title: Oil biodegradation by Bacillus strains isolated from the rock of an oil reservoir located in a deep-water production basin in Brazil.
abstract: Sixteen spore forming Gram-positive bacteria were isolated from the rock of an oil reservoir located in a deep-water production basin in Brazil. These strains were identified as belonging to the genus Bacillus using classical biochemical techniques and API 50CH kits, and their identity was confirmed by sequencing of part of the 16S rRNA gene. All strains were tested for oil degradation ability in microplates using Arabian Light and Marlin oils and only seven strains showed positive results in both kinds of oils. They were also able to grow in the presence of carbazole, n-hexadecane and polyalphaolefin (PAO), but not in toluene, as the only carbon sources. The production of key enzymes involved with aromatic hydrocarbons biodegradation process by Bacillus strains (catechol 1,2-dioxygenase and catechol 2,3-dioxygenase) was verified spectrophotometrically by detection of cis,cis-muconic acid and 2-hydroxymuconic semialdehyde, and results indicated that the ortho ring cleavage pathway is preferential. Furthermore, polymerase chain reaction (PCR) products were obtained when the DNA of seven Bacillus strains were screened for the presence of catabolic genes encoding alkane monooxygenase, catechol 1,2-dioxygenase, and/or catechol 2,3-dioxygenase. This is the first study on Bacillus strains isolated from an oil reservoir in Brazil.
authors.affiliation: Departamento de Microbiologia Geral, Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Bloco I, Ilha do Fundão, CEP 21941-590, Rio de Janeiro-RJ, Brazil.
authors.forename: Claudia Duarte
authors.initials: CD
authors.lastname: da Cunha
authors.forename: Alexandre S
authors.initials: AS
authors.lastname: Rosado
authors.forename: Gina V
authors.initials: GV
authors.lastname: Sebastián
authors.forename: Lucy
authors.initials: L
authors.lastname: Seldin
authors.forename: Irene
authors.initials: I
authors.lastname: von der Weid
mesh_terms: D000473:Alkanes / Q000378:metabolism; D001267:Atlantic Ocean; D001407:Bacillus / Q000145:classification / Q000166:cytology / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001426:Bacterial Proteins / Q000032:analysis / Q000235:genetics; D015373:Bacterial Typing Techniques; D001673:Biodegradation, Environmental; D001938:Brazil; D002227:Carbazoles / Q000378:metabolism; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D004798:Enzymes / Q000032:analysis / Q000235:genetics; D020459:Genes, rRNA; D019015:Geologic Sediments / Q000382:microbiology*; D008969:Molecular Sequence Data; D010578:Petroleum / Q000378:metabolism*; D010802:Phylogeny; D011090:Polyenes / Q000378:metabolism; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013171:Spores, Bacterial; D014050:Toluene / Q000378:metabolism
chemical_list: D000473:Alkanes; D001426:Bacterial Proteins; D002227:Carbazoles; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D004798:Enzymes; D010578:Petroleum; D011090:Polyenes; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; C041514:carbazole; D014050:Toluene; C035051:PL 732; C007932:n-hexadecane