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Sphingomonas jaspsi sp. nov., a novel carotenoid-producing bacterium isolated from Misasa, Tottori, Japan

Life Science Research Center, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa 252-8510, Japan

Correspondence
Dalal Asker
dasker{at}brs.nihon-u.ac.jp

A yellow-pigmented, Gram-negative, motile, strictly aerobic, pleomorphic bacterium (strain TDMA-16^T) was isolated from a freshwater sample collected at Misasa (Tottori, Japan). Strain TDMA-16^T was slightly tolerant to gamma-ray irradiation and produced carotenoids, including zeaxanthin, nostoxanthin and an unknown carotenoid, effectively [1.7 mg (g dry cells)^–1]. The DNA G+C content of strain TDMA-16^T was 63.3 mol%. Phylogenetic analysis based on 16S rRNA gene sequences placed strain TDMA-16^T in a distinct lineage in the family Sphingomonadaceae; sequence data showed that strain TDMA-16^T was most closely related to Sphingomonas mali IFO 15500^T (95.1 %), Sphingomonas aquatilis JSS7^T (95.0 %), Sphingomonas pruni IFO 15498^T (94.9 %), Sphingomonas melonis DSM 14444^T (94.9 %) and Sphingomonas asaccharolytica IFO 15499^T (94.5 %). The major fatty acids of strain TDMA-16^T were C_{17 : 1}6c (34.5 %) and C_{18 : 1}7c (29.3 %). The presence of Q-10 as the main ubiquinone, the Sphingomonadaceae-specific sphingoglycolipid in the polar lipid profile and 2-hydroxy fatty acids, plus the absence of 3-hydroxy fatty acids, supported identification of this strain as a member of the genus Sphingomonas sensu stricto. Phylogenetic distinctiveness and unique phenotypic characteristics differentiated strain TDMA-16^T from closely related Sphingomonas species. The results of polyphasic taxonomic analyses suggest that strain TDMA-16^T represents a novel Sphingomonas species, for which the name Sphingomonas jaspsi sp. nov. is proposed. The type strain is strain TDMA-16^T (=NBRC 102120^T=DSM 18422^T=CCUG 53607^T).

SEMs of cells of strain TDMA-16^T are available as supplementary material with the online version of this paper.

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