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Multiple syntrophic interactions in a terephthalate-degrading methanogenic consortium
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Multiple syntrophic interactions in a terephthalate-degrading methanogenic consortium
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Journal Article
Multiple syntrophic interactions in a terephthalate-degrading methanogenic consortium
2011
Overview
Terephthalate (TA) is one of the top 50 chemicals produced worldwide. Its production results in a TA-containing wastewater that is treated by anaerobic processes through a poorly understood methanogenic syntrophy. Using metagenomics, we characterized the methanogenic consortium inside a hyper-mesophilic (that is, between mesophilic and thermophilic), TA-degrading bioreactor. We identified genes belonging to dominant
Pelotomaculum
species presumably involved in TA degradation through decarboxylation, dearomatization, and modified β-oxidation to H
2
/CO
2
and acetate. These intermediates are converted to CH
4
/CO
2
by three novel hyper-mesophilic methanogens. Additional secondary syntrophic interactions were predicted in
Thermotogae
,
Syntrophus
and candidate phyla OP5 and WWE1 populations. The OP5 encodes genes capable of anaerobic autotrophic butyrate production and
Thermotogae
,
Syntrophus
and WWE1 have the genetic potential to oxidize butyrate to CO
2
/H
2
and acetate. These observations suggest that the TA-degrading consortium consists of additional syntrophic interactions beyond the standard H
2
-producing syntroph–methanogen partnership that may serve to improve community stability.
Publisher
Nature Publishing Group UK,Oxford University Press,Nature Publishing Group
