Cinnamate β-Oxidation Consortium

Community ID CommunityMech:000018

Ecological State STABLE

Environment anaerobic environment — ontology label: active anaerobic enrichment culturing unit
ENVO:01001825 · HabitatMech ↗

A syntrophic 3-member anaerobic consortium for degradation of cinnamate via β-oxidation to benzoate, consisting of Papillibacter cinnamivorans, Syntrophus sp., and Methanobacterium formicicum. P. cinnamivorans performs β-oxidation of cinnamate to benzoate, followed by syntrophic benzoate degradation by Syntrophus sp. to acetate, H2, and CO2, with the methanogen consuming H2 to produce methane. This stepwise aromatic compound degradation pathway is important for anaerobic bioremediation.

Taxonomy

Taxon	Ontology ID	Functional Roles	Abundance
Papillibacter cinnamivorans	NCBITaxon:100176 · TaxonMech · TraitMech	PRIMARY_DEGRADER	DOMINANT
PMID:12432464 - SUPPORT (IN_VITRO) "It was found to consist of three morphologically distinct microbes, viz., a short, rod-shaped, non-motile bacterium with distinctly pointed ends, Papillibacter cinnamivorans; a rod-shaped, motile bacterium with rounded ends, Syntrophus sp.; and a methanoarchaeon, Methanobacterium sp. This methanogen was then replaced by a collection strain of Methanobacterium formicicum"
Syntrophus sp. — ontology label: Syntrophus <bacteria>	NCBITaxon:43773 · TaxonMech · TraitMech	SYNTROPHIC_PARTNER	ABUNDANT
PMID:12432464 - SUPPORT (IN_VITRO) "It was found to consist of three morphologically distinct microbes, viz., a short, rod-shaped, non-motile bacterium with distinctly pointed ends, Papillibacter cinnamivorans; a rod-shaped, motile bacterium with rounded ends, Syntrophus sp.; and a methanoarchaeon, Methanobacterium sp. This methanogen was then replaced by a collection strain of Methanobacterium formicicum"
Methanobacterium formicicum	NCBITaxon:2162 · TaxonMech · TraitMech	SYNTROPHIC_PARTNER	ABUNDANT
PMID:12432464 - SUPPORT (IN_VITRO) "It was found to consist of three morphologically distinct microbes, viz., a short, rod-shaped, non-motile bacterium with distinctly pointed ends, Papillibacter cinnamivorans; a rod-shaped, motile bacterium with rounded ends, Syntrophus sp.; and a methanoarchaeon, Methanobacterium sp. This methanogen was then replaced by a collection strain of Methanobacterium formicicum"

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.

Taxon

Syntrophy

Other

Cinnamate β-Oxidation to Benzoate

Papillibacter cinnamivorans converts cinnamate to benzoate, providing the intermediate for subsequent syntrophic degradation. Conversion still occurred with the methanogenesis inhibitor BESA. The authors propose beta-oxidation; the accessible abstract does not resolve its enzyme steps or establish a commensal fitness relationship.

Source Taxon: Papillibacter cinnamivorans

Metabolites: cinnamate (CHEBI:23252 · MediaIngredientMech · CMMMech), benzoate (CHEBI:30746 · MediaIngredientMech · CMMMech)

Downstream Effects:

→ Syntrophic Benzoate Degradation

Benzoate formed by P. cinnamivorans supplies substrate for the Syntrophus-methanogen association. The reported stepwise conversion and BESA-associated arrest at benzoate support this substrate connection without resolving every enzyme step.

Evidence

PMID:12432464 - SUPPORT (IN_VITRO)

"In the presence of bromoethanesulfonic acid (BESA), cinnamate was transformed to benzoate, whereas under methanogenic conditions without BESA, cinnamate was first transformed to benzoate via beta-oxidation and subsequently completely degraded into acetate, CH(4), and CO(2)"

Syntrophic Benzoate Degradation

SYNTROPHY

Syntrophus sp. and the methanogen form the association reported to degrade benzoate to acetate, methane and carbon dioxide. Syntrophic interdependence is reported during growth on cinnamate. HYPOTHESIZED - H2 transfer is a candidate coupling mechanism, not an experimentally identified electron carrier in the accessible abstract.

Source Taxon: Syntrophus sp.

Target Taxon: Methanobacterium formicicum

Metabolites: benzoate (CHEBI:30746 · MediaIngredientMech · CMMMech), acetate (CHEBI:30089 · MediaIngredientMech · CMMMech), carbon dioxide (CHEBI:16526 · MediaIngredientMech · CMMMech)

Biological Processes:

benzoate metabolic process (GO:0018874 · PathwayMech)

Downstream Effects:

→ Methanogenesis

HYPOTHESIZED - benzoate oxidation could supply H2 as reducing equivalents for CO2-reducing methanogenesis. The observed association and methane product support metabolic coupling, but the accessible abstract does not discriminate electron carriers or trace carbon and electron flux between partners.

Evidence

PMID:12432464 - SUPPORT (IN_VITRO)

"Papillibacter cinnamivorans was responsible for benzoate production from cinnamate, whereas a syntrophic association between Syntrophus sp. and the methanogen degraded benzoate to acetate, CH(4), and CO(2)"

Methanogenesis

SYNTROPHY

PARTIAL - Methanobacterium formicicum replaced the original Methanobacterium isolate in the reconstituted consortium, and methane was reported among its degradation products. HYPOTHESIZED - consumption of partner-derived H2 with CO2 reduction explains a possible methanogenic route, but the accessible abstract does not resolve that transfer. Acetate remains among the reported products; complete mineralization of all cinnamate carbon is not established.

Source Taxon: Methanobacterium formicicum

Metabolites: carbon dioxide (CHEBI:16526 · MediaIngredientMech · CMMMech), methane (CHEBI:16183 · MediaIngredientMech · CMMMech)

Biological Processes:

methane biosynthetic process (GO:0015948 · PathwayMech)

Evidence

PMID:12432464 - PARTIAL (IN_VITRO)

"In the presence of bromoethanesulfonic acid (BESA), cinnamate was transformed to benzoate, whereas under methanogenic conditions without BESA, cinnamate was first transformed to benzoate via beta-oxidation and subsequently completely degraded into acetate, CH(4), and CO(2)"

Knowledge gaps & discussions (1)

KNOWLEDGE_GAP OPEN Which interspecies electron carrier and carbon balance support methanogenesis during cinnamate degradation?

The primary abstract establishes benzoate formation, syntrophic benzoate degradation and acetate/methane/CO2 products, but not an experimentally resolved H2-versus-alternative carrier or full carbon mineralization. The subscription body was unavailable; exact-system gas/carrier measurements, partner perturbations and carbon balance are needed before promoting the proposed H2 route to demonstrated transfer. The supported benzoate substrate link remains intact.

Attaches to: ecological_interactions#Cinnamate β-Oxidation to Benzoate, ecological_interactions#Syntrophic Benzoate Degradation, ecological_interactions#Methanogenesis

Environmental Factors

Factor	Value	Unit
Anaerobic conditions	strict	N/A
Substrate	cinnamate	N/A
Degradation pathway	stepwise (cinnamate → benzoate → acetate/CH4/CO2)	N/A

Growth Media

basal medium (cinnamate as sole carbon and energy source)

Atmosphere ANAEROBIC

Preparation notes: Cinnamate provided as the carbon and energy source; consortium grown under methanogenic conditions; 2-bromoethanesulfonic acid (BESA) used to inhibit methanogenesis.

Evidence

PMID:12432464

"A syntrophic consortium was enriched in a basal medium containing cinnamate as the carbon and energy source"

PMID:12432464

"under methanogenic conditions without BESA, cinnamate was first transformed to benzoate via beta-oxidation"

Cross-Mech Suite Links

Explore related entities across the CultureBotAI X-Mech knowledge bases:

HabitatMech: anaerobic environment ↗ TaxonMech: Papillibacter cinnamivorans ↗ TraitMech: Papillibacter cinnamivorans ↗ TaxonMech: Syntrophus sp. ↗ TraitMech: Syntrophus sp. ↗ TaxonMech: Methanobacterium formicicum ↗ TraitMech: Methanobacterium formicicum ↗ CultureMech Growth Media ↗ PathwayMech Pathways ↗