An ethanol-fed, hexanoic-acid-producing synthetic community constructed from Chinese baijiu fermentation pit mud using a top-down strategy. The G4 SynCom was dominated by Clostridium sensu stricto 12, described as primarily Clostridium kluyveri with an 86% value, with Clostridium sensu stricto 18 and Pseudoclavibacter also reported among dominant prokaryotes. Functional predictions and fermentation profiling suggested a potential association between G4 hexanoic acid production and reverse beta-oxidation; under optimized pH 7.9, 37.6 C, 8.2% inoculum, and 77% loading-volume conditions, SynCom G4 reached 4.69 g/L hexanoic acid.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
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| Clostridium kluyveri | NCBITaxon:1534 · TaxonMech · TraitMech | DOMINANT | |
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| Pseudoclavibacter | NCBITaxon:255204 · TaxonMech · TraitMech | ABUNDANT | |
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Ecological Interactions
The graph shows only explicitly linked interaction participants. Community members without an asserted participant link are omitted; membership alone does not imply an interaction.
G4 SynCom Reverse Beta-Oxidation Association
Functional prediction and fermentation profiling associated hexanoic acid production by SynCom G4 with the reverse beta-oxidation pathway; the abstract does not resolve the complete organism-level pathway wiring.
Metabolites: ethanol (CHEBI:16236 · MediaIngredientMech · CMMMech), hexanoic acid (CHEBI:30776 · MediaIngredientMech · CMMMech)
Biological Processes:
- fermentation (GO:0006113 · PathwayMech)
Evidence
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PMID:42442429 - SUPPORT (COMPUTATIONAL)"Functional predictions and fermentation profiling suggested a potential associationbetween HA production by SynCom (G4) and the reverse β-oxidation pathway."
Knowledge gaps & discussions (2)
KNOWLEDGE_GAP OPEN Which exact NCBITaxon-resolvable organism or sequence variant corresponds to the dominant Clostridium sensu stricto 18 signal in the G4 hexanoic-acid SynCom?
The PubMed abstract names Clostridium sensu stricto 18 as a dominant G4 taxon, but OAK/OLS did not resolve that SILVA-style lineage as an NCBITaxon label on 2026-09-13. The full text, supplements, or deposited amplicon sequence table are needed before that lineage can be grounded without over-broadly mapping it to NCBI Clostridium.
Attaches to: taxonomy
1 evidence item(s)
Clostridium sensu stricto 12 (primarily Clostridium kluyveri, 86%), Clostridium sensu stricto 18 and Pseudoclavibacter
Names Clostridium sensu stricto 18 as a dominant lineage in the G4 SynCom.
KNOWLEDGE_GAP OPEN What full medium composition, enrichment transfers, and vessel geometry produced G4 from Chinese baijiu pit mud?
The PubMed abstract gives the ethanol-based source, the top-down strategy, the optimized pH, temperature, inoculum and loading volume, and the final hexanoic acid yield, but not enough method-level detail to curate a growth_media or cultivation_setup block.
Attaches to: engineering_design, environmental_factors#Optimized G4 process condition
1 evidence item(s)
Under optimized conditions (pH 7.9, 37.6°C, 8.2% inoculum, 77% loading volume), SynCom (G4) achieved a HA yield of 4.69 g/L.
Captures the abstract's quantitative optimized condition while leaving full cultivation details open.
External Resources
| Name | Repository | Resource ID |
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DOI landing page - Bioresource Technology article
DOI for the Bioresource Technology article describing the G4 baijiu pit-mud SynCom. |
OTHER | doi:10.1016/j.biortech.2026.135395 |
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Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| Ethanol feedstock | ethanol-based hexanoic acid production | N/A |
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| Optimized G4 process condition | pH 7.9; 37.6 C; 8.2% inoculum; 77% loading volume | N/A |
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| Hexanoic acid yield | 4.69 g/L | N/A |
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