A novel mesophilic, hydrogenotrophic methanogen, strain SANAET, was isolated from an anaerobic, propionate-degrading enrichment culture, which was originally established from rice paddy soil. The cells were non-motile, Gram-negative and rod-shaped (1.8-2.4 mm long by 0.3-0.6 μm wide). Growth of strain SANAET was observed at 25-40 °C, with an optimum temperature range for growth of 35*37 °C. The pH range for growth was 6.5-7.8, with an optimum at pH 7.0. The salinity range for growth was 0-1 g NaCll-1 (0-17 mM). The isolate was able to utilize H2/CO2 and formate for growth and methane production. The G+C content of the genomic DNA was 56.6 mol%. Based on comparative 16S rRNA gene sequence analysis, strain SANAET was affiliated with a clone lineage of the Archaea, Rice Cluster I (RC-I), placing it between the orders Methanosarcinales and Methanomicrobiales within the class 'Methanomicrobia'. 16S rRNA gene sequence similarities between strain SANAET and members of Methanosarcinales were in the range 80.0-82.8 %, and those between the strain and members of Methanomicrobiales ranged from 77.5 to 82.4 %. In addition to 16S rRNA gene analysis, sequence analysis of the mcrA gene (encoding the a subunit of methyl-coenzyme M reductase, a key enzyme in the methane production pathway) also showed that strain SANAET was affiliated with the RC-I lineage. Here, we propose the name Methanocella paludicola gen. nov., sp. nov. for the isolate, the first of the RC-I lineage. The type strain is SANAET (=JCM 13418T=NBRC 101707T=DSM 17711T). In addition, we also propose the status of order for the RC-I lineage, for which we propose the name Methanocellales ord. nov.
|Number of pages||8|
|Journal||International journal of systematic and evolutionary microbiology|
|Publication status||Published - 2008 Apr 1|
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics