Halapricum hydrolyticum sp. nov., a beta-1,3-glucan utilizing haloarchaeon from hypersaline lakes

Dimitry Y. Sorokin*, Alexander G. Elcheninov, Alexander Y. Merkel, Nocole J. Bale, Jaap S. Sininghe-Damste, Ilya V. Kublanov

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Two strains of neutrophilic haloaloarchaea were selectively enriched from hypersaline lakes in southwestern Siberia using β-1,3-glucans as a substrate. The strains were nearly identical in their phenotypes and according to
phylogenomic analysis, and represent a distant novel species group in the genus Halapricum of the family Haloarculaceae.
The main phenotypic property of the novel isolates is the ability to hydrolyze and grow with the polysaccharides curdlan and pachyman. Such potential has, to date, not been seen in any other haloarchaea in pure cultures. The strains are obligately aerobic saccharolytics. Apart from the insoluble β-1,3-glucans, they utilized soluble α-glucans (starch, pullulan and glycogen) and a limited number of sugars. The major ether-bound polar phospholipids include PGP-Me and PG. The glyco- and sulfolipids were absent. The major respiratory menaquinone is MK-8:8. On the basis of their unique physiological properties and the results of phylogenomic analysis, the isolates are suggested to be classified into a novel species Halapricum hydrolyticum sp. nov. (type strain HArc-curdl5-1T = DSM 114193T = UQM 41587T).
Original languageEnglish
Article number126471
Number of pages9
JournalSystematic and Applied Microbiology
Volume46
Issue number6
DOIs
Publication statusPublished - 2023

Keywords

  • Hypersaline lakes
  • Haloarchaea
  • β-1,3-glucans
  • Curdlan
  • Pachyman
  • Halapricum

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