Proteinivorax hydrogeniformans sp. nov., an anaerobic, haloalkaliphilic bacterium fermenting proteinaceous compounds with high hydrogen production
A search for the organisms responsible for the degradation of biomass of primary producers in Tanatar lakes resulted in the isolation of a novel anaerobic, haloalkaliphilic microorganism, strain Z-710T. The strain grows on proteinaceous substrates (peptides) but not on proteins. A rather limited range of substances of other classes can be utilised together with tryptone but not individually. An interesting physiological feature of the novel strain is a high capacity for hydrogen production (up to 30% v/v) during proteolytic fermentation. Phylogenetic analysis based on the 16S rRNA gene sequence similarity revealed that the organism can be assigned to the previously described genus Proteinivorax. According to its physiological features and the low DNA–DNA hybridisation level of the strain with the type strain of the only previously described Proteinivorax species—Proteinivorax tanatarense Z-910T—strain Z-710T is described here as representing a novel species with the name Proteinivorax hydrogeniformans sp. nov. The type strain is Z-710T (= DSM 102085T = VKM B-3042T).
KeywordsAlkaliphiles Anaerobic proteolytic bacteria Hydrogen Proteinaceous fermenters Vitamin B12
This work was supported by the Russian Academy of Sciences Programme No. 30 “Evolution of organic world and planetary processes” and the State Assignment on 2017 for Basic Research “Collection of unique and extremophilic microorganisms for biotechnological application” for Research Center of Biotechnology of the Russian Academy of Sciences. We are grateful to Dr. T. V. Kolganova for the 16S rRNA gene sequencing and to Nadezhda Kostrikina for the electron micrographs.
Conflict of interest
The authors declare that they have no conflict of interest.
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