Background: Conversion of long-chain fatty acids (LCFA) in anaerobic digesters relies on syntrophic relationship between acetogenic bacteria and methanogenic archaea. Conversion of unsaturated- and saturated-LCFA has been previously shown by a coculture of Syntrophomonas zehnderi and Methanobacterium formicium. Degradation of unsaturated- LCFA is rare among Syntrophomonas species; the best studied fatty acid oxidizer, S. wolfei, can only grow on saturated-LCFA. Objectives: Major differences are expected in the pathways and enzymes involved in the degradation of unsaturated-LCFA. In this work we used proteogenomic approach to study these differences. Methods: A draft genome of S. zehnderi was obtained by Illumina HiSeq sequencing. Genomes of S. zehnderi and S. wolfei (available at NCBI) were compared. S. zehnderi and M. formicicum co-cultures grown on oleate (unsaturated LCFA, C18:1) and on stearate (saturated LCFA, C18:0) were further studied using a proteomics approach. Conclusions: Genomic comparison of S. zehnderi and S. wolfei revealed approximately 900 different proteins and 1200 common proteins. In the genome of S. zehnderi, two replicates of the unsaturated acyl-CoA dehydrogenase genes were identified, one of which differs considerably from the acyl-CoA gene found in S. wolfei. Proteomic analysis of S. zehnderi and M. formicium co-cultures revealed high expression levels of proteins related to the ß-oxidation of LCFA (up to 30% of total proteins identified). Different protein expression levels were observed during the degradation of oleate (44% unique proteins) and stearate (23% unique proteins). In addition, proteins involved in electron transfer were highly expressed, including electron transfer flavoproteins, ATP synthases and a number of hydrogenases and formate dehydrogenases.
|Publication status||Published - 2015|
|Event||FEMS 2015-6th Congress of European Microbiologists, Maastricht, The Netherlands - |
Duration: 7 Jun 2015 → 11 Jun 2015
|Conference||FEMS 2015-6th Congress of European Microbiologists, Maastricht, The Netherlands|
|Period||7/06/15 → 11/06/15|