title: Revision of the taxonomic position of the xylanolytic Bacillus sp. MIR32 reidentified as Bacillus halodurans and plasmid-mediated transformation of B. halodurans.
abstract: Bacillus sp. MIR32 has been isolated using xylan as the only carbon source, and one of its xylanolytic enzymes has been extensively studied. Biochemical analysis first related this strain to Bacillus amyloliquefaciens, but further studies based on a comparison of 16S rDNA sequences, G+C content, and DNA-DNA hybridization showed that strain MIR32 should be classified as a member of the species Bacillus halodurans. This change is also supported by the typical phenotype observed and by the results of PCR amplification directed toward spacers in rDNA and tDNA genes, which were assayed and compared with those of B. halodurans DSM 497(T). Although among alkaliphilic bacilli competence development has not been experimentally demonstrated, in this work both B. halodurans MIR32 and DSM 497(T) were transformed according to a simple procedure developed in our laboratory, reaching 10(2)-10(3) stable transformants per microgram of plasmid DNA.
authors.affiliation: PROIMI Planta Piloto de Procesos Industriales Microbiológicos, Av. Belgrano y Pasaje Caseros, 4000 San Miguel de Tucumán, Tucumán, Argentina. ale_martinez@yahoo.com
authors.forename: M Alejandra
authors.initials: MA
authors.lastname: Martínez
authors.forename: Osvaldo D
authors.initials: OD
authors.lastname: Delgado
authors.forename: Javier D
authors.initials: JD
authors.lastname: Breccia
authors.forename: Mario D
authors.initials: MD
authors.lastname: Baigorí
authors.forename: Faustino
authors.initials: F
authors.lastname: Siñeriz
mesh_terms: D001407:Bacillus / Q000145:classification* / Q000235:genetics / Q000378:metabolism; D001482:Base Composition; D004269:DNA, Bacterial / Q000235:genetics; D021901:DNA, Intergenic / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D006863:Hydrogen-Ion Concentration; D009693:Nucleic Acid Hybridization; D010957:Plasmids / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012338:RNA, Ribosomal, 23S / Q000235:genetics; D012343:RNA, Transfer / Q000235:genetics; D013045:Species Specificity; D014169:Transformation, Bacterial; D014990:Xylans / Q000378:metabolism*
chemical_list: D004269:DNA, Bacterial; D021901:DNA, Intergenic; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D012338:RNA, Ribosomal, 23S; D014990:Xylans; D012343:RNA, Transfer