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Caldalkalibacillus thermarum gen. nov., sp. nov., a novel alkalithermophilic bacterium from a hot spring in China

¹ State Key laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
² Department of Biotechnology, University of the Western Cape, Bellville 7535, South Africa
³ Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK
⁴ Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
⁵ Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain

Correspondence
Yanhe Ma
mayanhe{at}sun.im.ac.cn

A thermophilic, alkaliphilic and catalase-positive bacterium, designated strain HA6^T, was isolated from a hot spring in China. The strain was aerobic and chemo-organotrophic and grew optimally at 60 °C, pH 8.5 and 1.5 % (w/v) NaCl. The cells were Gram-positive rods, forming single terminal endospores. The predominant cellular fatty acids were iso-C_{15 : 0} and iso-C_{17 : 0}. The cell-wall peptidoglycan contained meso-diaminopimelic acid. The genomic DNA G+C content was 45.2 mol%. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that strain HA6^T formed a distinct lineage within the family Bacillaceae and was most closely related to Bacillus horti K13^T and Bacillus smithii DSM 4216^T, with sequence similarities of 91.8 and 93.1 %, respectively. On the basis of its physiological and molecular properties, strain HA6^T should be placed in a novel genus and species, for which the name Caldalkalibacillus thermarum gen. nov., sp. nov. is proposed. The type strain of Caldalkalibacillus thermarum is strain HA6^T (=CGMCC 1.4242^T=JCM 13486^T).

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