Location: Crop Bioprotection ResearchTitle: Bacillus paralicheniformis sp. nov., isolated from fermented soybean paste
|Kwon, Soon-wo - National Academy Of Agricultural Science|
|Rooney, Alejandro - Alex|
|Kim, Soo-jin - National Academy Of Agricultural Science|
Submitted to: International Journal of Systematic and Evolutionary Microbiology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/6/2015
Publication Date: 10/1/2015
Publication URL: http://handle.nal.usda.gov/10113/62316
Citation: Dunlap, C.A., Kwon, S.W., Rooney, A.P., Kim, S.J. 2015. Bacillus paralicheniformis sp. nov., isolated from fermented soybean paste. International Journal of Systematic and Evolutionary Microbiology. 65(10):3487-3492.
Interpretive Summary: This study describes a new bacterial species that was isolated from fermented soybean paste. Novel bacteria may possess unique and unusual biochemical properties that make them attractive candidates to explore their potential for new uses in agriculture or biotechnology. As such, this strain was accessioned into the Crop Bioprotection Research Unit’s culture collection where its potential for agricultural applications can be assessed in future studies.
Technical Abstract: An isolate of a Gram-positive, facultatively anaerobic, motile, rod-shaped, endospore forming bacterium was recovered from soybean-based fermented paste. It was isolated from cheonggukjang, a Korean fermented soybean food product. Phylogenetic analysis of the 16S rRNA gene indicated that the strain was most closely related to Bacillus sonorensis KCTC-13918**T (99.5 %) and Bacillus licheniformis DSM 13**T (99.4 %). In phenotypic characterization, the novel strain was found to grow between 15-60 deg C and to tolerate up to 10% NaCl (w/v). Furthermore, the strains grew in media with pH 6 to 11 (optimal growth at pH 7.0–8.0). The predominant cellular fatty acids were anteiso-C15:0 (37.7%) and iso-C15:0 (31.5'%). The predominant isoprenoid quinone was menaquinone 7 (MK-7). The cell-wall peptidoglycan contained meso-diaminopimelic acid. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine and an unknown glycolipid. A draft genome of the strain was completed and used for phylogenetic analysis and comparisons to close relatives. The DNA G+C content was 45.9 mol%. In addition, to forming a distinct monophyletic cluster in phylogenetic analysis of gene sequence data, the strain differed from the two most closely related species in that it produces bacitracin, fengycin, a lantipeptide and does not produce lichenicidin. The strains also contained a 9 gene urease cluster and possessed urease activity, not found in closely related species. A phylogenomic analysis of all published genomes of species in the Bacillus licheniformis group revealed that strains belonging to B. licheniformis clustered into two distinct groups, with group 1 consisting of B. licheniformis DSM 13**T and 11 other strains and group 2 consisting of KJ-16**T and 4 other strains. This was consistent with other recent B. licheniformis genotyping studies, which showed that it forms at least two distinct groups. Strain KJ-16 and another strain from group 2 were subsequently characterized using a polyphasic taxonomic approach and compared to two strains from group 1 and other type strains of closely related Bacillus species. Based upon the consensus of phylogenetic and phenotypic analyses, we conclude that this strain represents a novel species within the genus Bacillus, for which the name Bacillus paralicheniformis sp. nov. is proposed, with type strain KJ-16**T (=KACC 18426**T, = NRRL B-65293**T)