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Marine Biotechnology Institute, 3-75-1 Heita, Kamaishi, Iwate 026-0001, Japan
Correspondence
Hiroaki Kasai
hiroaki.kasai{at}mbio.jp
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ABSTRACT |
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9c) supported the affiliation of the new isolates to the genus Ferrimonas. The results of physiological and biochemical tests allowed phenotypic differentiation of the isolates from F. balearica. It is therefore proposed that the new isolates represent a novel species with the name Ferrimonas marina sp. nov. and type strain A4D-4T (=MBIC06480T=DSM 16917T).
Published online ahead of print on 6 May 2005 as DOI 10.1099/ijs.0.63689-0.
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of the strains examined here are AB193748–AB193756, and those for the gyrB gene sequences are AB193757–AB193766.
Details of the strains isolated in this study are given in a supplementary table in IJSEM Online.
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MAIN TEXT |
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).
Chromosomal DNA was purified from the above nine strains by using the Genomic-tip and buffer set (Qiagen). The 16S rRNA gene fragment was amplified by using universal primers corresponding to positions 8–27 as the forward primer and 1492–1510 as the reverse primer (Escherichia coli numbering system; Weisburg et al., 1991). The 1460 bp nucleotide sequences thus determined were used to search for phylogenetically related bacteria. The 16S rRNA gene sequences were compared with both the bacterial sequence data stored in the DDBJ database by using the BLAST algorithm (Altschul et al., 1990) and the 16S rRNA gene sequence data stored in RDP-II (Cole et al., 2003) by using the Sequence Match tool. Both results suggested that the closest recognized relative was Ferrimonas balearica. The gyrB gene was analysed to differentiate the nine strains, plus the type strain of F. balearica, DSM 9799T. The gyrB gene fragment covering positions 274–1525 in the E. coli gyrB gene was amplified by using the deoxyinosine-containing primers UP1Ei (5'-GAAGTCATCACCGTTCTGCAYGSIGGIGGIAARTTYRA-3') and UP2ri (5'-AGCAGGGTACGGATGTGCGAGCCRTCIACRTCIGCRTCIGTCAT-3'). The PCR products were purified by using a Suprec-02 cartridge (Takara Biochemicals). Sequencing was performed by using primers UP1s (5'-GAAGTCATCACCGTTCTGCA-3') and UP2rs (5'-AGCAGGGTACGGATGTGCGAGCC-3') as described by Yamamoto & Harayama (1995).
The 1460 bp nucleotide sequences of the 16S rRNA gene and 1170 bp gyrB gene sequences were used for a phylogenetic analysis. This analysis was performed by using the TREECON (Van de Peer & De Wachter, 1994) and MEGA2 (Kumar et al., 2001) software packages after multiple alignment of the data by CLUSTAL X (Thompson et al., 1997). Distances (distance options according to the Kimura two-parameter model) and clustering by the neighbour-joining (NJ) and maximum-parsimony methods were determined by using bootstrap values based on 1000 replications. Alignment gaps and unidentified base positions were not taken into consideration for the calculations.
Phylogenetic trees constructed by using the NJ method based on 16S rRNA and gyrB gene sequence data are shown in Fig. 1. The ten strains were clustered into two groups based on both genes with a high bootstrap value (100 %). One group includes strains A2A-18, A3B-47-3, A3B-58, A3B-57-2 and the type strain of F. balearica DSM 9799T, and the second group includes A2A-30, A3B-8, A3B-59, A3B-64-2 and A4D-4T. The number of nucleotide substitutions in each group for the 16S rRNA gene varied from 2 to 24, with a mean sequence similarity of greater than 98·4 %, whereas the nucleotide substitutions between strains in the two groups varied from 33 to 43, with a mean sequence similarity of less than 97·7 %. For the gyrB gene, the number of nucleotide substitutions in each group varied from 6 to 57, with a mean sequence similarity of greater than 95·1 %, whereas the number of nucleotide substitutions between strains in the two groups varied from 176 to 198, with a mean sequence similarity of less than 85·0 %. These values represent sufficient sequence diversity to imply distinct species (Satomi et al., 2003).
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) with Photoprobe® biotin (Vector)-labelled probes under optimal conditions (2xSSC and 50 % formamide at 50 °C). A colorimetric detection method was applied, using ABTS diammonium salt (Wako) as the substrate and the streptavidin–horseradish peroxidase conjugate (Gibco-BRL) as the colorimetric enzyme. The DNA–DNA hybridization results indicate that seven strains, including F. balearica DSM 9799T, could be divided into two groups, I and II, with hybridization values of greater than 65 %. Group I consisted of strains A4D-4T, A2A-30, A3B-8 and A3B-59, and group II consisted of strains A2A-18, A3B-47-3 and F. balearica DSM 9799T. Levels of DNA–DNA relatedness for the other three strains, A3B-58, A3B-57-2 and A3B-64-2, against those in groups I and II were less than 10 %. The strains classified into group I were subsequently analysed taxonomically using a polyphasic approach in comparison with the strains in group II.
Chemotaxonomic markers were determined in order to identify whether the new isolates were members of the genus Ferrimonas. The cell material used for the chemotaxonomic analysis was obtained from a culture grown in marine broth 2216 (MB; Difco) at pH 7·6 for 24 h at 25 °C on a rotary shaker. Cells were harvested by centrifugation and washed with artificial sea water. Isoprenoid quinones were analysed by the modified method of Nishijima et al. (1997). Quinones were extracted with chloroform/methanol (2 : 1, v/v) from the freeze-dried cells. After centrifugation, the supernatant was evaporated to dryness and then suspended in acetone. An aliquot of the acetone solution was analysed by an HPLC-atmospheric pressure chemical ionization (APCI)-MS/MS system using a C30 Develosil column (Nomura Chemical). The quinone profile of F. balearica DSM 9799T as determined in this study was as follows: MK-7, 62·9 %; Q-8, 20·4 %; Q-7, 16 %. The isolated strains showed the same types of menaquinone and ubiquinones: A4D-4T (MK-7, 52·2 %; Q-7, 25·3 %; Q-8, 17 %), A2A-30 (43·9, 26·8, 25·2 %), A3B-8 (41·5, 31·6, 18·7 %) and A3B-59 (44·3, 29·7, 21·9 %). Cellular fatty acids were extracted from lyophilized cells, methylated and then analysed by using a Shimadzu QP5050A GC/MS instrument. Fatty acid methyl ester (FAME) peaks were identified with BAME Mix (Supelco) by using retention time comparisons against standard compounds. Further identification, including verification of the double-bond position, was performed using the pyrrolidide conversion method (Andersson & Holman, 1974). The fatty acid compositions are shown in Table 1. Cells grown in MB at pH 7·6 and 25 °C for 24 h were used for the analysis. The fatty acid profile of F. balearica DSM 9799T was different from the published data (Rosselló-Mora, 1995), possibly because the culture medium used was different. The major fatty acids in all isolates and in F. balearica cultures, grown in MB at pH 7·6, were C18 : 19c, C16 : 0 and iso-C15 : 0. DNA base compositions were determined by the HPLC method described by Tamaoka & Komagata (1984); values are shown in Table 2.
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. Cells of the new isolates were Gram-negative rods, motile by means of polar flagella. Cells grown for 2 days at 25 °C on pH 7·6 MA were 0·2–0·5 µm in diameter and 3·5 µm in length. The range of NaCl concentration for growth was determined on a triple-sugar-iron (TSI) medium supplemented with 0–10 % NaCl. Two strains (A2A-18 and A3B-47-3) were able to grow at 0·5–7·5 % NaCl, whereas others (A2A-30, A3B-8, A3B-59 and A4D-4T) were only able to grow at 1·5–3·5 % or 5·5 % NaCl; the optimal concentration for growth was 3·5 %. The range of temperature for growth (4, 15, 20, 25, 30, 37 and 42 °C) was determined on pH 7·6 MA for 1 week. All strains except two (A2A-18 and A3B-47-3) were able to grow at 15–37 °C; optimum growth occurred at 25–30 °C. Strains A2A-18 and A3B-47-3 were able to grow at up to 42 °C. The ability to grow at pH 5·0–11·0 was tested on MA adjusted to various pH values. All strains grew in the pH range 6·0–11·0. To clarify their iron-reducing activity, each strain was cultivated under anaerobic conditions, using lactate as an electron donor and carbon source and iron(III) oxyhydroxide or iron(III) citrate as an electron acceptor (Lovley & Phillips, 1986). The amount of iron(II) in each culture bottle was measured by using ferrozine (Kostka & Nealson, 1998). In comparison with F. balearica DSM 9799T, the iron-reducing activity of strain A4D-4T was too low to be detected by the ferrozine method.
Physiological and biochemical tests were performed by using the GN2 MicroPlate (BiOLOG) and APIZYME (bioMérieux) systems. Observation of utilization tests was continued for 1 week. Other tests, including those for casein hydrolysis, aesculin hydrolysis and production of indole, DNase, gelatinase, catalase, oxygenase, urease and amylase, were conducted as described by Smibert & Krieg (1994). H2S production was observed with SIM medium and TSI agar (Eiken). Based on the phenotypic characteristics, seven isolates could be differentiated into the two groups as shown in Table 2
. The phenotype profile of the group incorporating strains A2A-18 and A3B-47-3 was similar to that of F. balearica DSM 9799T. The group incorporating strains A2A-30, A3B-8, A3B-59 and A4D-4T could be classified as novel based on growth at 42 °C, NaCl requirement for growth, H2S production on TSI agar, hydrolysis of casein, hydrolysis of aesculin and BiOLOG profiles for dextrin and D-glucose utilization.
The genus Ferrimonas was first described by Rosselló-Mora et al. (1995). The existence of Ferrimonas-related marine bacteria was recognized as 0·2-µm-filterable bacteria in sea-water samples (Haller et al., 2000); however, the genus currently comprises only one recognized species, F. balearica (Rosselló-Mora et al., 1995). We have been able to show here the genetic and phenotypic diversity of Ferrimonas strains cultivated by using MA at pH 11.
Description of Ferrimonas marina sp. nov.
Ferrimonas marina (ma.ri'na. L. fem. adj. marina of, or belonging to, the sea, marine).
Cells are 1–3·5 µm long, Gram-negative rods motile by means of polar flagella. Circular, opaque, beige colonies are formed after 2 days in MB at 25 °C. Facultatively anaerobic. Growth occurs at 15–37 °C, with an optimum at 25–30 °C. The pH range for growth is 6·0–11·0, with an optimum at pH 7·0–8·0. NaCl is required for growth; growth occurs over a concentration range of 1·5–3·5 % (w/v) and is optimal at 3·0 %. The quinone system of strain A4D-4T grown in MB consists of MK-7 (52·2 %), Q-7 (25·3 %) and Q-8 (17 %). The fatty acid profile of strain A4D-4T grown in MB includes iso-C15 : 0 (11·5 %), C16 : 0 (13·9 %) and C18 : 19c (16·3 %) as major components. Acid is produced from dextrin, D-glucose and maltose, but not from sucrose, D-fructose, D-mannitol, D-mannose, D-sorbitol, glycerol, lactose, L-arabinose or m-inositol. The G+C content of the DNA is 60–61 mol%.
The type strain, A4D-4T (=MBIC06480T=DSM 16917T), was isolated from a macroalgal sample from Okinawa, Japan.
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ACKNOWLEDGEMENTS |
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REFERENCES |
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