pentose phosphate pathway (non-oxidative branch) II
MetaCyc:PWY-8178
The native MetaCyc PWY-8178 boundary contains six reversible reactions: ribose-phosphate isomerase, ribulose-phosphate epimerase, two transketolase events, PPi-dependent S7P phosphorylation and sedoheptulose-bisphosphate cleavage. The displayed pentose-to-hexose layout reverses the native left/right direction of RIB5PISOM-RXN and 1TRANSKETO-RXN. RXN-21730 consumes S7P and PPi and releases SBP, phosphate and a proton; PPi is a consumed donor, not merely an activating cofactor. The source supplies twenty side occurrences but no explicit coefficient fields. Generic S7P and R5P classes, beta-D-fructofuranose6-phosphate and the source's distinct ionic identities are retained. The native PPI cross-reference to neutral diphosphoric acid conflicts with its charged native structure; no neutral-acid/anion exactMatch is asserted. Shared Rhea chemistry for the other five events does not establish a Rhea identity for the PPi-S7P event or narrow the native classes. Entamoeba histolytica 200:NIH provides historical activity-level support. The 1982 study used axenic TP-S-1 culture and partially purified native transketolase, PPi-PFK and aldolase; it did not identify a modern protein sequence, tag or oligomer. Transketolase apoenzyme requires both Mg2+ and thiamine diphosphate, with a lag when Mg is added first. Its two substrate-pair assays had apparent Km values dependent on the fixed cosubstrate: R5P0.027mM with Xu5P0.3mM, Xu5P0.23mM with R5P2mM, GAP1.60mM with F6P12mM, and E4P0.005mM with Xu5P0.1mM. The partial PFK preparation has apparent S7P Km64micromolar and PPi Km about10micromolar; the cited F6P comparator is38micromolar. Partial aldolase cleaves SBP with Km13micromolar versus FBP3micromolar and about half the FBP Vmax. Slight PFK contamination is disclosed; added triose-phosphate isomerase did not increase SBP cleavage. Reconstitution requires transketolase, PFK, aldolase and PPi with omission controls; yeast aldolase can substitute after PFK is supplied. Extract R5P consumption was8.1±1.7nmol/min/mg in four preparations, with triose0.46±0.04 and S7P0.40±0.04 per R5P, accounting for86% of substrate. These results support the route without assigning a present-day Entamoeba sequence. Reverse biosynthetic flux and retention of PPi energy were proposed, not all measured directly. Modern clostridial work separates species, strains and recombinant preparations. Thermosuccinogenes CDQ83_11320=PNT94038.1 and CDQ83_07225=PNT93300.1 are issued DSM5809 sequences; the metabolomics cultures are not silently equated to every issuing genome preparation. DSM1313 Clo1313_1876=ADU74928.1 is a separate PPi-PFK. In 2019 the pET28b constructs carried N-terminal His6 flanking a TEV site, without documented tag cleavage. Heat-treated Rosetta extracts assayed at55C gave CDQ83_11320 PPi-dependent F6P activity220±26U/mg CFE, with ATP/GTP activity not detected; CDQ83_07225 gave ATP13±1 and GTP13±5 with PPi not detected. CDQ83_10650 remained inactive in the tested heated and nonheated preparations. These are CFE measurements, not equal expression or purified kcat. CDQ83_07225 donor Km values differed: ATP0.155mM and GTP0.016mM. The 2019 Discussion mistakenly calls CDQ83_11320 PPdK; Tables2/3 identify PPdK as CDQ83_07455. The 2020 study used pET28b+/Rosetta for CDQ83 proteins and DSM1313 PCR into pD861-NT/pSH157 in E. coli T7 Express lysY/Iq for Clo1313_1876. Direct55C MS showed S7P-to-SBP conversion with PPi, alongside minus-PPi and minus-enzyme controls. The MS assay contained5mM MgCl2,5mM sodium PPi and1mM acceptor; kinetic assays used1mM PPi. Mg presence is an assay condition, not an independently measured universal metal requirement. Rabbit aldolase coupling supplies E4P/DHAP; it does not demonstrate activity of a clostridial aldolase. Unequal triose signals led to a TPI-contamination hypothesis, not a new core reaction. NADH/GPDH and other auxiliary enzymes belong to the assay, not core stoichiometry. Purified CDQ83_11320 has S7P Km0.11mM, kcat49/s and F6P0.070mM,182/s; Clo1313_1876 has S7P0.10mM,80/s and F6P0.046mM,127/s. CDQ83_07225 has no detected S7P activity through4mM and a F6P Khalf0.688mM with Hill coefficient24, not a Michaelis Km. Its ammonium requirement belongs to the ATP/F6P comparator using lyophilized rabbit aldolase/GPDH in place of ammonium-sulfate suspensions, because S7P Ba-salt precipitated BaSO4. Ultrafiltration applied to purified PFK buffer exchange, not the auxiliary enzymes; the source's NH4Cl2 formula is inconsistent. E. coli PfkA, its0.25mM ADP assay addition and delta-talAB physiology are ATP-route comparisons, not an E. coli PPi-branch assignment. The thesis-version supplemental figures reproduce the minus-enzyme control and separate Michaelis/Hill fits. Hill fits for PPi enzymes are not uniformly one; the very steep CDQ83_07225 fit and poor alternative Michaelis fit must not be confused. This thesis supplement is not asserted byte-identical to a journal supplementary PDF. Thermosuccinogenes SBP and S7P pools were about fourfold and2.5-fold higher on xylose than glucose in biological triplicates normalized to OD600. Pool accumulation does not establish six-event flux, direct xylose binding or transcriptional regulation. The 2023 study tests ATCC27405=DSM1237 Cthe_0347 Pfp=ABN51585.1 and Cthe_0349 Aldoa=ABN51587.1, distinct from DSM1313. Aldoa uses a synthetic codon-optimized pRSET-A construct with N-terminal His6/linker; Pfp uses pAHCT0347/pRSET-A with an N-terminal His6 tag. Both were expressed in E. coli T7 Shuffle. The inspected Pfp-specific passages do not establish a linker or codon optimization. Ni purification does not identify physiological nickel use. Pfp forward MS at50C used2mM PPi,2.115mM S7P and2.5mM MgCl2. Reported S7P Km3.236mM exceeds the highest measured2.12mM; Vmax is6.294±3.723micromol/min/mg. The F6P Km0.075mM and Vmax100.222±11.6 were measured separately. This preparation/strain/assay difference from the2020 values remains unresolved. Mixed S7P/F6P lowered FBP formation, consistent with competition in that assay, without a direct binding constant. Only forward S7P phosphorylation was tested. The original Taillefer thesis adds Cthe_0347 F6P-assay context. Its title page says2017, the issuing repository metadata2015-04 and the2023 citation2016; the persistent Handle identifies the retained artifact despite the date conflict. The His6 pAHCT0347/pRSET-A T7 Shuffle preparation was assayed at50C with5mM MgCl2. PPi was the sole detected donor; ATP,GTP,PEP and ADP were not detected as donors. PPi Km was0.23mM, Vmax39.7micromol/min/mg and calculated kcat30.14/s. High PPi gave substrate inhibition Ki1.38±0.5mM;1mM ATP reduced F6P-PFK activity about60%. ADP,AMP,GTP,GMP and PEP at1mM had no significant effect. These are original F6P-assay observations, not directly measured S7P inhibition or a resolved ATP-binding mechanism. The approximately50kDa SDS monomer mass is not a native oligomer measurement. The source's reference to GK protein within the PFK paragraph is retained as a wording inconsistency; effects on other thesis enzymes are outside this branch. Aldoa's direct2023 activity is FBP cleavage, Km0.145mM and Vmax27.7micromol/min/mg. The paper explicitly did not verify SBP cleavage. At55C with2mM added cations, Zn2+ increased FBP activity over twofold, Mg2+ alone was not significant, Mg2+ plus ammonium increased activity, and K+ reduced activity in the Mg/Zn comparisons. Ammonium partly attenuated the stronger Zn response, so its activation edge is restricted to the Mg-containing condition. These effects do not establish SBP-specific metal requirements. The DSM1313 Clo1313_1875=ADU74927.1 aldolase is an issuing class-II FBP annotation with promoter-binding context; neither the rabbit coupling assay nor the ATCC27405 FBP assay is transferred to an exact DSM1313 SBP catalyst. Additional RPI/RPE/TKT investigation preserves evidence levels. ATCC27405 Cthe_2597 RpiB=A3DIL8 is a149-residue unreviewed sequence with EC5.3.1.6 annotation. Issuing3HEE contains R5P and author/PISA dimer assembly;3PH3 contains unphosphorylated ribose and has a different deposited construct extent. The2011 publisher abstract reports ligand structures and mutagenesis, but its full body was unavailable. The2008 and2013 papers and2009 crystallization lead concern rare/unphosphorylated sugars; unseen body details are not converted to R5P turnover evidence. Historical ZP00503831.1 has the same149-residue sequence but older product/EC annotation, so version differences remain explicit. Crystallization salts are not a measured Mg cofactor requirement. DSM1313 Clo1313_1661=ADU74718.1 and ATCC27405 Cthe_0576=ABN51812.1 are issuing RPE annotations, without a newly acquired purified-enzyme or metal assay. A failed lexical search for DSM1313 RpiB does not establish absence. KJC335 is a DSM1313-derived delta-hpt strain carrying heterologous xylAB. The TktAB pair CLO1313_RS00385/RS00390 joins through issuing historical gene records to Clo1313_0074/0075 and ADU73172.1/ADU73173.1. Co-overexpression from the gapDH promoter on pTC131374-5 reduced doubling time on5g/L xylose from19.0±5.7h to5.8±0.6h versus pKJC84 empty vector, with no major cellobiose difference. This supports paired pathway participation, not full catalysis by each subunit or measured1:1 assembly. RNA-seq used three replicates at matched mid-exponential OD but different growth rates, which limits interpretation. Another predicted pair reported as RS01525/RS01530 changed little; the separately issued ADU73386.1/ADU73387.1 Clo1313_0295/0296 annotations are retained without silently asserting an unverified modern-locus join. Broad transport, xylitol, chemotaxis and cellulosome responses remain outside the six-event core. Rex Clo1313_2471=ADU75484.1 is issued with a generic CoA-binding-domain label; the primary study identifies Rex. DAP-seq used codon-optimized C-terminal HaloTag constructs in E. coli S30 IVTT,55C binding and a HaloTag-only control. Separate room-temperature motif EMSA used semi-purified C-terminal His6 protein from BL21(DE3); no Kd was determined. DAP-seq associates two shared sites in the divergent Clo1313_1875/1876 region, but which site acts on either gene or both is unresolved. Poor replicate correlation(Pearson0.18) and motif-versus-promoter assay scope are retained. The graph represents sequence-specific DNA binding only, without a signed expression arrow, invented live-gene endpoint or exact NADH/NAD effector dose-response. Family redox-sensing models are not direct assays of this construct. Historical Entrez12422212,12421607 and12421608 provide locus context but are not recast as currently live annotated genes. The2022 engineered LL1660 result limits necessity claims: a strain lacking PPi-PFK and introduced transaldolase could grow despite the proposed reverse biosynthetic role. A partial Clo1313_0790–1248 genome duplication includes ATP-pfk0997 and other energy genes; it does not uniquely identify the compensating mechanism. The alternate route remains unknown, with L-type PPP discussed as a possibility. This counterevidence does not negate the measured wild-type/recombinant enzyme activities. The retained publisher rendering supports these Results/Discussion claims; no supplemental reanalysis is asserted. A separate13C flux-model study is consistent with nonoxidative/SBP routing but model fits and near-equilibrium estimates are not exact enzyme assignments. Native enzyme associations are reaction-global: the16 original associations include15 excluded from transfer to the scoped organisms. The UniProtB8I4R1 cross-reference on native MetaCyc MONOMER-21313 belongs to a different species/locus, despite the native object's correct thermocellum PID ADU74928.1. B8I4R1 sequence, homodimer, cofactor and nonallosteric annotations are not transferred to DSM1313 or thermosuccinogenes. Native G-80830 has a locus/STRING cross-reference conflict. Broad Bacteria range, methylotroph substrate reports whose original bodies were not acquired, and a45-genome survey with two transaldolase-annotated R. papyrosolvens exceptions do not establish universal branch occurrence. PPi supply through glycogen cycling or proton-pumping pyrophosphatase and a metabolic relief-valve role remain proposals outside the core. Pentose assimilation, anabolic pentose supply and glycolytic F6P/GAP are interfaces; oxidative PPP/NADPH production, carbon fixation and an invented transporter are not extra core events. Unknown assemblies, locations and fine regulatory mechanisms remain unknown.
- Pathway type
- pentose phosphate pathway
- Organism scope
Pathway network
59 nodes · 51 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
- Pathway
- Solid arrow: mechanistic relation
- Dashed arrow: membership, location or cofactor relation
Components and activities
| Node | Kind or role | Source direction |
|---|---|---|
Entamoeba histolyticaNCBITaxon:5759 | taxon | |
Acetivibrio thermocellusNCBITaxon:1515 | taxon | |
Clostridium thermosuccinogenesNCBITaxon:84032 | taxon | |
Acetivibrio thermocellus ATCC 27405NCBITaxon:203119 | taxon | |
Acetivibrio thermocellus DSM 1313NCBITaxon:637887 | taxon | |
transketolaseEC:2.2.1.1 | molecular activity | |
diphosphate--fructose-6-phosphate 1-phosphotransferaseEC:2.7.1.90 | molecular activity | |
fructose-bisphosphate aldolaseEC:4.1.2.13 | molecular activity | |
ribulose-phosphate 3-epimeraseEC:5.1.3.1 | molecular activity | |
ribose-5-phosphate isomeraseEC:5.3.1.6 | molecular activity | |
D-sedoheptulose 1,7-bisphosphateMetaCyc:D-SEDOHEPTULOSE-1-7-P2 | chemical entity | |
D-sedoheptulose 7-phosphateMetaCyc:D-SEDOHEPTULOSE-7-P | chemical entity | |
glycerone phosphateMetaCyc:DIHYDROXY-ACETONE-PHOSPHATE | chemical entity | |
D-erythrose 4-phosphateMetaCyc:ERYTHROSE-4P | chemical entity | |
beta-D-fructofuranose 6-phosphateMetaCyc:FRUCTOSE-6P | chemical entity | |
D-glyceraldehyde 3-phosphateMetaCyc:GAP | chemical entity | |
diphosphateMetaCyc:PPI | chemical entity | |
H+MetaCyc:PROTON | chemical entity | |
phosphateMetaCyc:Pi | chemical entity | |
D-ribose 5-phosphateMetaCyc:RIBOSE-5P | chemical entity | |
D-ribulose 5-phosphateMetaCyc:RIBULOSE-5P | chemical entity | |
D-xylulose 5-phosphateMetaCyc:XYLULOSE-5-PHOSPHATE | chemical entity | |
phosphofructokinase [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51585.1 | protein | |
fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51587.1 | protein | |
ribulose-phosphate 3-epimerase [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51812.1 | protein | |
Transketolase domain-containing protein [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU73172.1 | protein | |
Transketolase domain-containing protein [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU73173.1 | protein | |
Transketolase domain-containing protein [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU73386.1 | protein | |
Transketolase central region [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU73387.1 | protein | |
ribulose-phosphate 3-epimerase [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU74718.1 | protein | |
fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU74927.1 | protein | |
phosphofructokinase [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU74928.1 | protein | |
CoA-binding domain protein [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU75484.1 | protein | |
6-phosphofructokinase [Clostridium thermosuccinogenes]NCBIProtein:PNT93300.1 | protein | |
6-phosphofructokinase [Clostridium thermosuccinogenes]NCBIProtein:PNT94038.1 | protein | |
Sugar-phosphate isomerase, RpiB/LacA/LacB familyUniProtKB:A3DIL8 | protein | |
magnesium(2+)CHEBI:18420 | cofactor | |
ammoniumCHEBI:28938 | chemical entity | |
potassium(1+)CHEBI:29103 | chemical entity | |
zinc(2+)CHEBI:29105 | chemical entity | |
ATP(4-)CHEBI:30616 | chemical entity | |
thiamine(1+) diphosphate(3-)CHEBI:58937 | cofactor | |
sequence-specific DNA bindingGO:0043565 | molecular activity | |
RXN-21730MetaCyc:RXN-21730 | molecular activity | reversible |
SEDOBISALDOL-RXNMetaCyc:SEDOBISALDOL-RXN | molecular activity | reversible |
1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN | molecular activity | reversible |
2TRANSKETO-RXNMetaCyc:2TRANSKETO-RXN | molecular activity | reversible |
RIB5PISOM-RXNMetaCyc:RIB5PISOM-RXN | molecular activity | reversible |
RIBULP3EPIM-RXNMetaCyc:RIBULP3EPIM-RXN | molecular activity | reversible |
Mechanistic edges
| Subject | Predicate and description | Object | Evidence |
|---|---|---|---|
D-sedoheptulose 7-phosphateMetaCyc:D-SEDOHEPTULOSE-7-P | consumes Native left contains D-SEDOHEPTULOSE-7-P; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | RXN-21730MetaCyc:RXN-21730 |
|
diphosphateMetaCyc:PPI | consumes Native left contains PPI; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | RXN-21730MetaCyc:RXN-21730 |
|
RXN-21730MetaCyc:RXN-21730 | produces Native right contains D-SEDOHEPTULOSE-1-7-P2; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | D-sedoheptulose 1,7-bisphosphateMetaCyc:D-SEDOHEPTULOSE-1-7-P2 |
|
RXN-21730MetaCyc:RXN-21730 | produces Native right contains Pi; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | phosphateMetaCyc:Pi |
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RXN-21730MetaCyc:RXN-21730 | produces Native right contains PROTON; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | H+MetaCyc:PROTON |
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D-sedoheptulose 1,7-bisphosphateMetaCyc:D-SEDOHEPTULOSE-1-7-P2 | consumes Native left contains D-SEDOHEPTULOSE-1-7-P2; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | SEDOBISALDOL-RXNMetaCyc:SEDOBISALDOL-RXN |
|
SEDOBISALDOL-RXNMetaCyc:SEDOBISALDOL-RXN | produces Native right contains DIHYDROXY-ACETONE-PHOSPHATE; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | glycerone phosphateMetaCyc:DIHYDROXY-ACETONE-PHOSPHATE |
|
SEDOBISALDOL-RXNMetaCyc:SEDOBISALDOL-RXN | produces Native right contains ERYTHROSE-4P; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | D-erythrose 4-phosphateMetaCyc:ERYTHROSE-4P |
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1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN | produces Native left contains D-SEDOHEPTULOSE-7-P; reaction-direction is REVERSIBLE. PWY-8178 layout uses right-to-left. No explicit coefficient is supplied; class status and species identity are retained. | D-sedoheptulose 7-phosphateMetaCyc:D-SEDOHEPTULOSE-7-P |
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1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN | produces Native left contains GAP; reaction-direction is REVERSIBLE. PWY-8178 layout uses right-to-left. No explicit coefficient is supplied; class status and species identity are retained. | D-glyceraldehyde 3-phosphateMetaCyc:GAP |
|
D-ribose 5-phosphateMetaCyc:RIBOSE-5P | consumes Native right contains RIBOSE-5P; reaction-direction is REVERSIBLE. PWY-8178 layout uses right-to-left. No explicit coefficient is supplied; class status and species identity are retained. | 1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN |
|
D-xylulose 5-phosphateMetaCyc:XYLULOSE-5-PHOSPHATE | consumes Native right contains XYLULOSE-5-PHOSPHATE; reaction-direction is REVERSIBLE. PWY-8178 layout uses right-to-left. No explicit coefficient is supplied; class status and species identity are retained. | 1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN |
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D-erythrose 4-phosphateMetaCyc:ERYTHROSE-4P | consumes Native left contains ERYTHROSE-4P; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | 2TRANSKETO-RXNMetaCyc:2TRANSKETO-RXN |
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D-xylulose 5-phosphateMetaCyc:XYLULOSE-5-PHOSPHATE | consumes Native left contains XYLULOSE-5-PHOSPHATE; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | 2TRANSKETO-RXNMetaCyc:2TRANSKETO-RXN |
|
2TRANSKETO-RXNMetaCyc:2TRANSKETO-RXN | produces Native right contains FRUCTOSE-6P; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | beta-D-fructofuranose 6-phosphateMetaCyc:FRUCTOSE-6P |
|
2TRANSKETO-RXNMetaCyc:2TRANSKETO-RXN | produces Native right contains GAP; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | D-glyceraldehyde 3-phosphateMetaCyc:GAP |
|
RIB5PISOM-RXNMetaCyc:RIB5PISOM-RXN | produces Native left contains RIBOSE-5P; reaction-direction is REVERSIBLE. PWY-8178 layout uses right-to-left. No explicit coefficient is supplied; class status and species identity are retained. | D-ribose 5-phosphateMetaCyc:RIBOSE-5P |
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D-ribulose 5-phosphateMetaCyc:RIBULOSE-5P | consumes Native right contains RIBULOSE-5P; reaction-direction is REVERSIBLE. PWY-8178 layout uses right-to-left. No explicit coefficient is supplied; class status and species identity are retained. | RIB5PISOM-RXNMetaCyc:RIB5PISOM-RXN |
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D-ribulose 5-phosphateMetaCyc:RIBULOSE-5P | consumes Native left contains RIBULOSE-5P; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | RIBULP3EPIM-RXNMetaCyc:RIBULP3EPIM-RXN |
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RIBULP3EPIM-RXNMetaCyc:RIBULP3EPIM-RXN | produces Native right contains XYLULOSE-5-PHOSPHATE; reaction-direction is REVERSIBLE. PWY-8178 layout uses left-to-right. No explicit coefficient is supplied; class status and species identity are retained. | D-xylulose 5-phosphateMetaCyc:XYLULOSE-5-PHOSPHATE |
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RIB5PISOM-RXNMetaCyc:RIB5PISOM-RXN | provides_input_for Native pathway ordering places RIB5PISOM-RXN before 1TRANSKETO-RXN; the shared metabolite transfers carbon within the six-event scope, without asserting isolated flux measurement. | 1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN |
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RIBULP3EPIM-RXNMetaCyc:RIBULP3EPIM-RXN | provides_input_for Native pathway ordering places RIBULP3EPIM-RXN before 1TRANSKETO-RXN; the shared metabolite transfers carbon within the six-event scope, without asserting isolated flux measurement. | 1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN |
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1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN | provides_input_for Native pathway ordering places 1TRANSKETO-RXN before RXN-21730; the shared metabolite transfers carbon within the six-event scope, without asserting isolated flux measurement. | RXN-21730MetaCyc:RXN-21730 |
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RXN-21730MetaCyc:RXN-21730 | provides_input_for Native pathway ordering places RXN-21730 before SEDOBISALDOL-RXN; the shared metabolite transfers carbon within the six-event scope, without asserting isolated flux measurement. | SEDOBISALDOL-RXNMetaCyc:SEDOBISALDOL-RXN |
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SEDOBISALDOL-RXNMetaCyc:SEDOBISALDOL-RXN | provides_input_for Native pathway ordering places SEDOBISALDOL-RXN before 2TRANSKETO-RXN; the shared metabolite transfers carbon within the six-event scope, without asserting isolated flux measurement. | 2TRANSKETO-RXNMetaCyc:2TRANSKETO-RXN |
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diphosphate--fructose-6-phosphate 1-phosphotransferaseEC:2.7.1.90 | catalyzes Partially purified Entamoeba histolytica 200:NIH PPi-PFK phosphorylates S7P. This activity endpoint does not assert a current protein sequence, oligomer or tag. | RXN-21730MetaCyc:RXN-21730 |
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fructose-bisphosphate aldolaseEC:4.1.2.13 | catalyzes Partial native Entamoeba 200:NIH aldolase cleaves SBP; apparent Km13 micromolar versus FBP3 and about half Vmax. Slight PFK contamination is retained; no sequenced protein assignment is made. | SEDOBISALDOL-RXNMetaCyc:SEDOBISALDOL-RXN |
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transketolaseEC:2.2.1.1 | catalyzes Native partial Entamoeba 200:NIH transketolase supports both substrate pairs. The EC endpoint represents measured activity, not a sequenced clostridial subunit or fabricated complex. | 1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN |
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transketolaseEC:2.2.1.1 | catalyzes Native partial Entamoeba 200:NIH transketolase supports both substrate pairs. The EC endpoint represents measured activity, not a sequenced clostridial subunit or fabricated complex. | 2TRANSKETO-RXNMetaCyc:2TRANSKETO-RXN |
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ribose-5-phosphate isomeraseEC:5.3.1.6 | catalyzes The native reversible reaction assigns this isomerase/epimerase activity; this activity-level link does not identify a biochemically assayed enzyme in every pathway taxon. | RIB5PISOM-RXNMetaCyc:RIB5PISOM-RXN |
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ribulose-phosphate 3-epimeraseEC:5.1.3.1 | catalyzes The native reversible reaction assigns this isomerase/epimerase activity; this activity-level link does not identify a biochemically assayed enzyme in every pathway taxon. | RIBULP3EPIM-RXNMetaCyc:RIBULP3EPIM-RXN |
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magnesium(2+)CHEBI:18420 | activates Entamoeba 200:NIH transketolase apoenzyme add-back requires both Mg2+ and thiamine diphosphate. Adding Mg first causes a lag; this is preparation-specific reconstitution, not a new chemical reaction side. | transketolaseEC:2.2.1.1 |
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thiamine(1+) diphosphate(3-)CHEBI:58937 | activates Entamoeba 200:NIH transketolase apoenzyme add-back requires both Mg2+ and thiamine diphosphate. Adding Mg first causes a lag; this is preparation-specific reconstitution, not a new chemical reaction side. | transketolaseEC:2.2.1.1 |
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6-phosphofructokinase [Clostridium thermosuccinogenes]NCBIProtein:PNT94038.1experimental construct: CDQ83_11320, DSM5809 sequence; pET28b+ N-terminal His6/TEV construct, E. coli Rosetta. 2020 MS at55C, 5mM MgCl2/5mM PPi/1mM S7P; distinct kinetic assay at1mM PPi. TEV cleavage not demonstrated. Qualification evidence
| catalyzes Purified PPi-PFK converts S7P to SBP with PPi; minus-PPi/minus-enzyme controls distinguish product formation. F6P kinetics and rabbit aldolase coupling are separate observations. | RXN-21730MetaCyc:RXN-21730 |
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phosphofructokinase [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU74928.1experimental construct: DSM1313 Clo1313_1876, PCR into pD861-NT/pSH157, N-terminal His construct in E. coli T7 Express lysY/Iq. 2020 MS at55C with5mM MgCl2/5mM PPi/1mM S7P; separate1mM PPi kinetic assay. Qualification evidence
| catalyzes Purified PPi-PFK converts S7P to SBP with PPi; minus-PPi/minus-enzyme controls distinguish product formation. F6P kinetics and rabbit aldolase coupling are separate observations. | RXN-21730MetaCyc:RXN-21730 |
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phosphofructokinase [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51585.1experimental construct: ATCC27405/DSM1237 Cthe_0347 pAHCT0347/pRSET-A, N-terminal His6, E. coli T7 Shuffle. Pfp-specific linker and codon-optimization details remain unresolved. The 2023 S7P-MS assay at50C is distinct from F6P competition/kinetics. No native homodimer measurement is inferred from sequence annotation. Qualification evidence
| catalyzes ATCC27405 Cthe_0347 Pfp forms SBP from S7P with PPi in the forward MS assay. Fitted S7P Km3.236mM exceeds the highest measured2.12mM; it is not averaged with DSM1313 kinetics. | RXN-21730MetaCyc:RXN-21730 |
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diphosphateMetaCyc:PPI | inhibits In the purified Cthe_0347 F6P assay, PPi substrate inhibition was fitted with Ki1.38±0.5mM. PPi is also the donor; this preparation-specific high-substrate effect is not direct S7P inhibition evidence. | phosphofructokinase [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51585.1experimental construct: Thesis Cthe_0347 pAHCT0347/pRSET-A His6 in E. coli T7 Shuffle; purified F6P-dependent PPi-PFK assay at50C with5mM MgCl2. Pfp-specific linker and codon-optimization details remain unresolved. This qualifier does not transfer the inhibitor sign to S7P phosphorylation. Qualification evidence
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ATP(4-)CHEBI:30616 | inhibits Adding1mM ATP reduced the Cthe_0347 F6P-PFK activity about60%. At1mM ADP, AMP, GTP, GMP and PEP no significant effect was reported; no direct ATP-binding site or S7P-assay sign is established. | phosphofructokinase [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51585.1experimental construct: Thesis Cthe_0347 pAHCT0347/pRSET-A His6 in E. coli T7 Shuffle; purified F6P-dependent PPi-PFK assay at50C with5mM MgCl2. Pfp-specific linker and codon-optimization details remain unresolved. This qualifier does not transfer the inhibitor sign to S7P phosphorylation. Qualification evidence
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D-sedoheptulose 7-phosphateMetaCyc:D-SEDOHEPTULOSE-7-P | inhibits Adding S7P alongside F6P reduced FBP formation in the mixed-substrate Pfp activity assay. Competition is an interpretation of the FBP activity result, not an inhibitor-binding measurement or loss of S7P catalysis. | phosphofructokinase [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51585.1experimental construct: ATCC27405/DSM1237 Cthe_0347 pAHCT0347/pRSET-A, N-terminal His6, E. coli T7 Shuffle. Pfp-specific linker and codon-optimization details remain unresolved. The 2023 S7P-MS assay at50C is distinct from F6P competition/kinetics. No native homodimer measurement is inferred from sequence annotation. Qualification evidence
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fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51587.1experimental construct: ATCC27405 Cthe_0349 pAHCT0349/pRSET-A N-terminal His6/linker, E. coli T7 Shuffle. Purified55C FBP assay; metal additions2mM. SBP cleavage was not verified; Ni purification does not identify a physiological cofactor. Qualification evidence
| enables Purified Cthe_0349 Aldoa has measured FBP aldolase activity, Km0.145mM and Vmax27.7micromol/min/mg. The Discussion explicitly says SBP aldolase activity was not verified. | fructose-bisphosphate aldolaseEC:4.1.2.13 |
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zinc(2+)CHEBI:29105 | activates In55C FBP assays,2mM Zn2+ increased recombinant Aldoa activity more than twofold over no added metal. This does not establish SBP-specific Zn dependence or an unmodified native preparation. | fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51587.1experimental construct: ATCC27405 Cthe_0349 pAHCT0349/pRSET-A N-terminal His6/linker, E. coli T7 Shuffle. Purified55C FBP assay; metal additions2mM. SBP cleavage was not verified; Ni purification does not identify a physiological cofactor. Qualification evidence
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ammoniumCHEBI:28938 | activates In the tested FBP assay, added ammonium with Mg2+ increased Aldoa activity. Ammonium partly reduced the stronger Zn response; the activation sign is conditional on the Mg-containing comparison. | fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51587.1experimental construct: ATCC27405 Cthe_0349 pAHCT0349/pRSET-A N-terminal His6/linker, E. coli T7 Shuffle. Purified55C FBP assay; metal additions2mM. SBP cleavage was not verified; Ni purification does not identify a physiological cofactor. Qualification evidence
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potassium(1+)CHEBI:29103 | inhibits Added K+ reduced Aldoa FBP activity in the Mg- or Zn-containing comparisons at2mM added ions. This is condition-specific and does not demonstrate K binding or SBP inhibition. | fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51587.1experimental construct: ATCC27405 Cthe_0349 pAHCT0349/pRSET-A N-terminal His6/linker, E. coli T7 Shuffle. Purified55C FBP assay; metal additions2mM. SBP cleavage was not verified; Ni purification does not identify a physiological cofactor. Qualification evidence
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fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU74927.1 | enables DSM1313 Clo1313_1875 is annotated class-II FBP aldolase. DAP-seq association is not a direct SBP assay, and rabbit coupling data are not transferred to this protein. | fructose-bisphosphate aldolaseEC:4.1.2.13 |
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ribulose-phosphate 3-epimerase [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU74718.1 | enables DSM1313 Clo1313_1661 is annotated ribulose-phosphate3-epimerase with EC5.1.3.1. This is issuing annotation support, not a newly acquired purified-enzyme assay or measured metal requirement. | ribulose-phosphate 3-epimeraseEC:5.1.3.1 |
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ribulose-phosphate 3-epimerase [Acetivibrio thermocellus ATCC 27405]NCBIProtein:ABN51812.1 | enables ATCC27405 Cthe_0576 is annotated ribulose-phosphate3-epimerase with EC5.1.3.1. Evidence is annotation-level; no unsupported transfer of cofactor or oligomer is made. | ribulose-phosphate 3-epimeraseEC:5.1.3.1 |
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Sugar-phosphate isomerase, RpiB/LacA/LacB familyUniProtKB:A3DIL8 | enables The unreviewed ATCC27405 Cthe_2597 entry assigns EC5.3.1.6 from submitted/automatic annotation. Its R5P-bound deposited structure supports ligand context; rare-sugar kinetic papers are not substituted for a fully inspected R5P kinetic assay. | ribose-5-phosphate isomeraseEC:5.3.1.6 |
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ammoniumCHEBI:28938 | activates In the 2020 F6P/ATP comparison, CDQ83_07225 required added ammonium with lyophilized auxiliary enzymes replacing ammonium-sulfate suspensions because S7P Ba-salt precipitated BaSO4. This does not apply to the PPi-S7P catalyst; the source NH4Cl2 formula is inconsistent. | 6-phosphofructokinase [Clostridium thermosuccinogenes]NCBIProtein:PNT93300.1experimental construct: CDQ83_07225 pET28b+/Rosetta His6/TEV construct; 55C F6P/ATP comparator. The 2020 assay used lyophilized rabbit aldolase/GPDH instead of ammonium-sulfate suspensions because S7P Ba-salt precipitated BaSO4; ammonium was added. The source NH4Cl2 formula is unresolved. Qualification evidence
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Transketolase domain-containing protein [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU73172.1experimental construct: DSM1313 TktAB subunit in KJC335-derived delta-hpt/xylAB engineered strain; pTC131374-5 co-overexpresses BOTH genes from gapDH promoter. This individual endpoint does not assert solitary transketolase activity or a1:1 assembly. Qualification evidence
| part_of KJC335-derived co-overexpression of both TktAB genes reduced xylose doubling time from19.0±5.7h to5.8±0.6h versus empty vector. This supports paired pathway participation, not isolated subunit catalysis or measured complex stoichiometry. | MetaCyc:PWY-8178 |
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Transketolase domain-containing protein [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU73173.1experimental construct: DSM1313 TktAB subunit in KJC335-derived delta-hpt/xylAB engineered strain; pTC131374-5 co-overexpresses BOTH genes from gapDH promoter. This individual endpoint does not assert solitary transketolase activity or a1:1 assembly. Qualification evidence
| part_of KJC335-derived co-overexpression of both TktAB genes reduced xylose doubling time from19.0±5.7h to5.8±0.6h versus empty vector. This supports paired pathway participation, not isolated subunit catalysis or measured complex stoichiometry. | MetaCyc:PWY-8178 |
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CoA-binding domain protein [Acetivibrio thermocellus DSM 1313]NCBIProtein:ADU75484.1experimental construct: Two distinct Rex constructs: codon-optimized C-terminal HaloTag in E. coli S30 IVTT for55C DAP-seq, and C-terminal His6 BL21(DE3) preparation for room-temperature motif EMSA. Shared1875/1876 promoter sites do not establish signed expression. Qualification evidence
| enables Rex DNA-binding assays support a sequence-specific motif. DAP-seq associates two shared divergent-region sites with Clo1313_1875/1876, but site-to-gene assignment and expression sign remain unresolved; motif EMSA is not a promoter-specific regulation assay. | sequence-specific DNA bindingGO:0043565 |
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References
PMID:31871051The pentose phosphate pathway of cellulolytic clostridia relies on 6-phosphofructokinase instead of transaldolase (source version: Retained original JATS; claim selectors and bounded reading scope in author dossier; supplementary bodies separately assessed)PMID:31178853Assessing Cofactor Usage in Pseudoclostridium thermosuccinogenes via Heterologous Expression of Central Metabolic Enzymes (source version: Retained original JATS; claim selectors and bounded reading scope in author dossier; supplementary bodies separately assessed)PMID:34566906Genome-Wide Transcription Factor DNA Binding Sites and Gene Regulatory Networks in Clostridium thermocellum (source version: Retained original JATS; claim selectors and bounded reading scope in author dossier; supplementary bodies separately assessed)PMID:37438781Kinetic characterization of annotated glycolytic enzymes present in cellulose-fermenting Clostridium thermocellum suggests different metabolic roles (source version: Retained original JATS; claim selectors and bounded reading scope in author dossier; supplementary bodies separately assessed)PMID:32884054Transcriptomic analysis of a Clostridium thermocellum strain engineered to utilize xylose: responses to xylose versus cellobiose feeding (source version: Retained original JATS; claim selectors and bounded reading scope in author dossier; supplementary bodies separately assessed)PMID:32184362In Vivo Thermodynamic Analysis of Glycolysis in Clostridium thermocellum and Thermoanaerobacterium saccharolyticum Using 13 C and 2 H Tracers (source version: Retained original JATS; claim selectors and bounded reading scope in author dossier; supplementary bodies separately assessed)MetaCyc:D-SEDOHEPTULOSE-1-7-P2D-sedoheptulose 1,7-bisphosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:D-SEDOHEPTULOSE-7-PD-sedoheptulose 7-phosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:DIHYDROXY-ACETONE-PHOSPHATEglycerone phosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:ERYTHROSE-4PD-erythrose 4-phosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:FRUCTOSE-6Pbeta-D-fructofuranose 6-phosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:GAPD-glyceraldehyde 3-phosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:PPIdiphosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:PROTONH+: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:Piphosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:RIBOSE-5PD-ribose 5-phosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:RIBULOSE-5PD-ribulose 5-phosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:XYLULOSE-5-PHOSPHATED-xylulose 5-phosphate: issuing native definition (source version: MetaCyc 27.0; retrieved 2026-10-12)MetaCyc:PWY-8178Pentose phosphate pathway (non-oxidative branch) II: native full six-reaction definition (source version: MetaCyc 27.0; original XML; HTML authority label bound separately)MetaCyc:RXN-21730MetaCyc:RXN-21730: native reversible reaction (source version: MetaCyc 27.0; class-valued sides retained; coefficients absent)MetaCyc:SEDOBISALDOL-RXNMetaCyc:SEDOBISALDOL-RXN: native reversible reaction (source version: MetaCyc 27.0; class-valued sides retained; coefficients absent)MetaCyc:1TRANSKETO-RXNMetaCyc:1TRANSKETO-RXN: native reversible reaction (source version: MetaCyc 27.0; class-valued sides retained; coefficients absent)MetaCyc:2TRANSKETO-RXNMetaCyc:2TRANSKETO-RXN: native reversible reaction (source version: MetaCyc 27.0; class-valued sides retained; coefficients absent)MetaCyc:RIB5PISOM-RXNMetaCyc:RIB5PISOM-RXN: native reversible reaction (source version: MetaCyc 27.0; class-valued sides retained; coefficients absent)MetaCyc:RIBULP3EPIM-RXNMetaCyc:RIBULP3EPIM-RXN: native reversible reaction (source version: MetaCyc 27.0; class-valued sides retained; coefficients absent)NCBIProtein:ADU74928.1phosphofructokinase [Acetivibrio thermocellus DSM 1313]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ADU75484.1CoA-binding domain protein [Acetivibrio thermocellus DSM 1313]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ADU74927.1fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus DSM 1313]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:PNT94038.16-phosphofructokinase [Clostridium thermosuccinogenes]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:PNT93300.16-phosphofructokinase [Clostridium thermosuccinogenes]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ADU74718.1ribulose-phosphate 3-epimerase [Acetivibrio thermocellus DSM 1313]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ADU73387.1Transketolase central region [Acetivibrio thermocellus DSM 1313]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ADU73386.1Transketolase domain-containing protein [Acetivibrio thermocellus DSM 1313]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ADU73173.1Transketolase domain-containing protein [Acetivibrio thermocellus DSM 1313]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ADU73172.1Transketolase domain-containing protein [Acetivibrio thermocellus DSM 1313]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ABN51812.1ribulose-phosphate 3-epimerase [Acetivibrio thermocellus ATCC 27405]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ABN51587.1fructose-1,6-bisphosphate aldolase, class II [Acetivibrio thermocellus ATCC 27405]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)NCBIProtein:ABN51585.1phosphofructokinase [Acetivibrio thermocellus ATCC 27405]: issuing native definition (source version: Native GenBank originals retrieved 2026-10-12)UniProtKB:A3DIL8Sugar-phosphate isomerase, RpiB/LacA/LacB family: issuing native definition (source version: UniProt entry 103; annotation 2026-09-02; sequence version 1)EC:2.2.1.1transketolase: issuing native definition (source version: 2026-09-02)EC:2.7.1.90diphosphate--fructose-6-phosphate 1-phosphotransferase: issuing native definition (source version: 2026-09-02)EC:4.1.2.13fructose-bisphosphate aldolase: issuing native definition (source version: 2026-09-02)EC:5.1.3.1ribulose-phosphate 3-epimerase: issuing native definition (source version: 2026-09-02)EC:5.3.1.6ribose-5-phosphate isomerase: issuing native definition (source version: 2026-09-02)PMID:6180735A pathway for the interconversion of hexose and pentose in the parasitic amoeba Entamoeba histolytica (source version: 1982 original printed pp.191–196, six retained page scans; all visually read; no modern sequence assignment)hdl:1993/32279Characterization of the Cofactor Utilisation and Regulation of Key Enzymes in Central Catabolism in Ruminiclostridium thermocellum (source version: Native thesis PDF title page 2017; repository metadata 2015-04 and 2023 citation 2016 conflict; Chapter 4 original Methods/Results read)DOI:10.18174/510683WUR thesis containing the 2020 PPi-S7P study and kinetic supplementary figures (source version: Original PDF pp.137–141 (printed135–139) visually read; thesis-version supplement, not asserted identical to journal supplement)PMID:36286488Increasing the Thermodynamic Driving Force of the Phosphofructokinase Reaction in Clostridium thermocellum (source version: Retained publisher rendering lines170–323; relevant results/discussion inspected; original local PMC response was CAPTCHA; no supplementary reanalysis)PMID:21253719Crystal structure of Clostridium thermocellum ribose-5-phosphate isomerase B reveals properties critical for fast enzyme kinetics (source version: Publisher abstract/references available; full body unavailable; RCSB original structures separately bound, no unseen full-text assay claims)PMID:23875675Concerted proton transfer mechanism of Clostridium thermocellum ribose-5-phosphate isomerase. (source version: Indexed primary abstract only; full article not acquired; rare/unphosphorylated-sugar scope or computational context, not a direct R5P kinetic assay)PMID:18984017Novel substrates of a ribose-5-phosphate isomerase from Clostridium thermocellum. (source version: Indexed primary abstract only; full article not acquired; rare/unphosphorylated-sugar scope or computational context, not a direct R5P kinetic assay)DOI:10.2210/pdb3HEE/pdbRCSB PDB 3HEE: issuing deposited RpiB structure (source version: Original PDBx/mmCIF; deposited construct, ligand and author/PISA assembly fields)DOI:10.2210/pdb3PH3/pdbRCSB PDB 3PH3: issuing deposited RpiB structure (source version: Original PDBx/mmCIF; deposited construct, ligand and author/PISA assembly fields)
Curation history
- codex; created; External scientific authoring draft from exact native six-event pathway and inspected primary originals; independent review and maintained integration pending.
- codex
- CREATE — Add the PPi-dependent non-oxidative pentose phosphate pathway
Adopt the independently reviewed MetaCyc:PWY-8178 record, exact SHA-256 20541f677f9228b670aac99a94e4d19ef89b5c20e0f6fdbb288d18ec7a9d98f5, with six core events, 20 chemical sides, 51 mechanistic edges, 14 endpoint qualifiers, 120 evidence uses and 53 references. Preserve the PPi-dependent route and organism, enzyme, assay, cofactor and source limits assessed in the retained original and successor scientific reviews. Accepted corrections for issues 455–459 are retained with exact predecessor lineage in research/pathway_additions/2026-10-12-next-231. Adopt the four actual native authority outputs and 24 whole source originals after binding all 231 prior records to actual merged ATP commit a33f81ebed11cc61880aa645e4d5b73bb8480435. The independently re-audited preparation corrects issue 463 by binding old source-cache file types, literal links and resolved destinations as well as bytes. Record and implementation adoption guards passed; native maintained rendering, full validation/tests/lint, preservation, page QA, saved review and PR publication are subsequent steps, not outcomes claimed by this pre-render event.
- CREATE — Add the PPi-dependent non-oxidative pentose phosphate pathway