Shewanella-Geobacter Three-Species Exoelectrogenic Biofilm Community

Community ID CommunityMech:000177

Ecological State ENGINEERED

Environment anode-associated bioelectrochemical reactor biofilm
ENVO:01001405

A defined three-species anode-associated exoelectrogenic biofilm community composed of Shewanella oneidensis, Geobacter sulfurreducens, and Geobacter metallireducens. The community was assembled to study biofilm formation dynamics, strain interactions, redox potential resilience, and electron transfer activity in bioelectrochemical systems.

Taxonomy

Taxon	Ontology ID	Functional Roles	Abundance
Shewanella oneidensis	NCBITaxon:70863	SYNTROPHIC_PARTNER CROSS_FEEDER	ABUNDANT
PMID:28087529 - SUPPORT (IN_VITRO) "Shewanella oneidensis, Geobacter sulfurreducens, and Geobacter metallireducens" PMID:28087529 - SUPPORT (IN_VITRO) "S. oneidensis and G. sulfurreducens upregulated their central metabolisms"
Geobacter sulfurreducens	NCBITaxon:35554	SYNTROPHIC_PARTNER CROSS_FEEDER	ABUNDANT
PMID:28087529 - SUPPORT (IN_VITRO) "Shewanella oneidensis, Geobacter sulfurreducens, and Geobacter metallireducens" PMID:28087529 - SUPPORT (IN_VITRO) "G. sulfurreducens was detected in the planktonic phase"
Geobacter metallireducens	NCBITaxon:28232	SYNTROPHIC_PARTNER CROSS_FEEDER	ABUNDANT
PMID:28087529 - SUPPORT (IN_VITRO) "Shewanella oneidensis, Geobacter sulfurreducens, and Geobacter metallireducens"

Ecological Interactions

Taxon

Cross-feeding

Mutualism

Syntrophy

Competition

Commensalism

Niche partitioning

Colonization facilitation

Strain competition

Predation

Cooperative Exoelectrogenic Biofilm Formation

COLONIZATION_FACILITATION

Source Taxon: Shewanella oneidensis

Target Taxon: anode-associated biofilm community

Biological Processes:

biofilm formation (GO:0042710)

Evidence

PMID:28087529 - SUPPORT (IN_VITRO)

"organisms build a stable biofilm on an electrode surface"

Positive Mixed-Species Interaction

MUTUALISM

Source Taxon: Shewanella oneidensis

Target Taxon: Geobacter sulfurreducens

Biological Processes:

oxidation-reduction process (GO:0055114)

Evidence

PMID:28087529 - SUPPORT (IN_VITRO)

"Transcriptomic results point toward a positive interaction among the individual strains"
PMID:28087529 - SUPPORT (IN_VITRO)

"S. oneidensis and G. sulfurreducens upregulated their central metabolisms"

Accelerated Electron Transfer in Mixed-Species Anode Communities

SYNTROPHY

Source Taxon: Shewanella oneidensis

Target Taxon: anode

Biological Processes:

oxidation-reduction process (GO:0055114)

Evidence

PMID:28087529 - SUPPORT (IN_VITRO)

"positive interactions that might lead to accelerated electron transfer"
PMID:28087529 - SUPPORT (IN_VITRO)

"coculture anodic network"

Associated Datasets

Dataset	Type	Repository	Accession
GSE79750 exoelectrogenic biofilm transcriptome dataset GEO Series for transcriptomic measurements from the multispecies exoelectrogenic biofilm community in bioelectrochemical systems.	METATRANSCRIPTOME	OTHER	GSE79750

External Resources

Name	Repository	Resource ID
Exact-system primary publication - three-species exoelectrogenic biofilm Primary publication reporting the defined S. oneidensis, G. sulfurreducens, and G. metallireducens anode-associated exoelectrogenic biofilm community.	OTHER	PMID:28087529
PMID:28087529 - SUPPORT (IN_VITRO) "Shewanella oneidensis, Geobacter sulfurreducens, and Geobacter metallireducens"

Environmental Factors

Factor	Value	Unit
Electrode surface biofilm habitat	anode-associated biofilm	N/A
PMID:28087529 - SUPPORT (IN_VITRO) "stable biofilm on an electrode surface"
Applied anode redox potential	maximum electron transfer above 0.04 V versus normal hydrogen electrode	N/A
PMID:28087529 - SUPPORT (IN_VITRO) "maximum electron transfer rates at electrode potentials that were higher than 0.04 V"
Redox-potential resilience	resilient to anode redox-potential changes	N/A
PMID:28087529 - SUPPORT (IN_VITRO) "resilient to changes in the redox potential of the anode"