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Arthrobacter alpinus sp. nov., a psychrophilic bacterium isolated from alpine soil

¹ Institute of Microbiology, University of Innsbruck;
² DSMZ;
³ China General Microbiological Culture Collection Center

⁴ E-mail: rosa.margesin{at}uibk.ac.at

The psychrophilic bacterium S6-3T was isolated from alpine soil. The aerobic, Gram-positive, non-motile strain exhibited a rod-coccus growth cycle and produced a yellow pigment. Growth occurred at a temperature range of 1-25°C. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain S6-3T was related to the members of the genus Arthrobacter, sharing the highest sequence similarities with Arthrobacter psychrolactophilus (97.9%) and Arthrobacter stackebrandtii (97.6%). Strain S6-3T had MK-9 as the major menaquinone and anteiso-C15:0 as the major fatty acid. The cell-wall peptidoglycan was of the type A3alpha L-Lys-L-Thr-Ala3. The predominant cell wall sugars were galactose and rhamnose. The genomic DNA G+C content was 61.9 mol%. On the basis of the phenotypic characteristics, phylogenetic analysis and DNA-DNA relatedness data, a novel species, Arthrobacter alpinus sp. nov., is proposed, with the type strain S6-3T (= DSM 22274T = CGMCC 1.8950T).