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Acetobacter thailandicus sp. nov., for a strain isolated in Thailand

Abstract

A Gram-negative, rod-shaped, and non-motile bacterium, designated as isolate AD25T, was isolated from a flower of the blue trumpet vine (Thunbergia laurifolia) at Tong Pha Phum, Kanchanaburi, Thailand. Phylogenetic analyses of 16S rRNA gene, 16S-23S rRNA gene internal transcribed spacer (ITS) region, and groEL gene sequences showed that the isolate was quite remote and constituted a cluster independent from the type strains of other Acetobacter species. The isolate was closely related to Acetobacter cibinongensis, one of the closest relatives, with 98.3 % 16S rRNA gene sequence similarity. The DNA G -+- C content of the isolate was 51.4 mol%. The isolate grew intensely on 10 % ethanol with 1.5 % D-glucose in the presence of 0.3 % peptone and 0.3 % yeast extract, and grew weakly on 3.0 % D-glucose in the presence of 0.1 % ammonium sulfate as the sole source of nitrogen. The isolate produced only D-gluconic acid from D-glucose. Based on physiological, biochemical, and genotypic differences between the isolate and the type strains of the validly named species, it is proposed that the isolate be classified as a novel species of Acetobacter, for which the name Acetobacter thailandicus sp. nov. is introduced. The type strain is isolate AD25T (= BCC 15839T = NBRC 103583T).

Introduction

Acetic acid bacteria (AAB) that belong to the family Acetobacteraceae, known as Alphaproteobacteria, are commonly found and associated with different kinds of sugary and alcoholic materials. Strains of the genus Acetobacter are used for vinegar fermentation because of their intense ability to oxidize ethanol to acetic acid and their extremely high resistance to the resulting acetic acid (De Ley et al. 1984; Swings 1992). The genus Acetobacter is characterized by gram-negative aerobic rods and by the production of catalase, except for strains of Acetobacter peroxydans, and is differentiated from other genera by the intense oxidation of acetate and lactate to carbon dioxide and water and by the presence of the Q-9 system (Asai et al. 1964; Yamada et al. 1969; De Ley et al. 1984; Cleenwerck and De Vos 2008). At the time of writing, the following 25 species have been reported: Acetobacter aceti, A. indonesiensis, A. cerevisiae, A. cibinongensis, A. pasteurianus, A. lovaniensis, A. orleanensis, A. estunensis, A. malorum, A. orientalis, A. peroxydans, A. pomorum, A. syzygii, A. tropicalis, A. oeni, A. ghanensis, A. nitrogenifigens, A. senegalensis, A. fabarum, A. farinalis, A. okinawensis, A. papayae, A. persici, A. lambici, and A. sicerae (Skerman et al. 1980; Sokollek et al. 1998; Lisdiyanti et al. 2000, 2001a, b; Cleenwerck et al. 2002; Lisdiyanti et al. 2002; Dutta and Gachhui 2006; Silva et al. 2006; Cleenwerck et al. 2007; Ndoye et al. 2007; Cleenwerck et al. 2008; Tanasupawat et al. 2011a, b; Iino et al. 2012, 2013; Li et al. 2014; Spitaels et al. 2014).

In a previous study, 23 strains isolated in Thailand and assigned to the genus Acetobacter were identified at the species level by analysing the 16S rRNA and groEL gene sequences. The isolates were grouped into ten groups and identified as the species (Pitiwittayakul et al. 2014).

This paper proposes Acetobacter thailandicus sp. nov. as an additional Thai strain isolated at Tong Pha Phum, Kanchanaburi, Thailand on July 2, 2002 as the twenty-sixth species of the genus Acetobacter.

Materials and methods

Bacterial isolation, reference strains, culture medium, and culture conditions

Isolate AD25T (= BCC 15839T = NBRC 103583T) was isolated from the flower of a blue trumpet vine by an enrichment culture approach using glucose/ethanol/yeast extract (GEY) medium, as briefly described below (Yamada et al. 1976, 1999; Kommanee et al. 2008; Muramatsu et al. 2009; Tanasupawat et al. 2011a). A sample source was incubated at pH 4.5 and 30 °C for 3–5 days in a liquid GEY medium (15 ml/tube) composed of 0.2 % D-glucose, 5.0 % ethanol and 1.0 % yeast extract. When microbial growth was observed, the culture was streaked onto a GEY-agar plate containing 0.3 % CaCO3. The acetic acid bacteria were selected as acid-producing bacterial strains that formed a clear zone around the colony on GEY-agar plate containing 0.3 % CaCO3. The reference strains of the genus Acetobacter were A. orientalis BCC 23127T, A. cibinongensis BCC 23126T-, and A. tropicalis BCC 23123T. Isolate AD25T and the reference strains used in this study were grown in a GEY broth on a rotary shaker (150–200 rpm) at 30 °C for 24 h.

PCR amplification of 16S rRNA, 16S-23S rRNA gene ITS and groEL gene sequences

Genomic DNA was extracted by the method described by Okumura et al. (1985). Primer sequences for the amplification and sequencing of the 16S rRNA genes were forward primer 27f; 5′-AGAGTTTGATCCTGGCTCAG-3′ and reverse primer 1525r; 5′-AAAGGAGGTGATCCAGCC-3′ (Devereux and Wills 1995). Polymerase chain reaction (PCR) amplification was done, as described previously (Seearunruangchai et al. 2004).

For 16S-23S rRNA gene ITS amplification, primer 1522f (5′-TGCGGYTGGATCACCTCCT-3′) and primer 38r (5′GTGCCWAGGCATCCACCG-3′) were used (Ruiz et al. 2000). PCR analysis was conducted as described by Ruiz et al. (2000).

The groEL-specific primers for PCR amplification totalled nine (Table 1). In the present study, the primers for PCR amplification and sequencing of groEL genes were designed on the basis of the genome sequences of A. pasteurianus IFO 3283 (Azuma et al. 2009) and A. pomorum DM001 (Shin et al. 2011), except for primers groEL-10-F and groEL-11-R (Cleenwerck et al. 2010). The primers FgroEL and RgroEL amplified the nearly full length groEL genes of almost all strains, except for the type strains of A. peroxydans, A. cerevisiae, A. pomorum, A. aceti, A. oeni, A. estunensis, and A. nitrogenifigens, and isolate AD25T, in which an alternative primer combination, FgroELnew/RgroELnew, FgroEL89/RgroEL89, and groEL-10-F/groEL-11-R was used (Cleenwerck et al. 2010). Amplification and sequencing of all strains were done under the conditions described by Naser et al. (2005) and Cleenwerck et al. (2010). However, the optimized annealing temperature was changed to 54 °C for all primers.

Table 1 Primers used in this study

Sequence data analysis and phylogenetic tree construction

Purified PCR products were sent to the First Base Laboratory (Selangor, Malaysia) for DNA sequencing. DNA sequences of the isolate obtained were edited by using the Chromas 2.33 program (http://www.technelysium.com.au/chromas.html). The DNA sequences of the isolate and the type strains of all the known species of the genus Acetobacter were aligned using CLUSTAL W (version 1.83; Thompson et al. 1994). Gaps in the sequences were deleted using the BioEdit program (Hall 1999). The phylogenetic relationships among species using 16S rRNA gene, 16S-23S rRNA gene ITS, and groEL gene sequences were analyzed by the neighbor-joining approach (Saitou and Nei 1987) listed in MEGA (the Molecular Evolutionary Genetic Analysis, version-5.1 software; Tamura et al. 2011). For the neighbor-joining analysis, the distance between the sequences was calculated by Kimura’s two-parameter model (Kimura 1980). Bootstrap values were obtained for 1,000 randomly generated trees (Felsenstein 1985). The pair-wise sequence similarity values (%) of 16S rRNA genes, 16S-23S rRNA gene ITS, and groEL genes were calculated without considering gaps in the sequences with 1,343, 413, and 866 bases, respectively, among the species type strains.

DNA base composition and DNA-DNA hybridization

Chromosomal DNA was prepared by the method of Saito and Miura (1963). DNA base composition was determined by the method of Tamaoka and Komagata (1984).

DNA-DNA hybridization was performed by the photobiotin-labeling method with microplate wells, as described by Ezaki et al. (1989). Isolated, single stranded, and labeled DNA was hybridized with DNA from test strains in 2 × SSC and 50 % formamide at 45.0 °C for 15 h. The biotinylated DNA was quantitatively detected with streptavidin-POD and 3, 3′, 5, 5′-Tetramethylbenzidine (TMB). Levels of DNA-DNA similarity (%) were determined colorimetrically (Verlander 1992). The color intensity was measured at A450 on a model Versa Max microplate reader (Molecular Devices, Sunnyvale, CA, USA).

Phenotypic characterization

Isolate AD25T was examined for phenotypic features (Hucker and Conn 1923; Asai et al. 1964; Gosselé et al. 1980; Tanasupawat et al. 2011a). The isoprenoid quinone of the isolate was determined by the method of Yamada et al. (1969). The phenotypic features were mainly determined by incubating the isolate and test strains on glucose/yeast extract/peptone/glycerol (GYPG) agar or broth, which was composed of 10 g of D-glucose, 5 g of yeast extract, 10 g of peptone, and 10 g of glycerol, with or without 15 g of agar in one liter of water. The growth of the isolate and test strains was additionally tested on a glucose/ethanol/calcium carbonate/agar (GECA) medium which consisted of 1.5 % D-glucose, 10 % ethanol, 0.3 % peptone, 0.3 % yeast extract, 0.7 % calcium carbonate, and 1.2 % agar, or on Frateur’s modified Hoyer medium, consisting of 3.0 % D-glucose, 0.1 % ammonium sulfate, 0.09 % potassium dihydrogen phosphate, 0.01 % dipotassium hydrogen phosphate, 0.025 % magnesium sulfate hydrated, and 0.0005 % hydrated ferric chloride.

Results and discussion

Phylogenetic analysis based on 16S rRNA, 16S-23S rRNA gene ITS, and groEL gene sequences

In a phylogenetic tree based on 16S rRNA gene sequences of 1,343 bases derived from the neighbor-joining method, the genus Acetobacter was divided into two major phylogenetic groups, i.e., Group I that corresponds to the Acetobacter aceti group and Group II that corresponds to the Acetobacter pasteurianus group with a bootstrap value of 100 % (Fig. 1) (Yamada and Yukphan 2008). Isolate AD25T was included in Group I and formed an independent cluster without any indications of bootstrap values and was quite remote from the type strains of any other species of the genus Acetobacter. The phylogenetic data obtained suggested that the isolate constitutes a new species within the genus Acetobacter.

Fig. 1
figure 1

Phylogenetic relationships of Acetobacter thailandicus isolate AD25T. The phylogenetic tree based on 16S rRNA gene sequences of 1,343 bases was constructed by the neighbor-joining method. Numerals at nodes indicate bootstrap values (%) derived from 1,000 replications. Gluconacetobacter liquefaciens NBRC 12388T and Granulibacter bethesdensis NIH1T were used as outgroups. Sequence accession numbers for 16S rRNA gene sequences are provided in parentheses

In a phylogenetic tree based on 16S-23S rRNA gene ITS sequences of 413 bases derived from the neighbor-joining method, the two major phylogenetic groups mentioned above were also found in the genus Acetobacter with a bootstrap value of 64 % (Fig. 2). However, the type strains of the four species, A. aceti, A. nitrogenifigens, A. oeni, and A. estunensis, which were once included in Group I, as well as the type strain of Gluconacetobacter liquefaciens, which was used as one of outgroups, were not located in the two major groups but in Sub-group I, differing from the two groups in the phylogenetic tree reported by González and Mas (2011) as well as the two groups in the phylogenetic trees of the genus Gluconobacter reported by Tanasupawat et al. (2004), Yukphan et al. (2004), and Malimas et al. (2009). Isolate AD25T was included in Group I and formed an independent cluster with a bootstrap value of 52 %.

Fig. 2
figure 2

Phylogenetic relationships of Acetobacter thailandicus isolate AD25T. The phylogenetic tree based on 16S-23S rRNA gene ITS sequences of 413 bases was constructed by the neighbor-joining method. Numerals at nodes indicate bootstrap values (%) derived from 1,000 replications. Gluconacetobacter liquefaciens NBRC 12388T and Granulibacter bethesdensis NIH1T were used as outgroups. The sequence accession numbers for 16S-23S rRNA gene ITS sequences are provided in parentheses

In a phylogenetic tree based on groEL gene sequences of 866 bases derived from the neighbor-joining method, the resulting two major phylogenetic groups were similar to those based on 16S-23S rRNA gene ITS sequences (Fig. 3). The type strains of the four species A. aceti, A. nitrogenifigens, A. oeni, and A. estunensis were not located in the two major groups but in Sub-group I. In addition, the two species A. peroxydans and A. papayae, which were once included in Group II, were not located in the two major groups but in Sub-group II. Isolate AD25T was located in Group I and formed an independent cluster with a bootstrap value of 70 %.

Fig. 3
figure 3

Phylogenetic relationships of Acetobacter thailandicus isolate AD25T. The phylogenetic tree based on groEL gene sequences of 866 bases was constructed by the neighbor-joining method. Numerals at nodes indicate bootstrap values (%) derived from 1,000 replications. Gluconacetobacter liquefaciens NBRC 12388T and Granulibacter bethesdensis NIH1T were used as outgroups. Sequence accession numbers for groEL gene sequences are provided in parentheses

16S rRNA gene, 16S-23S rRNA gene ITS, and groEL gene sequences similarities

The calculated pair-wise 16S rRNA gene sequence similarity values of isolate AD25T were 98.3, 98.0, 98.1, 97.8, 97.9, 97.9, 97.6, 98.2, 97.9, 97.9, 97.6, 98.0, 97.5, 97.9, 97.5, 97.5, 97.5, 97.7, 97.4, 97.0, 96.7, 96.9, 96.9, 98.0, and 97.6 %, respectively, to the type strains of Acetobacter cibinongensis, A. indonesiensis, A. orientalis, A. aceti, A. malorum, A. cerevisiae, A. ghanensis, A. senegalensis, A. tropicalis, A. persici, A. nitrogenifigens, A. farinalis, A. fabarum, A. estunensis, A. syzygii, A. lovaniensis, A. okinawensis, A. orleanensis, A. oeni, A. pomorum, A. papayae, A. peroxydans, A. pasteurianus, A. sicerae, and A. lambici (Supplementary table S1). Interestingly, there were no similarity values greater than 99 %. The phylogenetic data obtained indicated that the isolate obviously constitutes a separate species within the genus Acetobacter.

In 16S-23S rRNA gene ITS sequences, the calculated pair-wise sequence similarity values of isolate AD25T were 83.7, 81.8, 84.0, 77.7, 82.0, 82.0, 83.0, 82.3, 82.3, 81.5, 79.9, 82.8, 83.2, 77.4, 80.8, 83.5, 82.0, 82.3, 76.9, 82.5, 77.7, 78.2, and 82.3 % as well, except for A. sicerae and A. lambici (Supplementary table S2). Similarly, the calculated pair-wise sequence similarity values of the isolate AD25T were somewhat high in groEL gene sequences; they were 87.6, 85.6, 87.8, 80.6, 84.5, 84.0, 83.9, 85.5, 85.4, 84.6, 79.4, 83.7, 83.8, 78.9, 82.4, 83.7, 82.4, 84.0, 80.8, 83.7, 81.9, 84.5, and 85.7 %, respectively (Supplementary table S3).

DNA base composition and DNA-DNA hybridization

The DNA base composition of isolate AD25T was 51.4 mol% G + C, which was lower in Group I or the A. aceti group. When single-stranded and labeled DNA from isolate AD25T was hybridized with DNA from test strains, the calculated DNA-DNA similarities were 100 ±0.04, 18.1 ±0.15, 17.6 ±0.1 and 6.7 ±0.1 %, respectively, to isolate AD25T, A. orientalis BCC 23127T, A. cibinongensis BCC 23126T , and A. tropicalis BCC 23123T, which were phylogenetically related. The labeled DNAs from A. orientalis BCC 23127T, A. cibinongensis BCC 23126T , and A. tropicalis BCC 23123T showed that the DNA-DNA similarities were 13.2 ±0.1, 100 ±0.003, 22.9 ±0.1, 5.5 ±0.1, 6.8 ±0.15, 18.7 ±0.1, 100 ±0.01, 5.3 ±0.1, 6.8 ±0.06, 14 ±0.06, 14.4 ±0.06, and 100 ±0.01 %, respectively. The genetic data obtained indicated that the isolate constitutes a separate species.

Phenotypic characteristics

Phenotypic and chemotaxonomic characteristics were described in the species description of the isolate.

Isolate AD25T was quite unique phenotypically (Table 2). In spite of being within Group I or the A. aceti group phylogenetically, the isolate was especially distinguisable from the type strains of A. cibinongensis and A. orientalis, which are phylogenetically related, by producing only D-gluconic acid, but not 2-keto-D-gluconic acid, from D-glucose (Table 2). The isolate was also discriminated from them by intense growth on GECA medium with 10 % ethanol and by weak growth on Frateur’s modified Hoyer medium with 3 % glucose and by intense acid production from D-mannose, D-galactose, and D-xylose. The weak acid production from melibiose also differentiated the isolate from the type strains of other Acetobacter, species except for A. orientalis and A. indonesiensis, which were distinguished from the isolate by the production of 2-keto-D-gluconic acid from D-glucose as well (Table 2).

Table2 Differential characteristics of Acetobacter thailandicus isolate AD25T

From the experimental results obtained above, the new species can therefore be introduced in the genus Acetobacter with the name, Acetobacter thailandicus sp. nov.

Description of Acetobacter thailandicus sp. nov

Acetobacter thailandicus (tha.i.lan’di.cus. N. L. masc. adj. thailandicus of Thailand, where the type strain was isolated).

Cells are Gram-negative and rod-shaped, measuring 1.0 × 1.6–2.6 μm and are non motile. Colonies are cream, smooth, glistening, non-pigmented, and raised with an entire margin on glucose/ethanol/calcium carbonate agar. Grows at pH 3.0 and 3.5 at 30 °C. No growth in the presence of 30 % D-glucose. Grows in the presence of 0.35 % acetic acid. Acetobacter thailandicus grows on GECA medium with 10 % ethanol and weakly on Frateur’s modified Hoyer medium with 3 % glucose, but not on the medium when 3.0 % D-glucose (the carbon source) was replaced by 3.0 % D-mannitol or by 3.0 % ethanol. Ethanol is oxidized to acetic acid by Acetobacter thailandicus and it also oxidizes acetate and lactate to carbon dioxide and water. Acetic acid is produced on ethanol/calcium carbonate agar. Catalase is positive, and oxidase is negative. D-Gluconic acid is produced from D-glucose. Acetobacter thailandicus is unable to produce 2-keto-D-gluconic acid, 5-keto-D-gluconic acid, and 2,5-diketo-D-gluconic acid. Acetobacter thailandicus facilitates no production of dihydroxyacetone from glycerol. Acid is produced from D-glucose, D-mannose, D-galactose, D-xylose, L-arabinose (weakly positive), D-ribose (very weakly positive), melibiose (very weakly positive), ethanol, and 1-butanol, but not from D-fructose, L-sorbose, D-arabinose, L-rhamnose, dulcitol, glycerol, methanol, trehalose, sucrose, raffinose, and starch. The major ubiquinone is Q-9. DNA G + C content is 51.4 mol% G-+ C.

The type strain is isolate AD25T (= BCC 15839T = NBRC 103583T), which was isolated from a flower of the blue trumpet vine (Thunbergia laurifolia) at Tong Pha Phum, Kanchanaburi, Thailand.

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Acknowledgments

This work was supported financially by the Strategic Scholarship/Fellowships Research Network from the Office of the Higher Education Commission, Ministry of Education (Grant no. 82/2549). Sincere thanks are also due to Mr. Richard James Goldrick, Department of Foreign Languages, Kasetsart University for English editing of this manuscript. A part of this work was carried out through collaboration of the Core to Core Program supported by the Japan Society for the Promotion of Science (JSPS) and the National Research Council of Thailand (NRCT).

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Pitiwittayakul, N., Yukphan, P., Chaipitakchonlatarn, W. et al. Acetobacter thailandicus sp. nov., for a strain isolated in Thailand. Ann Microbiol 65, 1855–1863 (2015). https://doi.org/10.1007/s13213-014-1024-7

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