Halococcoides cellulosivorans gen. nov., sp. nov., an extremely halophilic cellulose-utilizing haloarchaeon from hypersaline lakes

International Journal of Systematic and Evolutionary Microbiology
Dimitry Y SorokinIlya V Kublanov

Abstract

An extremely halophilic euryarchaeon, strain HArcel1T, was enriched and isolated in pure culture from the surface brines and sediments of hypersaline athalassic lakes in the Kulunda Steppe (Altai region, Russia) using amorphous cellulose as the growth substrate. The colonies of HArcel1T are pale-orange, and form large zones of cellulose hydrolysis around them. The cells are non-motile cocci of variable size with a thin monolayer cell wall. The isolate is an obligate aerobic heterotroph capable of growth with only three substrates: various forms of insoluble cellulose, xylan and cellobiose. Strain HArcel1T is an extremely halophilic neutrophile, growing within the salinity range from 2.5 to 5 M NaCl (optimum at 3.5-4 M). The core archaeal lipids are dominated by C20-C20 and C25-C20 dialkyl glycerol ethers, in approximately 6:1 proportion. The 16S rRNA and rpoB' gene analysis indicated that HArcel1T forms a separate lineage within the family Haloarculaceae, order Halobacteriales, with the genera Halorhabdus and Halopricus as closest relatives. On the basis of the unique phenotypic properties and distinct phylogeny of the 16S rRNA and rpoB' genes, it is suggested that strain HArcel1T is classified into a new genus and species Halo...Continue Reading

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Citations

May 29, 2020·International Journal of Systematic and Evolutionary Microbiology·Yong-Hong LiuWen-Jun Li
Jul 23, 2020·International Journal of Systematic and Evolutionary Microbiology·Daria G ZavarzinaIlya V Kublanov

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