citrulline biosynthesis
gomodel:YeastPathways_CITRUL-BIO2-PWY
Citrulline biosynthesis in Saccharomyces cerevisiae S288C uses CPX-579 carbamoyl-phosphate synthase to form carbamoyl phosphate from L-glutamine, hydrogencarbonate, water, and ATP, then ARG3 ornithine carbamoyltransferase transfers the carbamoyl group to L-ornithine to form L-citrulline in the SGD GO-CAM citrulline biosynthesis pathway.
- Pathway type
- amino acid biosynthesis
- Organism scope
Pathway network
22 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 | |
L-citrulline zwitterionCHEBI:57743 | small molecule | |
hydrogenphosphateCHEBI:43474 | small molecule | |
hydrogencarbonateCHEBI:17544 | small molecule | |
ADP(3-)CHEBI:456216 | small molecule | |
waterCHEBI:15377 | small molecule | |
hydronCHEBI:15378 | small molecule | |
cytosolGO:0005829 | cellular component | |
L-citrulline biosynthetic processGO:0019240 | biological process | |
carbamoyl phosphate(2-)CHEBI:58228 | small molecule | |
CPX-579 ScerSGD:S000217863 | complex | |
ARG3 ScerSGD:S000003624 | protein | |
L-glutamate(1-)CHEBI:29985 | small molecule | |
L-glutamine zwitterionCHEBI:58359 | small molecule | |
L-ornithinium(1+)CHEBI:46911 | small molecule | |
ATP(4-)CHEBI:30616 | small molecule | |
cytoplasmGO:0005737 | cellular component | |
CPA2 ScerSGD:S000003870 | protein | |
CPA1 ScerSGD:S000005829 | protein | |
magnesium(2+)CHEBI:18420 | cofactor | |
manganese(2+)CHEBI:29035 | cofactor | |
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | molecular activity | |
L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN | molecular activity |
Mechanistic edges
| Subject | Predicate and description | Object | Evidence |
|---|---|---|---|
L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN | has_output | L-citrulline zwitterionCHEBI:57743 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_output | hydrogenphosphateCHEBI:43474 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_input | hydrogencarbonateCHEBI:17544 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_output | ADP(3-)CHEBI:456216 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_input | waterCHEBI:15377 |
|
L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN | has_output | hydrogenphosphateCHEBI:43474 |
|
L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN | has_output | hydronCHEBI:15378 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_output | hydronCHEBI:15378 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | occurs_in | cytosolGO:0005829 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | part_of | L-citrulline biosynthetic processGO:0019240 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_output | carbamoyl phosphate(2-)CHEBI:58228 |
|
CPX-579 ScerSGD:S000217863 | enables | 2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN |
|
ARG3 ScerSGD:S000003624 | enables | L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_output | L-glutamate(1-)CHEBI:29985 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_input | L-glutamine zwitterionCHEBI:58359 |
|
L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN | occurs_in | cytosolGO:0005829 |
|
L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN | has_input | L-ornithinium(1+)CHEBI:46911 |
|
2 ATP + L-glutamine + hydrogencarbonate + H2O -> L-glutamate + carbamoyl phosphate + 2 ADP + phosphate + 2 H+gomodel:CARBPSYN-RXN | has_input | ATP(4-)CHEBI:30616 |
|
L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN | has_input | carbamoyl phosphate(2-)CHEBI:58228 |
|
L-ornithine + carbamoyl phosphate -> L-citrulline + phosphate + H+gomodel:ORNCARBAMTRANSFER-RXN | part_of | L-citrulline biosynthetic processGO:0019240 |
|
CPX-579 ScerSGD:S000217863 | has_part ECO:0000353: physical interaction evidence; source stoichiometry minValue: 1, maxValue: 1 | CPA1 ScerSGD:S000005829 |
|
CPX-579 ScerSGD:S000217863 | has_part ECO:0000353: physical interaction evidence; source stoichiometry minValue: 1, maxValue: 1 | CPA2 ScerSGD:S000003870 |
|
CPX-579 ScerSGD:S000217863 | located_in Complex location from the independent composition source; original GO-CAM activity locations are retained with their own provenance. | cytoplasmGO:0005737 |
|
ARG3 ScerSGD:S000003624 | located_in Physical protein location from reviewed UniProt. evidence code not specified by source | cytoplasmGO:0005737 |
|
CPA2 ScerSGD:S000003870 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095); ECO:0000269 (PubMed:200419); ECO:0000269 (PubMed:205532) | cytoplasmGO:0005737 |
|
CPA1 ScerSGD:S000005829 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:14562095); ECO:0000269 (PubMed:200419); ECO:0000269 (PubMed:205532) | cytoplasmGO:0005737 |
|
CPA2 ScerSGD:S000003870 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000255 (PROSITE-ProRule:PRU00409) Binds 4 Mg(2+) or Mn(2+) ions per subunit. UniProt note evidence: ECO:0000255 (PROSITE-ProRule:PRU00409) | magnesium(2+)CHEBI:18420 |
|
CPA2 ScerSGD:S000003870 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000255 (PROSITE-ProRule:PRU00409) Binds 4 Mg(2+) or Mn(2+) ions per subunit. UniProt note evidence: ECO:0000255 (PROSITE-ProRule:PRU00409) | manganese(2+)CHEBI:29035 |
|
References
gomodel:YeastPathways_CITRUL-BIO2-PWYSGD GO-CAM citrulline biosynthesis - imported from: Saccharomyces Genome Database (source version: Pinned Noctua JSON archive; model date 2024-07-12; member ./YeastPathways_CITRUL-BIO2-PWY.json)SGD:S000217863Complex Portal CPX-579: Carbamoyl-phosphate synthase arginine-specific (source version: Inspected API snapshot 2026-10-05; release dates 2014-10-16)gomodel:YeastPathways_ARGSYNBSUB-PWYGO-CAM L-arginine biosynthesis II acetyl cycle model YeastPathways_ARGSYNBSUB-PWY (source version: Pinned Noctua JSON archive; model date 2026-07-08; member ./YeastPathways_ARGSYNBSUB-PWY.json)UniProtKB:P07258Reviewed UniProtKB P07258 SGD cross-reference (source version: UniProt release 2026_03)UniProtKB:P03965Reviewed UniProtKB P03965 SGD cross-reference (source version: UniProt release 2026_03)UniProtKB:P05150Reviewed UniProtKB P05150 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. Reviewed exact Complex Portal composition, source evidence grades, and independent physical complex locations.
- Codex; review-complex-composition; Reviewed exact Complex Portal composition, source evidence grades, and independent physical complex locations; reused existing proteins through reviewed UniProt SGD cross-references.
- Codex
- EDIT — Audit causal activity compartments and preserve scoped protein location evidence
Reviewed all 2 activity location assignments and 3 mapped physical proteins against reviewed S288C UniProt release2026_03 location/function/caution batch SHA256 95f72dcc644358c480e0e59f996cf88533558b5fa4256460a030e0a1eaf9678d. Added 3 independently supported location edges and quarantined 0 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