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Five bacterial strains (SYSU YG23T, SYSU 10HL1970T, 10HP82-10, 10HL1938, 10HP457) isolated from water reservoirs of cooling systems were characterized using a polyphasic taxonomic approach. The isolates were Gram-stain-negative, strictly aerobic and non-motile. Growth was enhanced in the presence of l-cysteine. The major fatty acids (&gt;5 %) for the five strains were C10 : 0, C16 : 0, C16 : 0 3-OH, C18 : 0 3-OH and C18 : 1ω9c. Ubiquinone-8 was detected as the respiratory quinone while the polar lipid profile consisted of phosphatidylethanolamine, diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, three unidentified phospholipids, two unidentified aminophospholipids and three unidentified glycolipids. The strains shared 16S rRNA gene sequence similarities of 99.0-99.2 % with Francisella guangzhouensis 08HL01032T but less than 95.2 % with other members of the family Francisellaceae. The phylogenetic dendrogram based on 16S rRNA gene sequences showed that these strains form a separate cluster along with Francisella guangzhouensis. This cluster was also confirmed from multilocus-sequence typing based on sequences of the mdhA, rpoB and sdhA genes. Matrix-assisted laser desorption ionization time-of-flight MS analyses of the strains along with closely and distantly related Francisella strains also showed a distinct cluster for these strains. Based on the findings from the polyphasic taxonomy studies, the strains were considered to represent two novel species of a new genus for which the names Allofrancisella inopinata gen. nov., sp. nov. (type strain SYSU YG23T=KCTC 42968T=DSM 101834T) and Allofrancisella frigidaquae sp. nov. (type strain SYSU 10HL1970T=KCTC 42969T=DSM 101835T) are proposed. In addition, Francisella guangzhouensisQu et al. 2013 is proposed to be transferred to this new genus as Allofrancisella guangzhouensis comb. nov.

international journal of systematic and evolutionary microbiology

Allofrancisella inopinata gen. nov., sp. nov. and Allofrancisella frigidaquae sp. nov., isolated from water-cooling systems, and transfer of Francisella guangzhouensis Qu et al. 2013 to the new genus as Allofrancisella guangzhouensis comb. nov.