Sphingomonas hankyongensis sp. nov. isolated from tap water
A Gram reaction-negative, strictly aerobic, non-motile, translucent and rod-shaped bacterium (designated W1-2-4T) isolated from tap water was characterized by a polyphasic approach to clarify its taxonomic position. Strain W1-2-4T was observed to grow optimally at 25–30 °C and at pH 6.5 on nutrient agar. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain W1-2-4T belongs to the genus Sphingomonas and is most closely related to the Sphingomonas fennica K101T (95.3 % similarity). The G+C content of genomic DNA was 67.1 mol%. Chemotaxonomic data [major ubiquinone—Q-10, major polyamine—homospermidine, major fatty acids—summed feature 8 (comprising C18:1 ω7c/ω6c), C16:0 and C14:0 2OH] supported the affiliation of strain W1-2-4T to the genus Sphingomonas. Strain W1-2-4T could be differentiated genotypically and phenotypically from the recognized species of the genus Sphingomonas. The novel isolate therefore represents a novel species, for which the name Sphingomonas hankyongensis sp. nov. is proposed, with the type strain W1-2-4T (=KACC 18308T = LMG 28595T).
KeywordsSphingomonas hankyongensis 16S rRNA sequence Polyphasic taxonomy Tap water
This research was supported by the project on survey and excavation of Korean indigenous species of the National Institute of Biological Resources (NIBR) under the Ministry of Environment, Korea.
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