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http://dx.doi.org/10.48022/mbl.2011.11005

Complete Genome Sequence and Antimicrobial Activities of Bacillus velezensis MV2 Isolated from a Malva verticillate Leaf  

Lee, Hyeonju (Department of Microbiology, College of Natural Sciences, Pusan National University)
Jo, Eunhye (Department of Microbiology, College of Natural Sciences, Pusan National University)
Kim, Jihye (Department of Microbiology, College of Natural Sciences, Pusan National University)
Moon, Keumok (Department of Microbiology, College of Natural Sciences, Pusan National University)
Kim, Min Ji (School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University)
Shin, Jae-Ho (School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University)
Cha, Jaeho (Department of Microbiology, College of Natural Sciences, Pusan National University)
Publication Information
Microbiology and Biotechnology Letters / v.49, no.1, 2021 , pp. 111-119 More about this Journal
Abstract
A bacterial strain isolated from a Malva verticillata leaf was identified as Bacillus velezensis MV2 based on the 16S rRNA sequencing results. Complete genome sequencing revealed that B. velezensis MV2 possessed a single 4,191,702-bp contig with 45.57% GC content. Generally, Bacillus spp. are known to produce diverse antimicrobial compounds including bacteriocins, polyketides, and non-ribosomal peptides. Antimicrobial compounds in the B. velezensis MV2 were extracted from culture supernatants using hydrophobic interaction chromatography. The crude extracts showed antimicrobial activity against both gram-positive bacteria and gram-negative bacteria; however, they were more effective against gram-positive bacteria. The extracts also showed antifungal activity against phytopathogenic fungi such as Fusarium fujikuroi and F. graminearum. In time-kill assays, these antimicrobial compounds showed bactericidal activity against Bacillus cereus, used as indicator strain. To predict the type of antimicrobial compounds produced by this strain, we used the antiSMASH algorithm. Forty-seven secondary metabolites were predicted to be synthesized in MV2, and among them, fourteen were identified with a similarity of 80% or more with those previously identified. Based on the antimicrobial properties, the antimicrobial compounds may be nonribosomal peptides or polyketides. These compounds possess the potential to be used as biopesticides in the food and agricultural industry as an alternative to antibiotics.
Keywords
Bacillus velezensis; antibacterial activity; antifungal activity; Malva verticillata; whole genome sequence;
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