Journal
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
Volume 69, Issue 5, Pages 1327-1335Publisher
MICROBIOLOGY SOC
DOI: 10.1099/ijsem.0.003312
Keywords
hypersaline lakes; haloarchaea; cellulose; cellulotrophic; Halorhabdus; Haloarculaceae
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Funding
- Russian Science Foundation [16-14-00121]
- European Research Council (ERC) under the European Union [694569]
- Russian Science Foundation [16-14-00121] Funding Source: Russian Science Foundation
- European Research Council (ERC) [694569] Funding Source: European Research Council (ERC)
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An extremely halophilic euryarchaeon, strain HArcel1(T), 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 HArcel1(T) 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 HArcel1(T) 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 HArcel1(T) 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 HArcel1(T) is classified into a new genus and species Halococcoides cellulosivorans gen. nov., sp. nov. (JCM 31941(T) =UNIQEM U975(T)).
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