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Brevibacillus levickii sp. nov. and Aneurinibacillus terranovensis sp. nov., two novel thermoacidophiles isolated from geothermal soils of northern Victoria Land, Antarctica

¹ Department of Biological and Biomedical Sciences, Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 0BA, UK
² Vakgroep BFM WE 10V Laboratorium voor Microbiologie, Universiteit Gent, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium

Correspondence
N. A. Logan
N.A.Logan{at}gcal.ac.uk

Thirteen strains of endospore-forming bacteria were isolated from geothermal soils at Cryptogam Ridge, the north-west slope of Mt Melbourne, and at the vents and summit of Mt Rittmann in northern Victoria Land, Antarctica. 16S rRNA gene sequencing, SDS-PAGE and routine phenotypic characterization tests indicated that the seven isolates from the north-west slope of Mt Melbourne represent a novel species of Brevibacillus and that the six isolates from Cryptogam Ridge and the vents and summit of Mt Rittmann represent a novel species of Aneurinibacillus. Brevibacillus strains were not isolated from the sites at Mt Rittmann or Cryptogam Ridge and Aneurinibacillus strains were not isolated from the north-west slope of Mt Melbourne. Preliminary metabolic studies revealed that L-glutamic acid, although not essential for growth, was utilized by both species. The Brevibacillus species possessed an uptake system specific for L-glutamic acid, whereas the Aneurinibacillus species possessed a more general uptake system capable of transporting other related amino acids. Both species utilized a K⁺ antiport system and similar energy systems for the uptake of L-glutamic acid. The rate of uptake by the Brevibacillus species type strain was 20-fold greater than that shown by the Aneurinibacillus species type strain. The names Brevibacillus levickii sp. nov. and Aneurinibacillus terranovensis sp. nov. are proposed for the novel taxa; the type strains are Logan B-1657^T (=LMG 22481^T=CIP 108307^T) and Logan B-1599^T (LMG 22483^T=CIP 108308^T), respectively.

Graphs showing the effects of ionophores on glutamate uptake (Fig. A) and tables giving the fatty acid profiles (Table A) and the effects of various competitors (Table B) and energy inhibitors (Table C) on glutamate uptake in strains LMG 22481^T and LMG 22483^T are available as supplementary material in IJSEM Online.

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