A defined 5-member bacterial consortium from Alabama soil capable of dual cellulose and hemicellulose degradation. The consortium consists of Pseudoxanthomonas byssovorax DB1, Microbacterium oxydans DB2, Bacillus sp. DB7, Ochrobactrum sp. DB8, and Klebsiella sp. DB13. Isolates DB1 and DB2 display the highest cellulase activity (27.83 and 31.22 U/mg), producing a complete enzyme system including filter paper cellulase, β-glucosidase, xylanase, and β-xylosidase for comprehensive lignocellulose bioprocessing.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Pseudoxanthomonas byssovorax DB1 — ontology label: Pseudoxanthomonas byssovorax | NCBITaxon:324747 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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DOMINANT |
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| Microbacterium oxydans DB2 — ontology label: Microbacterium oxydans | NCBITaxon:82380 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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DOMINANT |
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| Bacillus sp. DB7 | NCBITaxon:870529 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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COMMON |
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| Ochrobactrum sp. DB8 | NCBITaxon:870532 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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COMMON |
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| Klebsiella sp. DB13 | NCBITaxon:870530 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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COMMON |
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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.
Cellulose-Hydrolyzing Isolate Enzyme Activities
Selected members of the five-isolate consortium had measured cellulolytic activity in individual isolate cultures: DB1 and DB2 filter-paper cellulase activities were 27.83 and 31.22 U per mg, and DB1 beta-glucosidase was 18.07 U per mg. These positive isolate results support the consortium design, not a directly measured combined-culture rate or obligate syntrophy in the accessible abstract.
Participating Taxa: Pseudoxanthomonas byssovorax DB1, Microbacterium oxydans DB2
Metabolites: cellulose (CHEBI:18246 · MediaIngredientMech · CMMMech), glucose (CHEBI:17234 · MediaIngredientMech · CMMMech)
Biological Processes:
- cellulose catabolic process (GO:0030245 · PathwayMech)
HYPOTHESIZED - Measured isolate hydrolases provide the cellulose-hydrolysis branch proposed to complement the other enzyme activities in the assembled consortium. The causal contribution is biochemical potential inferred from isolate assays and consortium construction, not a measured increase in combined-culture degradation or demonstrated synergistic flux.
Evidence
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PMID:20859703 - SUPPORT (IN_VITRO)"Isolates DB1 and DB2 displayed the highest filter paper cellulase: 27.83 and 31.22 U mg⁻¹, respectively."
Xylan-Hydrolyzing Isolate Enzyme Activities
Isolate DB2 produced the highest xylanase activity, 103.05 U per mg, and DB13 the highest beta-xylosidase activity, 7.72 U per mg, in the tested isolate panel. These observed activities support a hemicellulose-hydrolysis contribution to the defined five-isolate design; the accessible abstract does not supply a combined-culture activity or demonstrate obligate metabolic exchange.
Participating Taxa: Microbacterium oxydans DB2, Klebsiella sp. DB13
Metabolites: xylan (CHEBI:37166 · MediaIngredientMech · CMMMech), xylose (CHEBI:18222 · MediaIngredientMech · CMMMech)
Biological Processes:
- xylan catabolic process (GO:0045493 · PathwayMech)
HYPOTHESIZED - Measured isolate hydrolases provide the hemicellulose-hydrolysis branch proposed to complement the other enzyme activities in the assembled consortium. The causal contribution is biochemical potential inferred from isolate assays and consortium construction, not a measured increase in combined-culture degradation or demonstrated synergistic flux.
Evidence
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PMID:20859703 - SUPPORT (IN_VITRO)"Isolate DB2 produced the highest xylanase activity (103.05 U mg⁻¹), while the highest β-xylosidase activity (7.72 U mg⁻¹) was observed with DB13"
Proposed Complementary Lignocellulose Hydrolysis
HYPOTHESIZED - Five selected isolates were assembled into a defined consortium with cellulolytic and xylanolytic capabilities. Their complementary enzyme activities could broaden cellulose/hemicellulose processing and reduce incomplete-enzyme limitations. The accessible primary abstract proposes this benefit; it does not quantify synergy above additive monoculture activities, relief of product inhibition, lower enzyme demand or lignin breakdown. Full-text experiments remain uninspected behind subscription access, not demonstrated absent.
Metabolites: lignocellulose (CHEBI:180683 · MediaIngredientMech · CMMMech)
Biological Processes:
- polysaccharide catabolic process (GO:0000272 · PathwayMech)
- interspecies interaction between organisms (GO:0044419 · PathwayMech)
Evidence
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PMID:20859703 - SUPPORT (IN_VITRO)"Five selected isolates (DB1, DB2, DB7, DB8, and DB13) were used to compose a defined consortium and characterized by 16S ribosomal RNA gene sequence analysis."
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PMID:20859703 - PARTIAL (IN_VITRO)"Use of microbial consortium in bioprocessing of lignocelluloses could reduce problems such as incomplete synergistic enzymes, end-product inhibition, adsorption, and requirement for high amounts of enzymes in direct use of enzymes."
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN Does the assembled five-isolate consortium outperform its component hydrolases or relieve end-product inhibition?
The accessible primary abstract and existing cache establish isolate activities and consortium construction. Normal publisher access is a subscription preview, so the combined-culture controls and any quantitative synergy remain uninspected. Both proposed hydrolytic-contribution arrows are retained explicitly as hypotheses; obtain authorized full text before strengthening them or adding topology.
Attaches to: ecological_interactions#Cellulose-Hydrolyzing Isolate Enzyme Activities, ecological_interactions#Xylan-Hydrolyzing Isolate Enzyme Activities, ecological_interactions#Proposed Complementary Lignocellulose Hydrolysis
1 evidence item(s)
Use of microbial consortium in bioprocessing of lignocelluloses could reduce problems such as incomplete synergistic enzymes, end-product inhibition, adsorption, and requirement for high amounts of enzymes in direct use of enzymes.
The authors propose potential processing benefits; this is not a quantitative combined-consortium superiority result.
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| Source environment | Alabama soil | N/A |
| Substrate | cellulose and hemicellulose | N/A |
| Enzyme activity | complete hydrolytic system | N/A |
Growth Media
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