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Huber, Katharina J.; Geppert, Alicia M.; Wanner, Gerhard; Fösel, Bärbel U.; Wüst, Pia K. and Overmann, Jörg (2016): The first representative of the globally widespread subdivision 6 Acidobacteria, Vicinamibacter silvestris gen. nov., sp nov., isolated from subtropical savannah soil. In: International Journal of Systematic and Evolutionary Microbiology, Vol. 66: pp. 2971-2979

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Members of the phylum Acidobacteria are abundant in a wide variety of soil environments. Despite this, previous cultivation attempts have frequently failed to retrieve representative phylotypes of Acidobacteria, which have, therefore, been discovered by culture-independent methods (13175 acidobacterial sequences in the SILVA database version 123;NR99) and only 47 species have been described so far. Strain Ac_5_C6(T) represents the first isolate of the globally widespread and abundant subdivision 6 Acidobacteria and is described in the present study. Cells of strain Ac_5_C6(T) were Gram-stain-negative, immotile rods that divided by binary fission. They formed yellow, extremely cohesive colonies and stable aggregates even in rapidly shaken liquid cultures. Ac_5_C6(T) was tolerant of a wide range of temperatures (12-40 degrees C) and pH values (4.7-9.0). It grew chemoorganoheterotrophically on a broad range of substrates including different sugars, organic acids, nucleic acids and complex proteinaceous compounds. The major fatty acids of Ac_5_C6(T) were iso-C-17:1 omega 9c, C-18:1 omega 7c and iso-C-15:0. Summed feature 3 (C-16:1 omega 7c/C-16:1 omega 6c), iso-C-17:0 and C-16:0 were also detected. Phosphatidylcholine, phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine and an unidentified glycolipid were identified as polar lipids. The major quinone was MK-8. The DNA G+C content of Ac_5_C6(T) was 65.9 mol%. With 16S rRNA gene sequence similarities of 83-84 %, the closest described relatives were Acidicapsa borealis KA1(T), Acidobacterium capsulatum 161(T), Granulicella pectinovorans TPB6011(T), Occallatibacter riparius 277(T) and Paludibaculum fermentans P105(T). According to the morphological, physiological and molecular characteristics, the novel genus Vicinamibacter gen. nov., and the novel species, Vicinamibacter silvestris sp. nov. (type strain Ac_5_C6(T) = DSM 29464(T) = LMG 29035(T)) are proposed.

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