phospholipid biosynthesis II (Kennedy pathway)
gomodel:YeastPathways_PWY3O-259
Phospholipid biosynthesis II (Kennedy pathway) in Saccharomyces cerevisiae S288C phosphorylates ethanolaminium to O-phosphonatoethanaminium, converts that intermediate and CTP to CDP-ethanolamine, and transfers phosphoethanolamine from CDP-ethanolamine to 1,2-diacyl-sn-glycerol to form phosphatidylethanolamine.
- Pathway type
- lipid biosynthesis
- Organism scope
Pathway network
23 nodes · 28 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 | |
EKI1 ScerSGD:S000002554 | protein | |
glycerophospholipid biosynthetic processGO:0046474 | biological process | |
hydronCHEBI:15378 | small molecule | |
O-phosphonatoethanaminium(1-)CHEBI:58190 | small molecule | |
ATP(4-)CHEBI:30616 | small molecule | |
cytosolGO:0005829 | cellular component | |
EPT1 ScerSGD:S000001165 | protein | |
1,2-diacyl-sn-glycerolCHEBI:17815 | lipid | |
ADP(3-)CHEBI:456216 | small molecule | |
ECT1 ScerSGD:S000003239 | protein | |
cytidine 5'-monophosphate(2-)CHEBI:60377 | small molecule | |
ethanolaminium(1+)CHEBI:57603 | small molecule | |
phosphatidylethanolamineCHEBI:16038 | lipid | |
diphosphoric acidCHEBI:29888 | small molecule | |
CDP-ethanolamine(1-)CHEBI:57876 | small molecule | |
CTP(4-)CHEBI:37563 | small molecule | |
cytoplasmGO:0005737 | cellular component | |
Golgi membraneGO:0000139 | cellular component | |
nucleusGO:0005634 | cellular component | |
magnesium(2+)CHEBI:18420 | cofactor | |
ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN | molecular activity | |
ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN | molecular activity | |
ethanolaminephosphotransferase activitygomodel:ETHANOLAMINEPHOSPHOTRANSFERASE-RXN | molecular activity |
Mechanistic edges
| Subject | Predicate and description | Object | Evidence |
|---|---|---|---|
EKI1 ScerSGD:S000002554 | enables | ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN |
|
ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN | part_of | glycerophospholipid biosynthetic processGO:0046474 |
|
ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN | has_output | hydronCHEBI:15378 |
|
ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN | has_input | O-phosphonatoethanaminium(1-)CHEBI:58190 |
|
ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN | has_input | ATP(4-)CHEBI:30616 |
|
EPT1 ScerSGD:S000001165 | enables | ethanolaminephosphotransferase activitygomodel:ETHANOLAMINEPHOSPHOTRANSFERASE-RXN |
|
ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN | occurs_in | cytosolGO:0005829 |
|
ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN | has_output | O-phosphonatoethanaminium(1-)CHEBI:58190 |
|
ethanolaminephosphotransferase activitygomodel:ETHANOLAMINEPHOSPHOTRANSFERASE-RXN | has_input | 1,2-diacyl-sn-glycerolCHEBI:17815 |
|
ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN | has_output | ADP(3-)CHEBI:456216 |
|
ECT1 ScerSGD:S000003239 | enables | ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN |
|
ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN | occurs_in | cytosolGO:0005829 |
|
ethanolaminephosphotransferase activitygomodel:ETHANOLAMINEPHOSPHOTRANSFERASE-RXN | has_output | cytidine 5'-monophosphate(2-)CHEBI:60377 |
|
ethanolaminephosphotransferase activitygomodel:ETHANOLAMINEPHOSPHOTRANSFERASE-RXN | has_output | hydronCHEBI:15378 |
|
ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN | has_input | ethanolaminium(1+)CHEBI:57603 |
|
ethanolaminephosphotransferase activitygomodel:ETHANOLAMINEPHOSPHOTRANSFERASE-RXN | has_output | phosphatidylethanolamineCHEBI:16038 |
|
ethanolaminephosphotransferase activitygomodel:ETHANOLAMINEPHOSPHOTRANSFERASE-RXN | part_of | glycerophospholipid biosynthetic processGO:0046474 |
|
ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN | has_input | hydronCHEBI:15378 |
|
ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN | has_output | diphosphoric acidCHEBI:29888 |
|
ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN | has_output | CDP-ethanolamine(1-)CHEBI:57876 |
|
ethanolamine-phosphate cytidylyltransferase activitygomodel:2.7.7.14-RXN | has_input | CTP(4-)CHEBI:37563 |
|
ethanolaminephosphotransferase activitygomodel:ETHANOLAMINEPHOSPHOTRANSFERASE-RXN | has_input | CDP-ethanolamine(1-)CHEBI:57876 |
|
ethanolamine kinase activitygomodel:ETHANOLAMINE-KINASE-RXN | part_of | glycerophospholipid biosynthetic processGO:0046474 |
|
EKI1 ScerSGD:S000002554 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095) | cytoplasmGO:0005737 |
|
EPT1 ScerSGD:S000001165 | located_in Physical protein location from reviewed UniProt. evidence code not specified by source Topology: Multi-pass membrane protein. | Golgi membraneGO:0000139 |
|
ECT1 ScerSGD:S000003239 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095) | cytoplasmGO:0005737 |
|
ECT1 ScerSGD:S000003239 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095) | nucleusGO:0005634 |
|
EPT1 ScerSGD:S000001165 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000269 (PubMed:1847919) | magnesium(2+)CHEBI:18420 |
|
References
gomodel:YeastPathways_PWY3O-259SGD GO-CAM phospholipid biosynthesis II Kennedy pathway PWY3O-259 (source version: Pinned Noctua JSON archive; model date 2024-07-15; member ./YeastPathways_PWY3O-259.json)UniProtKB:Q03764Reviewed UniProtKB Q03764 location annotations (source version: UniProt release 2026_03)UniProtKB:P22140Reviewed UniProtKB P22140 location annotations (source version: UniProt release 2026_03)UniProtKB:P33412Reviewed UniProtKB P33412 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 3 activity location assignments and 3 mapped physical proteins against reviewed S288C UniProt release2026_03 location/function/caution batch SHA256 95f72dcc644358c480e0e59f996cf88533558b5fa4256460a030e0a1eaf9678d. Added 4 independently supported location edges and quarantined 1 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