Original Paper


, Volume 16, Issue 2, pp 297-305

First online:

Alkalilactibacillus ikkensis, gen. nov., sp. nov., a novel enzyme-producing bacterium from a cold and alkaline environment in Greenland

  • Mariane SchmidtAffiliated withDepartment of Agriculture and Ecology, University of CopenhagenDepartment of Microbiology and Risk Assessment, Technical University of Denmark
  • , Anders PrieméAffiliated withDepartment of Biology, University of Copenhagen
  • , Anders JohansenAffiliated withDepartment of Environmental Chemistry and Microbiology, University of Aarhus
  • , Peter StougaardAffiliated withDepartment of Agriculture and Ecology, University of Copenhagen Email author 

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Three novel Gram-positive, endospore-forming bacteria were isolated from a cold and alkaline environment. Phylogenetic analysis showed that the strains were almost identical, and that they were related to Natronobacillus azotifigens 24KS-1T (95.8% identity), Paraliobacillus quinghaiensis YIM-C158T (95.1%), Paraliobacillus ryukyuensis O15-7T (94.5%), and Halolactibacillus miurensis M23-1T (93.9%). The isolates produced amylase, α-galactosidase, β-galactosidase, and β-glucuronidase, and showed optimal growth at pH 10, at 20°C, and at 2–8% (w/v) NaCl. Major fatty acids were C14:0 (10.6–11.6%), anteiso-C15:0 (25.7–32.7%), C16:1 ω11c (12.2–16.0%), and C16:0 (14.0–20.4%). The major polar lipids were diphosphatidylglycerol and phosphatidylglycerol, and meso-diaminopimelic acid was found in the cell-wall peptidoglycan. The G+C content was 38.4%. DNA–DNA hybridization between strain GCM68T and H. miurensis M23-1T was 32.4%, while hybridization to N. azotifigens 24KS-1T, Amphibacillus tropicus Z-7792T, and Paraliobacillus ryukyuensis O15-7T was below 30%. The phylogenetic analysis and G+C content place strain GCM68T in relation to species belonging to Bacillus rRNA group 1, but phylogenetic and physiologic data combined with chemotaxonomic analyses support our proposal for a new genus, Alkalilactibacillus, gen. nov., with the novel species Alkalilactibacillus ikkensis, sp. nov. (type strain is GCM68T = DSM 19937 = LMG 24405).


α-Galactosidase β-Galactosidase Alkaliphilic Psychrotolerant Cold-active