title: Isolation and characterization of antifungal peptides produced by Bacillus amyloliquefaciens LBM5006.
abstract: Bacillus amyloliquefaciens LBM 5006 produces antagonistic activity against pathogenic bacteria and phytopathogenic fungi, including Aspergillus spp., Fusarium spp., and Bipolaris sorokiniana. PCR analysis revealed the presence of ituD, but not sfp genes, coding for iturin and surfactin, respectively. The antimicrobial substance produced by this strain was isolated by ammonium sulfate precipitation, gel filtration chromatography and 1-butanol extraction. The ultraviolet spectrum was typical of a polypeptide and the infrared spectrum indicates the presence of peptide bonds and acyl group(s). The antimicrobial substance was resistant to proteolytic enzymes and heat treatment, and was reactive with ninhydrin. Mass spectroscopy analysis indicated that B. amyloliquefaciens LBM 5006 produces two antimicrobial peptides, with main peaks at m/z 1,058 Da and 1,464 Da, corresponding to iturin-like and fengycin-like peptides, respectively. B. amyloliquefaciens LBM 5006 showed significant activity against phytopatogenic fungi, showing potential for use as a biocontrol agent or production of antifungal preparations.
authors.affiliation: Laboratório de BioquÍmica e Microbiologia Aplicada, Departamento de Ciência de Alimentos, ICTA, Universidade Federal do Rio Grande do Sul, 91501-970, Porto Alegre, Brazil.
authors.forename: Lisianne Brittes
authors.initials: LB
authors.lastname: Benitez
authors.forename: Renata Voltolini
authors.initials: RV
authors.lastname: Velho
authors.forename: Marcia Pagno
authors.initials: MP
authors.lastname: Lisboa
authors.forename: Luis Fernando da Costa
authors.initials: LF
authors.lastname: Medina
authors.forename: Adriano
authors.initials: A
authors.lastname: Brandelli
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D001407:Bacillus / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D005591:Chemical Fractionation; D002850:Chromatography, Gel; D005658:Fungi / Q000187:drug effects; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010455:Peptides / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*; D017422:Sequence Analysis, DNA; D013057:Spectrum Analysis
chemical_list: D000935:Antifungal Agents; D010455:Peptides