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Fontibacter flavus gen. nov., sp. nov., a new member of the family Cytophagaceae, isolated from a hot spring in Taiwan

¹ Institut für Angewandte Mikrobiologie, Universität Giessen, Giessen, Germany;
² Department of Soil Environmental Science, College of Agriculture and Natural Resources;
³ Laboratory of Microbiology, Department of Seafood Science, National Kaohsiung;
⁴ Yenepoya Research Center, Yenepoya University, Nityanada Nagar, Deralakatte, Mangalore, 575 018;
⁵ Inst Bakteriologie, Mykologie und Hygiene, Veterinärmedizinische Universität Wien, Austria

⁶ E-mail: peter.kaempfer{at}umwelt.uni-giessen.de

A bright orange-pigmented bacterial strain, designated CC-GZM-130T, isolated from a water sample of the Guan-zing-ling hot spring, Southern Taiwan, was studied for its taxonomic allocation. The strain was able to grow on nutrient agar at 25°C - 40°C and in the presence of 1 to 3% NaCl. Comparative analyses of the 16S rRNA gene sequence showed that the isolate was grouped in the vicinity of the genus Aquiflexum with the highest sequence similarity of 92.1% to the type strain of Aquiflexum balticum, followed by 92.0% sequence similarity to that of Algoriphagus ornithinivorans, 91.6% to that of Algoriphagus hitonicola and 91.5% sequence similarity to that of Belliella baltica. The polyamine pattern showed the major compound sym-homospermidine. The quinone system is menaquinone MK-7. The polar lipid profile was composed predominantly of phosphatidylethanolamine, three polar lipids and one aminolipid. Minor amounts of other lipids were detectable as well. The fatty acid profile shared major characteristic with those of B. baltica and A. balticum with iso-C15:0, iso-C17:19c and iso-C17:0 3OH as the major fatty acids, but some qualitative and quantitative differences were evidenced. The DNA G+C content was 53.2 mol%. The strain is genotypically and phenotypically clearly different from representatives of the most closely related genera. On the basis of these differences we propose a novel genus with one novel species with the name Fontibacter flavus gen. nov., sp. nov. The type strain is CC-GZM-130T (CCUG 57694T = CCM 7650T).