title: Isolation and characterization of a novel 2-sec-butylphenol-degrading bacterium Pseudomonas sp. strain MS-1.
abstract: A novel bacterium capable of utilizing 2-sec-butylphenol as the sole carbon and energy source, Pseudomonas sp. strain MS-1, was isolated from freshwater sediment. Within 30 h, strain MS-1 completely degraded 1.5 mM 2-sec-butylphenol in basal salt medium, with concomitant cell growth. A pathway for the metabolism of 2-sec-butylphenol by strain MS-1 was proposed on the basis of the identification of 3 internal metabolites-3-sec-butylcatechol, 2-hydroxy-6-oxo-7-methylnona-2,4-dienoic acid, and 2-methylbutyric acid-by gas chromatography-mass spectrometry analysis. Strain MS-1 degraded 2-sec-butylphenol through 3-sec-butylcatechol along a meta-cleavage pathway. Degradation experiments with various alkylphenols showed that the degradability of alkylphenols by strain MS-1 depended strongly on the position (ortho >> meta = para) of the alkyl substitute, and that strain MS-1 could degrade 2-alkylphenols with various sized and branched alkyl chain (o-cresol, 2-ethylphenol, 2-n-propylphenol, 2-isopropylphenol, 2-sec-butylphenol, and 2-tert-butylphenol), as well as a dialkylphenol (namely, 6-tert-butyl-m-cresol).
authors.affiliation: Muroran Institute of Technology, Muroran, Japan. tadashi@mmm.muroran-it.ac.jp
authors.forename: Tadashi
authors.initials: T
authors.lastname: Toyama
authors.forename: Noritaka
authors.initials: N
authors.lastname: Maeda
authors.forename: Manabu
authors.initials: M
authors.lastname: Murashita
authors.forename: Yong-Cheol
authors.initials: YC
authors.lastname: Chang
authors.forename: Shintaro
authors.initials: S
authors.lastname: Kikuchi
mesh_terms: D001673:Biodegradation, Environmental; D019015:Geologic Sediments / Q000382:microbiology*; D008969:Molecular Sequence Data; D010636:Phenols / Q000737:chemistry / Q000378:metabolism*; D010802:Phylogeny; D011549:Pseudomonas / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*
chemical_list: D010636:Phenols; C033932:2-sec-butylphenol
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