A defined two-strain consortium of Pseudomonas aeruginosa PA and Paracoccus pantotrophus PP assembled from contaminated-soil isolates for bifenthrin biodegradation. P. aeruginosa PA hydrolyzes bifenthrin, while P. pantotrophus PP oxidizes the resulting bifenthrin-alcohol intermediate; PA extracellular polymeric substances also modify the local chemical microenvironment.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Pseudomonas aeruginosa PA — ontology label: Pseudomonas aeruginosa | NCBITaxon:287 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
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N/A |
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| Paracoccus pantotrophus PP — ontology label: Paracoccus pantotrophus | NCBITaxon:82367 · TaxonMech · TraitMech |
PRIMARY_DEGRADER
CROSS_FEEDER
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N/A |
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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.
Hydrolyzer-oxidizer division of labor
The source reports complementary hydrolysis and oxidation steps in the two-member consortium. PARTIAL: removal of the intermediate is proposed to relieve hydrolase inhibition, but the accessible abstract does not isolate that mediator or demonstrate ecological niche partitioning.
Participating Taxa: Pseudomonas aeruginosa PA, Paracoccus pantotrophus PP
Biological Processes:
- xenobiotic metabolic process (GO:0006805 · PathwayMech)
The reported sequential transformations couple substrate breakdown to intermediate removal and are offered as the explanation for faster consortium removal. PARTIAL: hydrolase-specific mediation is not independently resolved by the accessible abstract.
Evidence
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PMID:42269294 - SUPPORT (IN_VITRO)"PA served as the hydrolyzer, cleaving the ester bond of bifenthrin to generate bifenthrin alcohol and trifluorochloro-chrysanthemic acid, while PP, as the oxidizer, efficiently degraded bifenthrin alcohol"
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PMID:42269294 - SUPPORT (IN_VITRO)"relieving steric hindrance on PA hydrolases and establishing an essential cooperative degradation partnership"
Bifenthrin-intermediate cross-feeding
CROSS_FEEDINGThe source reports directed coupling between production and downstream transformation of the bifenthrin-alcohol intermediate. PARTIAL: this cross-feeding interpretation concerns sequential biotransformation; the abstract does not establish recipient growth dependence or directly traced carbon assimilation.
Source Taxon: Pseudomonas aeruginosa PA
Target Taxon: Paracoccus pantotrophus PP
Biological Processes:
- xenobiotic metabolic process (GO:0006805 · PathwayMech)
Reported downstream transformation of the intermediate couples the two degradation steps and contributes to the consortium removal advantage. PARTIAL: the accessible abstract does not separate that contribution from other concurrent processes.
Evidence
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PMID:42269294 - SUPPORT (IN_VITRO)"PA served as the hydrolyzer, cleaving the ester bond of bifenthrin to generate bifenthrin alcohol and trifluorochloro-chrysanthemic acid, while PP, as the oxidizer, efficiently degraded bifenthrin alcohol"
Accelerated Bifenthrin Removal
The consortium showed a higher bifenthrin-removal rate and greater final removal than either monoculture under the reported assay comparison. Preserve this measured advantage separately from the proposed transfer mechanism; it does not itself demonstrate complete mineralization or reciprocal partner fitness.
Participating Taxa: Pseudomonas aeruginosa PA, Paracoccus pantotrophus PP
Biological Processes:
- xenobiotic metabolic process (GO:0006805 · PathwayMech)
Evidence
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PMID:42269294 - SUPPORT (IN_VITRO)"k3 = 0.26 d-1 > k1 = 0.15 d-1> k2 = 0.10 d-1"
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PMID:42269294 - SUPPORT (IN_VITRO)"resulting in 92.38% removal within 7 days"
Knowledge gaps & discussions (1)
KNOWLEDGE_GAP OPEN What distinguishes intermediate transformation from assimilation and specific causal mediation?
All three nodes and both existing directions are retained. The primary abstract supports sequential transformations and the positive consortium comparison. It does not independently resolve recipient growth dependence, carbon assimilation or the hydrolase-specific mediator; unavailable methods are not proof those tests were absent. No new biological mechanisms, growth-optimization details or experimental designs were added.
Attaches to: ecological_interactions#Hydrolyzer-oxidizer division of labor, ecological_interactions#Bifenthrin-intermediate cross-feeding, ecological_interactions#Accelerated Bifenthrin Removal
2 evidence item(s)
relieving steric hindrance on PA hydrolases and establishing an essential cooperative degradation partnership
Supports the authors explanation for the benefit of intermediate removal, not independently verified steric mediation.
k3 = 0.26 d-1 > k1 = 0.15 d-1> k2 = 0.10 d-1
Supports the PA+PP consortium degradation rate exceeding either monoculture.
External Resources
| Name | Repository | Resource ID |
|---|---|---|
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Primary publication - PA+PP bifenthrin consortium
Primary mechanistic study of the exact PA+PP synthetic consortium. |
OTHER | PMID:42269294 |
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Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| PA extracellular polymeric substances | promoted bifenthrin adsorption and electron transfer | N/A |
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| Initial bifenthrin concentration | 100 | mg/L |
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| Tween 80 dispersant | 0.1 | percent |
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| Bifenthrin removal | 92.38 | percent |
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| Consortium degradation rate constant | 0.26 | d-1 |
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Growth Media
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