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KMID : 0545120130230111509
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Journal of Microbiology and Biotechnology
2013 Volume.23 No. 11 p.1509 ~ p.1518
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Isolation and Characterization of a Novel Agar-Degrading Marine Bacterium, Gayadomonas joobiniege gen, nov, sp. nov., from the Southern Sea, Korea
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Chi Won-Jae
Park Jae-Seon
Kwak Min-Jung
Jihyun F. Kim
Chang Yong-Keun
Hong Soon-Kwang
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Abstract
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An agar-degrading bacterium, designated as strain G7T, was isolated from a coastal seawater sample from Gaya Island (Gayado in Korean), Republic of Korea. The isolated strain G7T is gram-negative, rod shaped, aerobic, non-motile, and non-pigmented. A similarity search based on its 16S rRNA gene sequence revealed that it shares 95.5%, 90.6%, and 90.0% similarity with the 16S rRNA gene sequences of Catenovulum agarivorans YM01T, Algicola sagamiensis, and Bowmanella pacifica W3-3AT, respectively. Phylogenetic analyses demonstrated that strain G7T formed a distinct monophyletic clade closely related to species of the family Alteromonadaceae in the Alteromonas-like Gammaproteobacteria. The G+C content of strain G7T was 41.12 mol%. The DNA-DNA hybridization value between strain G7T and the phylogenetically closest strain YM01T was 19.63%. The genomes of G7T and YM01T had an average ANIb value of 70.00%. The predominant isoprenoid quinone of this particular strain was ubiquinone-8, whereas that of C. agarivorans YM01T was menaquinone-7. The major fatty acids of strain G7T were Iso-C15:0 (41.47%), Anteiso-C15:0 (22.99%), and C16:1ω7c/iso-C15:0 2-OH (8.85%), which were quite different from those of YM01T. Comparison of the phenotypic characteristics related to carbon utilization, enzyme production, and susceptibility to antibiotics also demonstrated that strain G7T is distinct from C. agarivorans YM01T. Based on its phenotypic, chemotaxonomic, and phylogenetic distinctiveness, strain G7T was considered a novel genus and species in the Gammaproteobacteria, for which the name Gayadomonas joobiniege gen. nov. sp. nov. (ATCC BAA-2321 = DSM25250T = KCTC23721T) is proposed.
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KEYWORD
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Agarase, Alteromonadaceae, Alteromonas-like Gammaproteobacteria, agar degradation, Gayadomonas joobiniege
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