Parasphingopyxis algicola sp nov., isolated from a marine red alga Asparagopsis taxiformis and emended description of the genus Parasphingopyxis Uchida et al. 2012

초록

An aerobic, Gram-stain-negative, yellow-pigmented bacterium, designated strain ATAX6-5(T), was isolated from a marine red alga, Asparagopsistaxiformis, in South Korea. Cells were non-motile rods showing catalase-and oxidase-positive reactions. Growth of strain ATAX6-5(T) was observed at 5-35 degrees C (optimum, 30 degrees C), at pH 6.0-9.5 (optimum, pH 7.0) and in the presence of 0-6.0% (w/v) NaCl (optimum, 2 %). Ubiquinone-10 was detected as the sole isoprenoid quinone and C-18:1 omega 7c, C-16:0 and C-17:1 omega 6c were identified as the major cellular fatty acids. Diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, sphingoglycolipid, phosphatidylcholine, an unknown phospholipid and four unknown glycolipids were detected as polar lipids. The G+C content of the genomic DNA was 60.4 mol%. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain ATAX6-5(T) formed a tight phylogenic lineage with Parasphingopyxis lamellibrachiae JAMH 0132(T) with a 100% bootstrap value. Strain ATAX6-5(T) was most closely related to P. lamellibrachiae JAMH 0132(T) with a 96.9% 16S rRNA gene sequence similarity. Based on phenotypic, chemotaxonomic and molecular features, strain ATAX6-5(T) clearly represents a novel species of the genus Parasphingopyxis, for which the name Parasphingopyxis algicola sp. nov. is proposed. The type strain is ATAX6-5(T) (= KACC 18993(T) = JCM 31719(T)). An emended description of the genus Parasphingopyxis is also proposed.

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