837 |
|
L-leucine + 2-oxoglutarate <=> L-glutamate + 4-methyl-2-oxopentanoategomodel:BRANCHED-CHAINAMINOTRANSFERLEU-RXN | part_of | L-leucine catabolic processGO:0006552 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001189 | part_of | L-leucine catabolic processGO:0006552 |
|
BAT2 ScerSGD:S000003909 | enables | L-isoleucine:2-oxoglutarate transaminase activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001175 |
|
L-isoleucine:2-oxoglutarate transaminase activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001175 | part_of | L-leucine catabolic processGO:0006552 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001189 | has_input | 3-methylbutanalCHEBI:16638 |
|
L-isoleucine:2-oxoglutarate transaminase activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001175 | has_output | L-glutamate(1-)CHEBI:29985 |
|
4-methyl-2-oxopentanoate -> 3-methylbutanal + CO2gomodel:RXN3O-4108 | part_of | L-leucine catabolic processGO:0006552 |
|
L-isoleucine:2-oxoglutarate transaminase activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001175 | occurs_in | cytosolGO:0005829 |
|
3-methylbutanal + NADH -> 3-methylbutanol + NAD+gomodel:RXN3O-4109 | occurs_in | cytosolGO:0005829 |
|
L-isoleucine:2-oxoglutarate transaminase activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001175 | has_input | 2-oxoglutarate(2-)CHEBI:16810 |
|
SFA1 ScerSGD:S000002327 | enables | alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001255 |
|
4-methyl-2-oxopentanoate -> 3-methylbutanal + CO2gomodel:RXN3O-4108 | has_output | carbon dioxideCHEBI:16526 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001240 | part_of | L-leucine catabolic processGO:0006552 |
|
L-leucine + 2-oxoglutarate <=> L-glutamate + 4-methyl-2-oxopentanoategomodel:BRANCHED-CHAINAMINOTRANSFERLEU-RXN | has_input | 2-oxoglutarate(2-)CHEBI:16810 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001240 | has_input | 3-methylbutanalCHEBI:16638 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001240 | has_output | isoamylolCHEBI:15837 |
|
L-leucine + 2-oxoglutarate <=> L-glutamate + 4-methyl-2-oxopentanoategomodel:BRANCHED-CHAINAMINOTRANSFERLEU-RXN | has_output | L-glutamate(1-)CHEBI:29985 |
|
BAT1 ScerSGD:S000001251 | enables | L-leucine + 2-oxoglutarate <=> L-glutamate + 4-methyl-2-oxopentanoategomodel:BRANCHED-CHAINAMINOTRANSFERLEU-RXN |
|
ADH3 ScerSGD:S000004688 | enables | alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001207 |
|
3-methylbutanal + NADH -> 3-methylbutanol + NAD+gomodel:RXN3O-4109 | has_output | isoamylolCHEBI:15837 |
|
3-methylbutanal + NADH -> 3-methylbutanol + NAD+gomodel:RXN3O-4109 | part_of | L-leucine catabolic processGO:0006552 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001207 | part_of | L-leucine catabolic processGO:0006552 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001255 | has_output | isoamylolCHEBI:15837 |
|
3-methylbutanal + NADH -> 3-methylbutanol + NAD+gomodel:RXN3O-4109 | has_output | NAD(1-)CHEBI:57540 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001255 | has_input | 3-methylbutanalCHEBI:16638 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001207 | has_input | 3-methylbutanalCHEBI:16638 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001189 | occurs_in | cytosolGO:0005829 |
|
ADH4 ScerSGD:S000003225 | enables | alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001224 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001224 | has_input | 3-methylbutanalCHEBI:16638 |
|
ADH5 ScerSGD:S000000349 | enables | alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001240 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001207 | has_input | NADH(2-)CHEBI:57945 |
|
3-methylbutanal + NADH -> 3-methylbutanol + NAD+gomodel:RXN3O-4109 | has_input | 3-methylbutanalCHEBI:16638 |
|
ADH2 ScerSGD:S000004918 | enables | alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001189 |
|
alcohol dehydrogenase (NAD+) activitygomodel:YeastPathways_PWY3O-4112/6a4c244800001224 | has_output | NAD(1-)CHEBI:57540 |
|
ADH1 ScerSGD:S000005446 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:2937632) | cytoplasmGO:0005737 |
|
ARO10 ScerSGD:S000002788 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095) | cytoplasmGO:0005737 |
|
BAT2 ScerSGD:S000003909 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:21267457); ECO:0000269 (PubMed:8798704) | cytoplasmGO:0005737 |
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SFA1 ScerSGD:S000002327 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095) | cytoplasmGO:0005737 |
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SFA1 ScerSGD:S000002327 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:16823961) | mitochondrionGO:0005739 |
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BAT1 ScerSGD:S000001251 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:21267457); ECO:0000269 (PubMed:8798704) | mitochondrial matrixGO:0005759 |
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ADH3 ScerSGD:S000004688 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:1101965); ECO:0000269 (PubMed:2188098); ECO:0000269 (PubMed:2943982) | mitochondrial matrixGO:0005759 |
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ADH3 ScerSGD:S000004688 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:2937632) | mitochondrial inner membraneGO:0005743 |
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ADH4 ScerSGD:S000003225 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095) | mitochondrionGO:0005739 |
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ADH5 ScerSGD:S000000349 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095) | cytoplasmGO:0005737 |
|
ADH2 ScerSGD:S000004918 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095); ECO:0000269 (PubMed:2937632) | cytoplasmGO:0005737 |
|
ADH1 ScerSGD:S000005446 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000269 (PubMed:25157460); ECO:0000269 (PubMed:26743849) Binds 2 Zn(2+) ions per subunit. UniProt note evidence: ECO:0000269 (PubMed:25157460); ECO:0000269 (PubMed:26743849) | zinc(2+)CHEBI:29105 |
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ARO10 ScerSGD:S000002788 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 Mg(2+) per subunit. UniProt note evidence: ECO:0000250 | magnesium(2+)CHEBI:18420 |
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ARO10 ScerSGD:S000002788 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 thiamine pyrophosphate per subunit. UniProt note evidence: ECO:0000250 | thiamine(1+) diphosphate(3-)CHEBI:58937 |
|
BAT2 ScerSGD:S000003909 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: not specified | pyridoxal 5'-phosphate(2-)CHEBI:597326 |
|
SFA1 ScerSGD:S000002327 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 (UniProtKB:P06525) Binds 2 Zn(2+) ions per subunit. UniProt note evidence: ECO:0000250 (UniProtKB:P06525) | zinc(2+)CHEBI:29105 |
|
BAT1 ScerSGD:S000001251 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. Reviewed source qualification: Disputed growth phenotypes do not address PLP binding; retain the similarity-based PLP annotation. UniProt evidence: ECO:0000250 (UniProtKB:P0AB80) | pyridoxal 5'-phosphate(2-)CHEBI:597326 |
|
ADH3 ScerSGD:S000004688 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 (UniProtKB:P00330) Binds 2 Zn(2+) ions per subunit. UniProt note evidence: ECO:0000250 (UniProtKB:P00330) | zinc(2+)CHEBI:29105 |
|
ADH4 ScerSGD:S000003225 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000269 (PubMed:3282541) Zinc. May bind iron when zinc levels are limiting. UniProt note evidence: ECO:0000269 (PubMed:3282541) | zinc(2+)CHEBI:29105 |
|
ADH4 ScerSGD:S000003225 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000269 (PubMed:3282541) Zinc. May bind iron when zinc levels are limiting. UniProt note evidence: ECO:0000269 (PubMed:3282541) | iron(2+)CHEBI:29033 |
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ADH5 ScerSGD:S000000349 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 (UniProtKB:P00330) Binds 2 Zn(2+) ions per subunit. UniProt note evidence: ECO:0000250 (UniProtKB:P00330) | zinc(2+)CHEBI:29105 |
|
ADH2 ScerSGD:S000004918 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 (UniProtKB:P00330) Binds 2 Zn(2+) ions per subunit. UniProt note evidence: ECO:0000250 (UniProtKB:P00330) | zinc(2+)CHEBI:29105 |
|
References
gomodel:YeastPathways_PWY3O-4112SGD GO-CAM leucine degradation - imported from: Saccharomyces Genome Database (source version: Pinned Noctua JSON archive; model date 2026-07-10; member ./YeastPathways_PWY3O-4112.json)UniProtKB:P00330Reviewed UniProtKB P00330 location annotations (source version: UniProt release 2026_03)UniProtKB:Q06408Reviewed UniProtKB Q06408 location annotations (source version: UniProt release 2026_03)UniProtKB:P47176Reviewed UniProtKB P47176 location annotations (source version: UniProt release 2026_03)UniProtKB:P32771Reviewed UniProtKB P32771 location annotations (source version: UniProt release 2026_03)UniProtKB:P38891Reviewed UniProtKB P38891 location annotations (source version: UniProt release 2026_03)UniProtKB:P07246Reviewed UniProtKB P07246 location annotations (source version: UniProt release 2026_03)UniProtKB:P10127Reviewed UniProtKB P10127 location annotations (source version: UniProt release 2026_03)UniProtKB:P38113Reviewed UniProtKB P38113 location annotations (source version: UniProt release 2026_03)UniProtKB:P00331Reviewed UniProtKB P00331 location annotations (source version: UniProt release 2026_03)
Curation history
- Codex; review-causal-graph; Reviewed every native GO-CAM fact; preserved precise input/output, causal, location, membership and complex-part relations with traceable structured source evidence. Kept distinct generic physical instances and recorded source-scope exclusions in the cohort review ledger.
- Codex
- EDIT — Audit causal activity compartments and preserve scoped protein location evidence
Reviewed all 9 activity location assignments and 9 mapped physical proteins against reviewed S288C UniProt release2026_03 location/function/caution batch SHA256 95f72dcc644358c480e0e59f996cf88533558b5fa4256460a030e0a1eaf9678d. Added 11 independently supported location edges and quarantined 3 generic cytosol source assertions. Mapped physical protein locations via exact SGD cross-references; retained source ECO grades, molecular form and conditional notes. Physical protein location alone never generates activity location. Explicitly inspected functional assertions support bounded activity projections. Every original activity location and exclusion is recorded in reports/causal_graph_review/gocam-location-review.json. No independent location annotation is treated as an evidence gap, not a negative result. Cytoplasm is not narrowed to cytosol. Microsome fractions are not projected as in-vivo organelles. Semantic validation passed all85 records;4 independent source-role acceptance tests passed.
- EDIT — Audit causal activity compartments and preserve scoped protein location evidence