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- W2000744144 abstract "Catabolic pathways for utilization of naphthalene (NAP), anthracene (ANT), phenanthrene (PHE), and fluoranthene (FLA) by Sphingomonas paucimobilis EPA505 were identified. Accumulation of catabolic intermediates was investigated with three classes of Tn5 mutants with the following polycyclic aromatic hydrocarbon (PAH)-negative phenotypes; (class I NAP− PHE− FLA−, class II NAP− PHE−, and class III FLA−). Class I mutant 200pbhA had a Tn5 insertion within a meta ring fission dioxygenase (pbhA), and a ferredoxin subunit gene (pbhB) resided directly downstream. Mutant 200pbhA and other class I mutants lost the ability to catalyze the initial dihydroxylation step and did not transform NAP, ANT, PHE, or FLA. Class I mutant 401 accumulated salicylic acid, 2-hydroxy-3-naphthoic acid, 1-hydroxy-2-naphthoic acid, and hydroxyacenaphthoic acid during incubation with NAP, ANT, PHE, or FLA, respectively. Class II mutant 132pbhC contained the Tn5 insertion in an aldolase hydratase (pbhC) and accumulated what appeared to be meta ring fission products: trans-o-hydroxybenzylidene pyruvate, trans-o-hydroxynaphylidene pyruvate, and trans-o-hydroxynaphthyl-oxobutenoic acid when incubated with NAP, ANT, and PHE, respectively. When mutant 132pbhC was incubated with 1-hydroxy-2-naphthoic acid, it accumulated trans-o-hydroxybenzylidene pyruvate. Class III mutant 104ppdk had a Tn5 insertion in a pyruvate phosphate dikinase gene that affected expression of a FLA-specific gene and accumulated a proposed meta ring fission product; trans-o-hydroxyacenaphyl-oxobutenoic acid during incubation with FLA. Trans-o-hydroxyacenaphyl-oxobutenoic acid was degraded to acenaphthenone that accumulated with class III mutant 611. Acenaphthenone was oxidized via incorporation of one molecule of dioxygen by another oxygenase. 2,3-Dihydroxybenzoic acid was the final FLA-derived catabolic intermediate detected. Analysis of PAH utilization mutants revealed that there are convergent and divergent points involved in NAP, ANT, PHE, and FLA utilization by S. paucimobilis EPA505. Journal of Industrial Microbiology & Biotechnology (2001) 26, 369–382." @default.
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- W2000744144 date "2001-06-01" @default.
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- W2000744144 title "Convergent and divergent points in catabolic pathways involved in utilization of fluoranthene, naphthalene, anthracene, and phenanthrene by Sphingomonas paucimobilis var. EPA505" @default.
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- W2000744144 doi "https://doi.org/10.1038/sj.jim.7000149" @default.
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