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Halococcoides cellulosivorans gen. nov., sp. nov., an extremely halophilic cellulose-utilizing haloarchaeon from hypersaline lakes
Sorokin, D.Y.; Khijniak, T.V.; Elcheninov, A.G.; Toshchakov, S.V.; Kostrikina, N.A.; Bale, N.J.; Sinninghe Damsté, J.S; Kublanov, I.V. (2019). Halococcoides cellulosivorans gen. nov., sp. nov., an extremely halophilic cellulose-utilizing haloarchaeon from hypersaline lakes. Int. J. Syst. Evol. Microbiol. 69(5): 1327-1335. https://dx.doi.org/10.1099/ijsem.0.003312

Bijhorende info:
In: International Journal of Systematic and Evolutionary Microbiology. Society for General Microbiology: Reading. ISSN 1466-5026; e-ISSN 1466-5034, meer
Peer reviewed article  

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Author keywords
    hypersaline lakes; haloarchaea; cellulose; cellulotrophic; Halorhabdus; Haloarculaceae.

Auteurs  Top 
  • Sorokin, D.Y.
  • Khijniak, T.V.
  • Elcheninov, A.G.
  • Toshchakov, S.V.
  • Kostrikina, N.A.
  • Bale, N.J., meer
  • Sinninghe Damsté, J.S, meer
  • Kublanov, I.V.

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 Halococcoides cellulosivoran gen. nov., sp. nov. (JCM 31941T=UNIQEM U975T).

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