fatty acid elongation
gomodel:YeastPathways_FASYN-ELONG2-PWY
Fatty acid elongation in Saccharomyces cerevisiae S288C uses CEM1, OAR1, FAS1, and FAS2 to condense and reduce acyl-carrier protein intermediates through 3-oxoacyl-[acp], (3R)-3-hydroxyacyl-[acyl-carrier-protein], enoyl-[acp], palmitoyl-[acp], and palmitoyl-CoA, then uses TES1 to hydrolyze palmitoyl-CoA to palmitate.
- Pathway type
- fatty acid elongation
- Organism scope
Pathway network
30 nodes · 70 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 | |
fatty acid elongationGO:0030497 | biological process | |
acetoacetyl-[acp]CHEBI:2393 | protein | |
acyl-carrier proteinCHEBI:13534 | protein | |
hydronCHEBI:15378 | small molecule | |
NADP(3-)CHEBI:58349 | small molecule | |
cytosolGO:0005829 | cellular component | |
FAS2 ScerSGD:S000006152 | protein | |
OAR1 ScerSGD:S000001538 | protein | |
hexadecanoateCHEBI:7896 | lipid | |
waterCHEBI:15377 | small molecule | |
(3R)-3-hydroxyacyl-[acyl-carrier-protein]CHEBI:84648 | protein | |
CEM1 ScerSGD:S000000863 | protein | |
FAS1 ScerSGD:S000001665 | protein | |
acyl-[acyl-carrier protein]CHEBI:16018 | protein | |
coenzyme A(4-)CHEBI:57287 | small molecule | |
NADPH(4-)CHEBI:57783 | small molecule | |
carbon dioxideCHEBI:16526 | small molecule | |
palmitoyl-CoA(4-)CHEBI:57379 | small molecule | |
palmitoyl-[acyl-carrier protein]CHEBI:5697 | protein | |
TES1 ScerSGD:S000003780 | protein | |
mitochondrionGO:0005739 | cellular component | |
peroxisomeGO:0005777 | cellular component | |
a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN | molecular activity | |
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | molecular activity | |
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | molecular activity | |
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | molecular activity | |
palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN | molecular activity | |
a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 | molecular activity | |
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | molecular activity | |
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | molecular activity |
Mechanistic edges
| Subject | Predicate and description | Object | Evidence |
|---|---|---|---|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | part_of | fatty acid elongationGO:0030497 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | has_input | acetoacetyl-[acp]CHEBI:2393 |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | has_output | acyl-carrier proteinCHEBI:13534 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | provides_input_for | a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN |
|
palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN | part_of | fatty acid elongationGO:0030497 |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | has_input | hydronCHEBI:15378 |
|
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | provides_input_for | a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 |
|
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | has_output | NADP(3-)CHEBI:58349 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | occurs_in | cytosolGO:0005829 |
|
FAS2 ScerSGD:S000006152 | enables | a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN |
|
OAR1 ScerSGD:S000001538 | enables | 3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 |
|
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | part_of | fatty acid elongationGO:0030497 |
|
palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN | has_output | hexadecanoateCHEBI:7896 |
|
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | occurs_in | cytosolGO:0005829 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | has_output | NADP(3-)CHEBI:58349 |
|
a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 | occurs_in | cytosolGO:0005829 |
|
palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN | has_input | waterCHEBI:15377 |
|
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | has_output | acyl-carrier proteinCHEBI:13534 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN | has_input | (3R)-3-hydroxyacyl-[acyl-carrier-protein]CHEBI:84648 |
|
CEM1 ScerSGD:S000000863 | enables | a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN | occurs_in | cytosolGO:0005829 |
|
FAS1 ScerSGD:S000001665 | enables | a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 |
|
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | provides_input_for | a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN |
|
a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 | part_of | fatty acid elongationGO:0030497 |
|
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | part_of | fatty acid elongationGO:0030497 |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | provides_input_for | a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | occurs_in | cytosolGO:0005829 |
|
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | has_input | hydronCHEBI:15378 |
|
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | has_output | acetoacetyl-[acp]CHEBI:2393 |
|
palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN | has_output | hydronCHEBI:15378 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN | has_output | acyl-[acyl-carrier protein]CHEBI:16018 |
|
palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN | has_output | coenzyme A(4-)CHEBI:57287 |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | has_output | acetoacetyl-[acp]CHEBI:2393 |
|
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | provides_input_for | a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | has_input | hydronCHEBI:15378 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN | has_output | waterCHEBI:15377 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | has_input | NADPH(4-)CHEBI:57783 |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | has_output | carbon dioxideCHEBI:16526 |
|
a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 | has_output | palmitoyl-CoA(4-)CHEBI:57379 |
|
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | has_input | acetoacetyl-[acp]CHEBI:2393 |
|
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | provides_input_for | 3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 |
|
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | has_input | NADPH(4-)CHEBI:57783 |
|
FAS1 ScerSGD:S000001665 | enables | a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN |
|
palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN | has_input | palmitoyl-CoA(4-)CHEBI:57379 |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | has_input | acyl-[acyl-carrier protein]CHEBI:16018 |
|
a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 | has_input | coenzyme A(4-)CHEBI:57287 |
|
a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 | has_input | palmitoyl-[acyl-carrier protein]CHEBI:5697 |
|
a palmitoyl-[acp] + coenzyme A -> palmitoyl-CoA + acyl-carrier proteingomodel:RXN3O-9780 | provides_input_for | palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN |
|
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | has_output | NADP(3-)CHEBI:58349 |
|
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | has_input | hydronCHEBI:15378 |
|
FAS2 ScerSGD:S000006152 | enables | 3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 |
|
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | has_output | acyl-[acyl-carrier protein]CHEBI:16018 |
|
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | has_output | (3R)-3-hydroxyacyl-[acyl-carrier-protein]CHEBI:84648 |
|
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | has_input | acyl-[acyl-carrier protein]CHEBI:16018 |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | provides_input_for | 3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 |
|
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | has_input | NADPH(4-)CHEBI:57783 |
|
3-oxoacyl-[acyl-carrier-protein] synthase activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003411 | part_of | fatty acid elongationGO:0030497 |
|
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | part_of | fatty acid elongationGO:0030497 |
|
a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN | has_input | acyl-[acyl-carrier protein]CHEBI:16018 |
|
a 2,3,4-saturated fatty acyl-[acp] + a malonyl-[acp] + H+ -> acyl-carrier protein + a 3-oxoacyl-[acp] + CO2gomodel:3-OXOACYL-ACP-SYNTH-RXN | has_output | carbon dioxideCHEBI:16526 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] + NADP+ ← a 3-oxoacyl-[acp] + NADPH + H+gomodel:3-OXOACYL-ACP-REDUCT-RXN | has_output | (3R)-3-hydroxyacyl-[acyl-carrier-protein]CHEBI:84648 |
|
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | has_input | hydronCHEBI:15378 |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN | part_of | fatty acid elongationGO:0030497 |
|
FAS1 ScerSGD:S000001665 | enables | a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN |
|
a (3R)-3-hydroxyacyl-[acyl-carrier protein] -> a trans-2-enoyl-[acyl-carrier protein] + H2Ogomodel:3-HYDROXYDECANOYL-ACP-DEHYDR-RXN | provides_input_for | a 2,3,4-saturated fatty acyl-[acp] + NADP+ ← a trans-2-enoyl-[acyl-carrier protein] + NADPH + H+gomodel:ENOYL-ACP-REDUCT-NADPH-RXN |
|
TES1 ScerSGD:S000003780 | enables | palmitoyl-CoA + H2O -> palmitate + coenzyme A + H+gomodel:PALMITOYL-COA-HYDROLASE-RXN |
|
OAR1 ScerSGD:S000001538 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095) | mitochondrionGO:0005739 |
|
CEM1 ScerSGD:S000000863 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095); ECO:0000269 (PubMed:16823961) | mitochondrionGO:0005739 |
|
TES1 ScerSGD:S000003780 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:10092594) | peroxisomeGO:0005777 |
|
3-oxoacyl-[acyl-carrier-protein] reductase (NADPH) activitygomodel:YeastPathways_FASYN-ELONG2-PWY/6a4c244800003428 | occurs_in Activity compartment supported by an inspected functional annotation. ECO:0000250; ECO:0000269 (PubMed:9388293). Alternative isoenzymes may function elsewhere. | mitochondrionGO:0005739 |
|
References
gomodel:YeastPathways_FASYN-ELONG2-PWYSGD GO-CAM fatty acid elongation pathway FASYN-ELONG2-PWY (source version: Pinned Noctua JSON archive; model date 2026-07-15; member ./YeastPathways_FASYN-ELONG2-PWY.json)UniProtKB:P35731Reviewed UniProtKB P35731 location annotations (source version: UniProt release 2026_03)UniProtKB:P39525Reviewed UniProtKB P39525 location annotations (source version: UniProt release 2026_03)UniProtKB:P41903Reviewed UniProtKB P41903 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 8 activity location assignments and 5 mapped physical proteins against reviewed S288C UniProt release2026_03 location/function/caution batch SHA256 95f72dcc644358c480e0e59f996cf88533558b5fa4256460a030e0a1eaf9678d. Added 4 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