title: Methanosaeta harundinacea sp. nov., a novel acetate-scavenging methanogen isolated from a UASB reactor.
abstract: Two methanogenic strains, 8AcT and 6Ac, were isolated from an upflow anaerobic sludge blanket reactor treating beer-manufacture wastewater in Beijing, China. Cells of strains 8AcT and 6Ac were rod-shaped (0.8-1.0 x 3-5 microm) and non-motile, occurring singly or in pairs; however, at high cell density the cells were arranged in long chains within a common sheath. The two strains used acetate exclusively for growth and methane production. The specific growth rate of strain 8AcT was 0.030 h(-1) when growing in acetate (20 mM) at 37 degrees C. The temperature range for growth was 25-45 degrees C, with the fastest growth at 34-37 degrees C. The pH range for growth and methane production was 6.5-9.0, with the fastest growth at pH 7.2-7.6. The G+C content of genomic DNA of strain 8AcT was 55.7 mol%. Phylogenetic analysis based on 16S rRNA gene sequence similarity showed that the novel strains clustered with Methanosaeta species; the 16S rRNA gene sequence similarities between strain 8AcT and Methanosaeta concilii DSM 3013 and 'Methanosaeta thermophila' DSM 6194 were 92.5 and 87.3 %, respectively. The sequence similarity levels of mcrA, the gene encoding the alpha-subunit of methyl-coenzyme M reductase, and of the deduced amino acids of mcrA, between strain 8AcT and Methanosaeta concilii DSM 3671T were 36 and 78.9 %, respectively. Based on the phylogenetic and phenotypic analyses, the novel species Methanosaeta harundinacea sp. nov. is proposed, with strain 8AcT (= JCM 13211T = CGMCC 1.5026T) as the type strain.
authors.affiliation: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, P. R. China.
authors.forename: Kai
authors.initials: K
authors.lastname: Ma
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Liu
authors.forename: Xiuzhu
authors.initials: X
authors.lastname: Dong
mesh_terms: D000085:Acetates / Q000378:metabolism; D000693:Anaerobiosis; D001482:Base Composition; D001515:Beer; D019149:Bioreactors; D002681:China; D003470:Culture Media; D004262:DNA Restriction Enzymes / Q000235:genetics; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000378:metabolism; D017019:Methanosarcinaceae / Q000737:chemistry / Q000145:classification* / Q000302:isolation & purification / Q000502:physiology; D008969:Molecular Sequence Data; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid; D012722:Sewage / Q000382:microbiology*; D013045:Species Specificity
chemical_list: D000085:Acetates; D003470:Culture Media; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D010088:Oxidoreductases; D004262:DNA Restriction Enzymes; C060629:endodeoxyribonuclease McrA; D008697:Methane