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Appl. Environ. Microbiol., 10 1995, 3711-3723, Vol 61, No. 10
M Grifoll, SA Selifonov, CV Gatlin and PJ Chapman
Pseudomonas cepacia F297 grew with fluorene as a sole source of carbon and
energy; its growth yield corresponded to an assimilation of about 40% of
fluorene carbon. The accumulation of a ring meta-cleavage product during
growth and the identification of 1-indanone in growth media and washed-cell
suspensions suggest that strain F297 metabolizes fluorene by mechanisms
analogous to those of naphthalene degradation. In addition to fluorene,
strain F297 utilized for growth a wide variety of polycyclic aromatic
compounds (PACs), including naphthalene, 2,3- dimethylnaphthalene,
phenanthrene, anthracene, and dibenzothiophene. Fluorene-induced cells of
the strain also transformed 2,6- dimethylnaphthalene, biphenyl,
dibenzofuran, acenaphthene, and acenaphthylene. The identification of
products formed from those substrates (by gas chromatography-mass
spectrometry) in washed-cell suspensions indicates that P. cepacia F297
carries out the following reactions: (i) aromatic ring oxidation and
cleavage, apparently using the pyruvate released for growth, (ii) methyl
group oxidations, (iii) methylenic oxidations, and (iv) S oxidations of
aromatic sulfur heterocycles. Strain F297 grew with a creosote-PAC mixture,
producing an almost complete removal of all aromatic compounds containing 2
to 3 rings in 14 days, as demonstrated by gas chromatography analysis of
the remaining PACs recovered from cultures. The identification of key
chemicals confirmed that not only are certain compounds depleted but also
the anticipated reaction products are found.
Copyright © 1995, American Society for Microbiology
Actions of a versatile fluorene-degrading bacterial isolate on polycyclic aromatic compounds
Departament de Microbiologia, Universitat de Barcelona, Spain.
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