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Candidatus Syntrophosphaera thermopropionivorans: a novel player in syntrophic propionate oxidation during anaerobic digestion
- Source :
- Environmental microbiology reports. 11(4)
- Publication Year :
- 2018
-
Abstract
- Propionate is an important intermediate in the anaerobic mineralization of organic matter. In methanogenic environments, its degradation relies on syntrophic associations between syntrophic propionate-oxidizing bacteria (SPOB) and Archaea. However, only 10 isolated species have been identified as SPOB so far. We report syntrophic propionate oxidation in thermophilic enrichments of Candidatus Syntrophosphaera thermopropionivorans, a novel representative of the candidate phylum Cloacimonetes. In enrichment culture, methane was produced from propionate, while Ca. S. thermopropionivorans contributed 63% to total bacterial cells. The draft genome of Ca. S. thermopropionivorans encodes genes for propionate oxidation via methymalonyl-CoA. Phylogenetically, Ca. S. thermopropionivorans affiliates with the uncultured Cloacimonadaceae W5 and is more distantly related (86.4% 16S rRNA gene identity) to Ca. Cloacimonas acidaminovorans. Although Ca. S. thermopropionivorans was enriched from a thermophilic biogas reactor, Ca. Syntrophosphaera was in particular associated with mesophilic anaerobic digestion systems. 16S rRNA gene amplicon sequencng and a novel genus-specific quantitative PCR assay consistently identified Ca. Syntrophosphaera/Cloacimonadaceae W5 in 9 of 12 tested full-scale biogas reactors thereby outnumbering other SPOB such as Pelotomaculum, Smithella and Syntrophobacter. Taken together the ubiquity and abundance of Ca. Syntrophosphaera, those SPOB might be key players for syntrophic propionate metabolism that have been overlooked before.
- Subjects :
- food.ingredient
Microbial metabolism
Enrichment culture
03 medical and health sciences
food
Bioreactors
Bacterial Proteins
RNA, Ribosomal, 16S
Anaerobiosis
Ecology, Evolution, Behavior and Systematics
Phylogeny
030304 developmental biology
chemistry.chemical_classification
0303 health sciences
biology
Bacteria
030306 microbiology
Thermophile
Temperature
Pelotomaculum
biology.organism_classification
Agricultural and Biological Sciences (miscellaneous)
Syntrophobacter
chemistry
Biochemistry
Propionate
Candidatus
Propionates
Methane
Oxidation-Reduction
Genome, Bacterial
Archaea
Subjects
Details
- ISSN :
- 17582229
- Volume :
- 11
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Environmental microbiology reports
- Accession number :
- edsair.doi.dedup.....26f75a9e5082b0bccfaa12bd4e276ffd