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Aliivibrio Sifiae Sp. Nov., Luminous Marine Bacteria Isolated from Seawater

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Aliivibrio Sifiae Sp. Nov., Luminous Marine Bacteria Isolated from Seawater J. Gen. Appl. Microbiol., 56, 509‒518 (2010) Short Communication Aliivibrio sifi ae sp. nov., luminous marine bacteria isolated from seawater Susumu Yoshizawa,1,* Hajime Karatani,2 Minoru Wada,3 Akira Yokota,4 and Kazuhiro Kogure1 1 Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277‒8564, Japan 2 Department of Biomolecular Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Sakyo-ku, Kyoto 606‒8585, Japan 3 Graduate School of Science and Technology, Nagasaki University, Nagasaki 852‒8521, Japan 4 Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113‒0032, Japan (Received May 28, 2010; Accepted August 18, 2010) Key Words—Aliivibrio sifi ae sp. nov.; luminous bacteria; marine bacteria; Vibrionaceae Species of the Fischeri clade (Sawabe et al., 2007) and bioluminescent symbiosis (Lupp and Ruby, 2005; in the genus Vibrio were reclassified as a new genus Nyholm and Mcfall-Ngai, 2004). Aliivibrio (Gammaproteobacteria: Vibrionaceae) based The aim of this study was to determine the taxonom- on phylogenetic and phenotypic differences (Urbanc- ic position of strains H1-1T and H1-2 by a polyphasic zyk et al., 2007). At present, the genus comprises taxonomic approach that included multilocus se- 5 species: Aliivibrio fi scheri (Beijerinck, 1889), Aliivibrio quence analysis (MLSA), chemotaxonomic character- logei (Harwood et al., 1980), Aliivibrio salmonicida ization, DNA‒DNA hybridization and physiological (Egidius et al., 1986), Aliivibrio wodanis (Lunder et al., properties. 2000) and Aliivibrio fi nisterrensis (Beaz-Hidalgo et al., Strain H1-1T (NBRC 105001T) and H1-2 (NBRC 2010). The strains within genus Aliivibrio occur in cer- 105002) were isolated from surface seawater at Haru- tain kinds of marine animals such as fish or squid mi Pier in Tokyo Bay, Japan in 2007. The samples were (Dunlap and Kita-Tsukamoto, 2006; Dunlap et al., filtered through a polycarbonate filter (pore size of 2007). Except for A. fi nisterrensis, it was reported that 0.2 μm) (Whatman International, Ltd., Maidstone, UK), the Aliivibrio species contain luminous strains (Ast et which was then placed on half strength marine agar al., 2009; Dunlap and Kita-Tsukamoto, 2006). Addition- 2216E (Difco) and kept at 20°C. Luminous colonies ally, some strains of A. fi scheri have been studied in- grown on the agar plate were isolated with sterile tensively as a model organism of luminous bacteria toothpicks utilizing a CCD camera (ATTO Bioscience because of their quorum regulation of luminescence & Technology, Tokyo, Japan) and transferred to new marine agar 2216E plates for isolation. The isolates were repeatedly purified and stored at -80°C in marine * Address reprint requests to: Dr. Susumu Yoshizawa, Atmo- broth containing 20% (v/v) glycerol. sphere and Ocean Research Institute, The University of Tokyo, Cell morphology and flagella were observed using 5‒1‒5 Kashiwanoha, Kashiwa, Chiba 277‒8564, Japan. atomic force microscopy (model SPM-9500 J2; Shi- Tel and Fax: +81‒4‒7136‒6417 madzu) as was described before (Nishino et al., 2004). E-mail: [email protected] The GenBank/EMBL/DDBJ accession numbers for the 16S The temperature range for growth was determined by rDNA, gyrB, pyrH, gapA, ftsZ, topA, mreB, recA and rpoA gene incubating the isolates on the marine agar 2216E (Dif- sequences used in this study are shown in Table 6. co). The growth on different NaCl concentrations 510 YOSHIZAWA et al. Vol. 56 [0.5‒10% (w/v)] was determined on tryptone soya agar encoding urydilate kinase (pyrH), DNA gyrase β sub- (Difco). The growth pH range was determined using unit (gyrB), glyceraldehyde 3-phosphate dehydroge- the marine agar 2216E after adjusting the pH to 4, 5, 6, nase (gapA), RNA polymerase α subunit (rpoA) and 9, 10, 10.5 and 11 using HCl or NaOH. The tempera- DNA recombination protein (recA) were used for mul- ture range, pH range and NaCl range for growth were tilocus sequence analysis (MLSA) (Sawabe et al., determined after 2 days’ incubation. Catalase activity 2007). PCR primers for the six genetic loci and reac- was determined by bubble formation in a 3% (v/v) tion conditions were used according to Sawabe et al. H2O2 solution. Oxidase activity was determined by cy- (2007) and Thompson et al. (2005). To test the evolu- tochrome oxidase paper (Nissui Pharmaceutical). API tionary relationships of the genus Aliiviibrio, phyloge- 20E and API ZYM strips (bioMérieux) were used to de- netic analysis was performed with the program MEGA4 termine physiological and biochemical characteristics. (Tamura et al., 2007). Multiple alignments of the API 20E and API ZYM were read after 48 h incubation sequences were performed using CLUSTAL_W at 20°C and 6 h incubation at 20°C, respectively. All (version 1.6) (Thompson et al., 1994). Distances were suspension media for API test strips were supplement- calculated using the Kimura two-parameter model ed with 2% (w/v) NaCl solution (final concentration). (Kimura, 1980). Clustering based on the neighbor-join- Hydrolysis reaction (Starch, Tween 20, Tween 40, ing method (Saitou and Nei, 1987) and the maximum- Tween 60 and Tween 80) and nitrate reduction were parsimony method were determined using bootstrap analyzed by conventional methods. Cellular fatty acid values based on 1,000 replication (Felsenstein, 1985). composition (MIDI system) was determined as de- Sequence data for other Vibrio species from online scribed previously (Xie and Yokota, 2003). The cells electronic taxonomic scheme for vibrios (http://www. were grown for 48 h at 20°C on plates of marine agar taxvibrio.lncc.br) and GenBank were used in this 2216E. A few fatty acid compositions could not be study. clearly identified by using the MIDI system. Therefore, The 16S rRNA gene sequences analysis indicated summed features 2 and 3 were further analyzed as fol- that H1-1T and H1-2 belong to the genus Aliivibrio us- lows: the fatty acid samples, together with non-polar ing the neighbor-joining method and maximum-parsi- fatty acid and hydroxyl fatty acid standards used for mony method (Figs. 1 and 2). The 16S rRNA gene comparison, were developed on TLC plates (silica-gel sequences similarities between H1-1T and species of F254; Merck) with hexane/ethyl ether (1：1), sprayed Aliivibrio were 99.3% to A. wodanis, 99.0% to A. logei, with a 0.02% dichlorofluorescein solution in ethanol, 98.4% to A. salmonicida, 98.5% to A. fi nisterrensis and dried and detected under UV light. The separated 97.2% to A. fi scheri. A phylogenetic tree based on spots of the non-polar fatty acids and hydroxyl fatty MLSA (16S rRNA, pyrH, recA, rpoA, gapA and gyrB; acids were scraped from the plates, transferred to 4,195 bp) using the neighbor-joining method con- tubes and extracted with ethyl ether. The extracts were firmed their distinction from other species of genus then concentrated under a stream of nitrogen gas and Aliivibrio; sequence similarities between H1-1T and dissolved in hexane/methyl tert-butyl ether (1：1). The species of Aliivibrio were 96.4% to A. wodanis, 95.3% separated and purified non-polar fatty acids and hy- to A. logei, 95.1% to A. salmonicida, 95.1% to A. fi nis- droxyl fatty acids were detected by using the MIDI sys- terrensis and 91.8% to A. fi scheri (Fig. 3 and Table 1). tem again. Phylogenetic trees using each gene (pyrH, recA, rpoA DNA was prepared according to the method of Mar- and gyrB) also showed that H1-1T and H1-2 were dif- mur (1961) from cells grown on marine agar 2216E ferentiated from known Aliivibrio species (Figs. 4‒7), and the DNA base composition was determined by us- whereas phylogenetic analysis using gapA could not ing an HPLC method (Mesbah et al., 1989). DNA‒DNA distinguish these strains from other Aliivibrio species hybridizations were carried out with photobiotin- (Fig. 8). Thompson et al. (2007) also reported that labeled probes in microplate wells as described by gapA was not high-resolution among Vibrio harveyi Ezaki et al. (1989). The hybridization temperature was species group. set at 40.7°C. A fragment (approx. 1,500 bp) of the 16S Additionally, we conducted DNA‒DNA hybridization rRNA gene was amplified from the extracted DNA by of the close relatives. DNA‒DNA hybridization values using bacterial universal primers specific to the 16S between H1-1T and other Aliivibrio species were 40.0% rRNA gene (27F and 1492R) (Lane, 1991). The genes (A. wodanis ATCC BAA-104T), 38.9% (A. logei ATCC 2010 Aliivibrio sifi ae sp. nov.―new taxa Proteobacteria 511 Fig. 1. Phylogenetic tree based on the partial 16S rRNA gene sequences. This tree was constructed based on neighbor-joining. Numbers at nodes denote the level of bootstrap based on 1,000 replications; only values greater than 50% are shown. Alteromonas macleodii was used as an outgroup. Scale bar, 1% estimated sequence divergence. 29985T) and 19.7% (A. salmonicida NCIMB 1281T). and green colonies, respectively. These strains grow The DNA‒DNA hybridization value between H1-1T and on marine agar as luminescent and unpigmented H1-2 strains was 71.3% (Table 2). These genetic re- translucent colonies. On the basis of the API 20E and sults indicated that these strains were included in API ZYM tests, strain H1-1T and H1-2 can be discrimi- same genospecies and distinguished from any known nated from other Aliivibrio species. In contrast to most Aliivibrio species. The DNA G+C contents of H1-1T of their phylogenetic neighbors, these strains can pro- and H1-2 were 40.2 and 40.2 mol%, respectively duce β-galactosidase, lysine decarboxylase, leucine- (Table 2). arylamidase and N-acetyl-β-glucosaminidase and can Strain H1-1T and H1-2 grow on TCBS agar as yellow utilize glucose and mannitol (Table 3 and description).
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