thiamine biosynthesis
gomodel:YeastPathways_PWY3O-17
Thiamine biosynthesis in Saccharomyces cerevisiae S288C builds the pyrimidine and thiazole branches, condenses 4-amino-2-methyl-5-diphosphonatooxymethylpyrimidine and 4-methyl-5-(2-phosphonatooxyethyl)thiazole to thiamine monophosphate, and dephosphorylates and diphosphorylates it to thiamine diphosphate.
- Pathway type
- cofactor biosynthesis
- Organism scope
Pathway network
46 nodes · 95 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
- Other participant
- 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 | |
adenosine 5'-monophosphate(2-)CHEBI:456215 | small molecule | |
thiamine biosynthetic processGO:0009228 | biological process | |
ADP(3-)CHEBI:456216 | small molecule | |
THI21 ScerSGD:S000006179 | protein | |
4-methyl-5-(2-phosphonatooxyethyl)thiazole(2-)CHEBI:58296 | small molecule | |
thiamine(1+) monophosphate(2-)CHEBI:37575 | small molecule | |
ADP-5-ethyl-4-methylthiazole-2-carboxylate(3-)CHEBI:139151 | small molecule | |
THI20 ScerSGD:S000005416 | protein | |
4-amino-5-hydroxymethyl-2-methylpyrimidineCHEBI:16892 | small molecule | |
hydrogenphosphateCHEBI:43474 | small molecule | |
waterCHEBI:15377 | small molecule | |
nicotinamideCHEBI:17154 | small molecule | |
ATP(4-)CHEBI:30616 | small molecule | |
thiamine(1+)CHEBI:18385 | small molecule | |
PHO3 ScerSGD:S000000296 | protein | |
carbon dioxideCHEBI:16526 | small molecule | |
cytosolGO:0005829 | cellular component | |
diphosphoric acidCHEBI:29888 | small molecule | |
thiamine(1+) diphosphate(3-)CHEBI:58937 | small molecule | |
hydronCHEBI:15378 | small molecule | |
4-amino-2-methyl-5-diphosphonatooxymethylpyrimidine(3-)CHEBI:57841 | small molecule | |
THI80 ScerSGD:S000005669 | protein | |
4-amino-2-methyl-5-phosphonatooxymethylpyrimidine(2-)CHEBI:58354 | small molecule | |
THI4 ScerSGD:S000003376 | protein | |
NAD(1-)CHEBI:57540 | small molecule | |
THI6 ScerSGD:S000006135 | protein | |
glycine zwitterionCHEBI:57305 | small molecule | |
THI13 ScerSGD:S000002403 | protein | |
cytoplasmGO:0005737 | cellular component | |
nucleusGO:0005634 | cellular component | |
N(6)-(pyridoxal phosphate)-L-lysine(2-) residueCHEBI:143915 | participant | |
L-histidine residueCHEBI:29979 | participant | |
L-cysteine residueCHEBI:29950 | participant | |
dehydroalanine residueCHEBI:90873 | participant | |
iron cationCHEBI:24875 | cofactor | |
magnesium(2+)CHEBI:18420 | cofactor | |
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | molecular activity | |
phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN | molecular activity | |
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | molecular activity | |
4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 | molecular activity | |
thiamine phosphate phosphatase activitygomodel:RXNQT-4191 | molecular activity | |
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | molecular activity | |
thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | molecular activity | |
thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN | molecular activity | |
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | molecular activity | |
phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 | molecular activity |
Mechanistic edges
| Subject | Predicate and description | Object | Evidence |
|---|---|---|---|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | has_output Native model bridge from ADP-thiazole to thiazole phosphate; the physiological enzyme assignment remains unresolved. THI4 is not assigned to this hydrolysis/decarboxylation step. | adenosine 5'-monophosphate(2-)CHEBI:456215 |
|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | part_of | thiamine biosynthetic processGO:0009228 |
|
phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN | has_output | ADP(3-)CHEBI:456216 |
|
THI21 ScerSGD:S000006179 | enables | hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 |
|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | has_output Native model bridge from ADP-thiazole to thiazole phosphate; the physiological enzyme assignment remains unresolved. THI4 is not assigned to this hydrolysis/decarboxylation step. | 4-methyl-5-(2-phosphonatooxyethyl)thiazole(2-)CHEBI:58296 |
|
thiamine phosphate phosphatase activitygomodel:RXNQT-4191 | has_input | thiamine(1+) monophosphate(2-)CHEBI:37575 |
|
phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 | has_output | ADP(3-)CHEBI:456216 |
|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | has_input Native model bridge from ADP-thiazole to thiazole phosphate; the physiological enzyme assignment remains unresolved. THI4 is not assigned to this hydrolysis/decarboxylation step. | ADP-5-ethyl-4-methylthiazole-2-carboxylate(3-)CHEBI:139151 |
|
THI20 ScerSGD:S000005416 | enables | phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | has_input | 4-amino-5-hydroxymethyl-2-methylpyrimidineCHEBI:16892 |
|
thiamine phosphate phosphatase activitygomodel:RXNQT-4191 | has_output | hydrogenphosphateCHEBI:43474 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | part_of | thiamine biosynthetic processGO:0009228 |
|
thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | part_of | thiamine biosynthetic processGO:0009228 |
|
thiamine phosphate phosphatase activitygomodel:RXNQT-4191 | has_input | waterCHEBI:15377 |
|
thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN | part_of | thiamine biosynthetic processGO:0009228 |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | has_input | ATP(4-)CHEBI:30616 |
|
thiamine phosphate phosphatase activitygomodel:RXNQT-4191 | has_output | thiamine(1+)CHEBI:18385 |
|
PHO3 ScerSGD:S000000296 | enables | thiamine phosphate phosphatase activitygomodel:RXNQT-4191 |
|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | has_output Native model bridge from ADP-thiazole to thiazole phosphate; the physiological enzyme assignment remains unresolved. THI4 is not assigned to this hydrolysis/decarboxylation step. | carbon dioxideCHEBI:16526 |
|
4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 | occurs_in | cytosolGO:0005829 |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | provides_input_for | phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 |
|
phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN | has_input | ATP(4-)CHEBI:30616 |
|
thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN | occurs_in | cytosolGO:0005829 |
|
thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | has_output | diphosphoric acidCHEBI:29888 |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | has_output | ADP(3-)CHEBI:456216 |
|
thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | occurs_in | cytosolGO:0005829 |
|
thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN | has_output | thiamine(1+) diphosphate(3-)CHEBI:58937 |
|
thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | has_input | hydronCHEBI:15378 |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | has_output | ADP(3-)CHEBI:456216 |
|
phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN | occurs_in | cytosolGO:0005829 |
|
thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN | has_input | thiamine(1+)CHEBI:18385 |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | has_output | hydronCHEBI:15378 |
|
THI21 ScerSGD:S000006179 | enables | phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 |
|
thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | has_input | 4-methyl-5-(2-phosphonatooxyethyl)thiazole(2-)CHEBI:58296 |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | has_input | ATP(4-)CHEBI:30616 |
|
phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 | has_output | 4-amino-2-methyl-5-diphosphonatooxymethylpyrimidine(3-)CHEBI:57841 |
|
phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 | has_input | ATP(4-)CHEBI:30616 |
|
THI80 ScerSGD:S000005669 | enables | thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN |
|
thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN | has_output | adenosine 5'-monophosphate(2-)CHEBI:456215 |
|
4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 | part_of | thiamine biosynthetic processGO:0009228 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | occurs_in | cytosolGO:0005829 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | provides_input_for | ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | occurs_in | cytosolGO:0005829 |
|
thiamine phosphate phosphatase activitygomodel:RXNQT-4191 | part_of | thiamine biosynthetic processGO:0009228 |
|
phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 | occurs_in | cytosolGO:0005829 |
|
phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN | has_input | 4-amino-2-methyl-5-phosphonatooxymethylpyrimidine(2-)CHEBI:58354 |
|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | occurs_in | cytosolGO:0005829 |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | has_output | 4-amino-2-methyl-5-phosphonatooxymethylpyrimidine(2-)CHEBI:58354 |
|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | has_output Native model bridge from ADP-thiazole to thiazole phosphate; the physiological enzyme assignment remains unresolved. THI4 is not assigned to this hydrolysis/decarboxylation step. | hydronCHEBI:15378 |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | has_output | hydronCHEBI:15378 |
|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | provides_input_for | thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN |
|
phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 | provides_input_for | thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | occurs_in | cytosolGO:0005829 |
|
thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN | has_input | ATP(4-)CHEBI:30616 |
|
thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN | has_output | hydronCHEBI:15378 |
|
thiamine phosphate phosphatase activitygomodel:RXNQT-4191 | provides_input_for | thiamine diphosphokinase activitygomodel:THIAMIN-PYROPHOSPHOKINASE-RXN |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | part_of | thiamine biosynthetic processGO:0009228 |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | has_output | 4-amino-2-methyl-5-phosphonatooxymethylpyrimidine(2-)CHEBI:58354 |
|
phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN | provides_input_for | thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | part_of | thiamine biosynthetic processGO:0009228 |
|
THI6 ScerSGD:S000006135 | enables | thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN |
|
phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN | has_output | 4-amino-2-methyl-5-diphosphonatooxymethylpyrimidine(3-)CHEBI:57841 |
|
phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 | part_of | thiamine biosynthetic processGO:0009228 |
|
thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | has_output | thiamine(1+) monophosphate(2-)CHEBI:37575 |
|
ADP-5-ethyl-4-methylthiazole-2-carboxylate + H2O -> AMP + 4-methyl-5-(2-phosphooxyethyl)thiazole + CO2 + H+gomodel:RXNQT-4301 | has_input Native model bridge from ADP-thiazole to thiazole phosphate; the physiological enzyme assignment remains unresolved. THI4 is not assigned to this hydrolysis/decarboxylation step. | waterCHEBI:15377 |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | provides_input_for | phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN |
|
THI20 ScerSGD:S000005416 | enables | hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | provides_input_for | phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 |
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thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | has_input | 4-amino-2-methyl-5-diphosphonatooxymethylpyrimidine(3-)CHEBI:57841 |
|
phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 | has_input | 4-amino-2-methyl-5-phosphonatooxymethylpyrimidine(2-)CHEBI:58354 |
|
hydroxymethylpyrimidine kinase activitygomodel:OHMETPYRKIN-RXN | has_input | 4-amino-5-hydroxymethyl-2-methylpyrimidineCHEBI:16892 |
|
THI4 ScerSGD:S000003376 | enables | cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 |
|
phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN | part_of | thiamine biosynthetic processGO:0009228 |
|
thiamine phosphate phosphatase activitygomodel:RXNQT-4191 | occurs_in | cytosolGO:0005829 |
|
hydroxymethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007660 | provides_input_for | phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN |
|
THI13 ScerSGD:S000002403 | enables Single-turnover THI13 chemistry inferred by similarity to THI5 (ECO:0000250, UniProtKB:P43534). Histidine and PLP-lysine are protein-bound residues, not free histidine substrates. HMP-phosphate is the product. The inherited exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions are quarantined: PMID:35675507 reports Fe(II)/oxygen dependence and different PLP-derived products for Candida albicans THI5, and a histidine-derived alpha-ketoacid for both Candida THI5 and S. cerevisiae THI5. These homolog experiments are not direct evidence for S. cerevisiae THI13; no replacement oxygen or product edges, or complete net stoichiometry, are inferred. Omitted products and balancing species remain unresolved, rather than asserted absent. | 4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 |
|
thiamine-phosphate diphosphorylase activitygomodel:THI-P-SYN-RXN | provides_input_for | thiamine phosphate phosphatase activitygomodel:RXNQT-4191 |
|
THI4 ScerSGD:S000003376 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:15544818); ECO:0000269 (PubMed:16850348) Source qualification: Excluded from the vacuole | cytoplasmGO:0005737 |
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THI4 ScerSGD:S000003376 | located_in Physical protein location from reviewed UniProt. ECO:0000269 (PubMed:16850348) Source qualification: Excluded from the vacuole | nucleusGO:0005634 |
|
4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 | has_input Single-turnover THI13 chemistry inferred by similarity to THI5 (ECO:0000250, UniProtKB:P43534). Histidine and PLP-lysine are protein-bound residues, not free histidine substrates. HMP-phosphate is the product. The inherited exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions are quarantined: PMID:35675507 reports Fe(II)/oxygen dependence and different PLP-derived products for Candida albicans THI5, and a histidine-derived alpha-ketoacid for both Candida THI5 and S. cerevisiae THI5. These homolog experiments are not direct evidence for S. cerevisiae THI13; no replacement oxygen or product edges, or complete net stoichiometry, are inferred. Omitted products and balancing species remain unresolved, rather than asserted absent. | N(6)-(pyridoxal phosphate)-L-lysine(2-) residueCHEBI:143915 |
|
4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 | has_input Single-turnover THI13 chemistry inferred by similarity to THI5 (ECO:0000250, UniProtKB:P43534). Histidine and PLP-lysine are protein-bound residues, not free histidine substrates. HMP-phosphate is the product. The inherited exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions are quarantined: PMID:35675507 reports Fe(II)/oxygen dependence and different PLP-derived products for Candida albicans THI5, and a histidine-derived alpha-ketoacid for both Candida THI5 and S. cerevisiae THI5. These homolog experiments are not direct evidence for S. cerevisiae THI13; no replacement oxygen or product edges, or complete net stoichiometry, are inferred. Omitted products and balancing species remain unresolved, rather than asserted absent. | L-histidine residueCHEBI:29979 |
|
4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 | has_output Single-turnover THI13 chemistry inferred by similarity to THI5 (ECO:0000250, UniProtKB:P43534). Histidine and PLP-lysine are protein-bound residues, not free histidine substrates. HMP-phosphate is the product. The inherited exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions are quarantined: PMID:35675507 reports Fe(II)/oxygen dependence and different PLP-derived products for Candida albicans THI5, and a histidine-derived alpha-ketoacid for both Candida THI5 and S. cerevisiae THI5. These homolog experiments are not direct evidence for S. cerevisiae THI13; no replacement oxygen or product edges, or complete net stoichiometry, are inferred. Omitted products and balancing species remain unresolved, rather than asserted absent. | 4-amino-2-methyl-5-phosphonatooxymethylpyrimidine(2-)CHEBI:58354 |
|
4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 | provides_input_for Single-turnover THI13 chemistry inferred by similarity to THI5 (ECO:0000250, UniProtKB:P43534). Histidine and PLP-lysine are protein-bound residues, not free histidine substrates. HMP-phosphate is the product. The inherited exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions are quarantined: PMID:35675507 reports Fe(II)/oxygen dependence and different PLP-derived products for Candida albicans THI5, and a histidine-derived alpha-ketoacid for both Candida THI5 and S. cerevisiae THI5. These homolog experiments are not direct evidence for S. cerevisiae THI13; no replacement oxygen or product edges, or complete net stoichiometry, are inferred. Omitted products and balancing species remain unresolved, rather than asserted absent. | phosphomethylpyrimidine kinase activitygomodel:PYRIMSYN3-RXN |
|
4-amino-5-hydroxymethyl-2-methylpyrimidine phosphate synthase activity from histidine and PLPgomodel:RXN3O-9804 | provides_input_for Single-turnover THI13 chemistry inferred by similarity to THI5 (ECO:0000250, UniProtKB:P43534). Histidine and PLP-lysine are protein-bound residues, not free histidine substrates. HMP-phosphate is the product. The inherited exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions are quarantined: PMID:35675507 reports Fe(II)/oxygen dependence and different PLP-derived products for Candida albicans THI5, and a histidine-derived alpha-ketoacid for both Candida THI5 and S. cerevisiae THI5. These homolog experiments are not direct evidence for S. cerevisiae THI13; no replacement oxygen or product edges, or complete net stoichiometry, are inferred. Omitted products and balancing species remain unresolved, rather than asserted absent. | phosphomethylpyrimidine kinase activitygomodel:YeastPathways_PWY3O-17/6a4c244800007677 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | has_input THI4 forms ADP-thiazole using its own cysteine residue as sulfur donor, leaving a dehydroalanine residue after one turnover. The reviewed equation produces three waters and two H+; it does not identify THI4 as the enzyme for downstream ADP-thiazole hydrolysis. | L-cysteine residueCHEBI:29950 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | has_input THI4 forms ADP-thiazole using its own cysteine residue as sulfur donor, leaving a dehydroalanine residue after one turnover. The reviewed equation produces three waters and two H+; it does not identify THI4 as the enzyme for downstream ADP-thiazole hydrolysis. | glycine zwitterionCHEBI:57305 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | has_input THI4 forms ADP-thiazole using its own cysteine residue as sulfur donor, leaving a dehydroalanine residue after one turnover. The reviewed equation produces three waters and two H+; it does not identify THI4 as the enzyme for downstream ADP-thiazole hydrolysis. | NAD(1-)CHEBI:57540 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | has_output THI4 forms ADP-thiazole using its own cysteine residue as sulfur donor, leaving a dehydroalanine residue after one turnover. The reviewed equation produces three waters and two H+; it does not identify THI4 as the enzyme for downstream ADP-thiazole hydrolysis. | dehydroalanine residueCHEBI:90873 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | has_output THI4 forms ADP-thiazole using its own cysteine residue as sulfur donor, leaving a dehydroalanine residue after one turnover. The reviewed equation produces three waters and two H+; it does not identify THI4 as the enzyme for downstream ADP-thiazole hydrolysis. | ADP-5-ethyl-4-methylthiazole-2-carboxylate(3-)CHEBI:139151 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | has_output THI4 forms ADP-thiazole using its own cysteine residue as sulfur donor, leaving a dehydroalanine residue after one turnover. The reviewed equation produces three waters and two H+; it does not identify THI4 as the enzyme for downstream ADP-thiazole hydrolysis. | nicotinamideCHEBI:17154 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | has_output THI4 forms ADP-thiazole using its own cysteine residue as sulfur donor, leaving a dehydroalanine residue after one turnover. The reviewed equation produces three waters and two H+; it does not identify THI4 as the enzyme for downstream ADP-thiazole hydrolysis. | waterCHEBI:15377 |
|
cysteine-dependent adenosine diphosphate thiazole synthase activitygomodel:RXN3O-401 | has_output THI4 forms ADP-thiazole using its own cysteine residue as sulfur donor, leaving a dehydroalanine residue after one turnover. The reviewed equation produces three waters and two H+; it does not identify THI4 as the enzyme for downstream ADP-thiazole hydrolysis. | hydronCHEBI:15378 |
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THI4 ScerSGD:S000003376 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000269 (PubMed:22031445) Binds 1 Fe cation per subunit. UniProt note evidence: ECO:0000269 (PubMed:22031445) | iron cationCHEBI:24875 |
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THI6 ScerSGD:S000006135 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 Binds 1 Mg(2+) ion per subunit. UniProt note evidence: ECO:0000250 | magnesium(2+)CHEBI:18420 |
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THI13 ScerSGD:S000002403 | has_cofactor UniProtKB reviewed (Swiss-Prot) annotation. UniProt evidence: ECO:0000250 (UniProtKB:P43534) | iron cationCHEBI:24875 |
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References
gomodel:YeastPathways_PWY3O-17SGD GO-CAM thiamine biosynthesis pathway PWY3O-17 (source version: Pinned Noctua JSON archive; model date 2026-07-23; member ./YeastPathways_PWY3O-17.json)UniProtKB:P32318Reviewed UniProtKB P32318 location annotations (source version: UniProt release 2026_03)UniProtKB:Q07748Reviewed UniProt Q07748: bounded catalytic-function review (source version: 2026_03)UniProtKB:P41835UniProtKB P41835 cofactor annotations (source version: 2026_03)PMID:35675507Mechanistic Studies on the Single-Turnover Yeast Thiamin Pyrimidine Synthase: Characterization of the Inactive Enzyme
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; review-catalytic-function; Reconciled native GO-CAM chemistry with independently reviewed enzyme specificity, direction, physiological scope and source cautions; superseded facts remain in the function review ledger.
- Codex; adversarial-scientific-correction; Quarantined THI13 exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions after PMID:35675507 homolog-source conflict review. Retained the protein-bound PLP-lysine/histidine to HMP-phosphate core as a similarity inference; omitted products and balancing species remain unresolved. Original endpoints and source equation are preserved in the scientific correction ledger.
- Codex
- EDIT — Audit causal activity compartments and preserve scoped protein location evidence
Reviewed all 10 activity location assignments and 7 mapped physical proteins against reviewed S288C UniProt release2026_03 location/function/caution batch SHA256 95f72dcc644358c480e0e59f996cf88533558b5fa4256460a030e0a1eaf9678d. Added 2 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
- Codex
- EDIT — Quarantined THI13 exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions after PMID:35675507 homolog-source conflict review. Retained the protein-bound PLP-lysine/histidine to HMP-phosphate core as a similarity inference; omitted products and balancing species remain unresolved. Original endpoints and source equation are preserved in the scientific correction ledger.
Quarantined THI13 exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions after PMID:35675507 homolog-source conflict review. Retained the protein-bound PLP-lysine/histidine to HMP-phosphate core as a similarity inference; omitted products and balancing species remain unresolved. Original endpoints and source equation are preserved in the scientific correction ledger. Original source assertions and review scope are preserved in reports/causal_graph_review/adversarial-scientific-corrections.json. Validated the changed record against the closed schema and added focused regression checks; repository-wide validation and generated artifacts are handled in the integration step.
- EDIT — Quarantined THI13 exact iron redox, water/proton balance, 3-oxopropanoate and residue-product assertions after PMID:35675507 homolog-source conflict review. Retained the protein-bound PLP-lysine/histidine to HMP-phosphate core as a similarity inference; omitted products and balancing species remain unresolved. Original endpoints and source equation are preserved in the scientific correction ledger.