1887

Abstract

Two Gram-negative, rod-shaped, non-spore-forming bacteria, isolated from metal working fluids were investigated to determine their taxonomic positions. On the basis of 16S rRNA gene sequence phylogeny, both strains (MPA 1113 and MPA 1105) formed a distinct cluster with 97.7 % sequence similarity between them, which was in the vicinity of members of the genera , , , , and to which they showed low sequence similarities (below 94 %). The predominant compounds in the polyamine pattern and in the quinone system of the two strains were spermidine and ubiquinone Q-10, respectively. The polar lipid profiles were composed of the major compounds: phosphatidylmonomethylethanolamine, phosphatidylglycerol, phosphatidylcholine, major or moderate amounts of diphosphatidylglycerol, two unidentified glycolipids and three unidentified aminolipids. Several minor lipids were also detected. The major fatty acids were either C cyclo ω8 or Cω7. The results of fatty acid analysis and physiological and biochemical tests allowed both, the genotypic and phenotypic differentiation of the isolates from each other, while the chemotaxonomic traits allowed them to be differentiated from the most closely related genera. In summary, low 16S rRNA gene sequence similarities and marked differences in polar lipid profiles, as well as in polyamine patterns, is suggestive of a novel genus for which the name gen. nov. is proposed. MPA 1113 ( = CCM 8528 = LMG 28286 = CIP 110802) and MPA 1105 ( = CCM 8527 = LMG 28285) are proposed to be the type strains representing two novel species within the novel genus, gen. nov., for which the names sp. nov. and sp. nov. are suggested, respectively.

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2015-01-01
2021-10-21
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