Publications by authors named "Masatoshi Nishita"

3 Publications

  • Page 1 of 1

Bacillus fermenti sp. nov., an indigo-reducing obligate alkaliphile isolated from indigo fermentation liquor for dyeing.

Int J Syst Evol Microbiol 2018 Apr 16;68(4):1123-1129. Epub 2018 Feb 16.

Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8571, Japan.

The indigo-reducing, facultatively anaerobic and obligately alkaliphilic strains Bf-1, Bf-2 and Bf-4 were isolated from an indigo fermentation liquor used for dyeing, which uses sukumo [composted Polygonum indigo (Polygonum tinctorium Lour.) leaves] as a basic ingredient and was obtained from a craft centre in Date City, Hokkaido, Japan. The 16S rRNA gene sequence analyses indicated that the closest neighbours of strain Bf-1 are Bacillus maritimus DSM 100413 (98.3 % 16S rRNA gene sequence similarity), Bacillus persicus DSM 25386 (98.2 %) and Bacillus rigiliprofundi LMG 28275 (97.7 %). The 16S rRNA gene sequence of strain Bf-1 was almost identical to the sequences of strains Bf-2 and Bf-4 (99.9 %). Cells of strain Bf-1 stained Gram-positive and formed straight rods that achieved motility through a pair of subpolar flagella. Strain Bf-1 grew at temperatures of between 15 and 45 °C with optimum growth at 33‒40 °C. The strain grew in the pH range of pH 8‒12, with optimum growth at pH 10. The isoprenoid quinone detected was menaquinone-7 (MK-7), and the DNA G+C content was 41.7 %. The whole-cell fatty acid profile mainly (>10 %) consisted of iso-C15 : 0 and iso-C16 : 0. Phylogenetically related neighbours, although demonstrating high 16S rRNA gene sequence similarity (>97.6 %) with strain Bf-1, exhibited less than 9 % relatedness in DNA-DNA hybridization experiments. Based on evidence from this polyphasic study, the isolates represent a novel species, for which the name Bacillus fermenti sp. nov. is proposed. The type strain of this species is Bf-1 (=JCM 31807=NCIMB 15079).
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1099/ijsem.0.002636DOI Listing
April 2018

Paralkalibacillus indicireducens gen., nov., sp. nov., an indigo-reducing obligate alkaliphile isolated from indigo fermentation liquor used for dyeing.

Int J Syst Evol Microbiol 2017 Oct 18;67(10):4050-4056. Epub 2017 Sep 18.

Laboratory of Molecular Environmental Microbiology, Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan.

Obligately alkaliphilic, indigo-reducing strains, designated Bps-1, Bps-2 and Bps-3, were isolated from an indigo fermentation liquor used for dyeing, which was produced from sukumo (composted Polygonum indigo leaves) obtained from a craft centre in Data City, Hokkaido, Japan, by using medium containing cellulase-treated sukumo. The 16S rRNA gene sequence phylogeny suggested that Bps-1 has a distinctive position among the alkaliphilic species of the genus Bacillus, with its closest neighbours being Bacillus pseudofirmus DSM 8715, Bacillus lindianensis DSM 26864 and Bacillus alcalophilus DSM 485 (96.1, 95.8 and 95.5 % 16S rRNA gene sequence similarities, respectively). The 16S rRNA sequence of strain Bps-1 was identical to those of strains Bps-2 and Bps-3. Cells of the novel isolate were Gram-stain-positive and were facultatively anaerobic straight rods that were motile by means of a pair of flagella (subpolar and centre sides). Spherical endospores were formed in the terminal position. Strain Bps-1 grew between 18 and 40 °C with optimum growth at 33 °C. The isolate grew in the pH range 8‒11, with optimum growth at pH 9‒10. The isoprenoid quinone detected was menaquinone-7 (MK-7), and the DNA G+C content was 40.3 %. The whole-cell fatty acid profile (>10 %) mainly consisted of anteiso-C15 : 0, iso-C15 : 0 and C16 : 0. On the basis of the phenotypic, chemotaxonomic and phylogenetic data, the isolates represent a novel species of a novel genus, for which the name Paralkalibacillus indicireducens gen. nov., sp. nov. is proposed. The type strain of this species is Bps-1 (JCM 31808=NCIMB 15080), with strains Bps-2 and Bps-3 representing additional strains of the species.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1099/ijsem.0.002248DOI Listing
October 2017

Development of media to accelerate the isolation of indigo-reducing bacteria, which are difficult to isolate using conventional media.

World J Microbiol Biotechnol 2017 Jul 5;33(7):133. Epub 2017 Jun 5.

Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukisamu-Higashi, Toyohira-ku, Sapporo, 062-8517, Japan.

Indigo-reducing bacteria perform natural fermentation in indigo fermentation fluid. Owing to the stochastic nature of the process, the constituent in indigo fermentation fluid differ depending on the prepared batch and fermentation period. To identify new indigo-reducing bacteria, isolation of the bacteria is indispensable. However, isolation of indigo-reducing bacteria is difficult because conventional media are often unsuitable to isolate these slow-growing bacteria that also exist in low numbers. Hydrolysates of polysaccharides and mixtures of plant base constituents are candidates to accelerate the isolation of indigo-reducing bacteria that cannot be isolated using conventional media. In this current study, wheat bran hydrolysate and composted indigo leaves (sukumo) were used as ingredients in the fermentation fluid in the selective medium for indigo-reducing bacteria in anaerobic culture. The results suggested that obligate and oxygen-non-metabolizing facultative anaerobes are difficult to isolate using conventional media, whereas oxygen-metabolizing facultative anaerobes, relatively rapid-growing and major bacterial strains are relatively easy to isolate. Media containing sukumo hydrolysate facilitated the isolation of novel species of Bacillus pseudofirmus-related strains, whereas media containing wheat bran hydrolysate facilitated the isolation of Amphibacillus spp. (including new species). Seven species (including two new species) of indigo-reducing bacteria were isolated using wheat bran hydrolysate-containing media, whereas six species (including three new species) of indigo-reducing bacteria were isolated using media containing both wheat bran and sukumo hydrolysates. These newly developed culture media will facilitate the isolation of unknown bacteria in indigo fermentation and in environments similar to indigo fermentation fluid.
View Article and Find Full Text PDF

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11274-017-2300-zDOI Listing
July 2017
-->