Serveur d'exploration sur le phanerochaete

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Degradation of 4,4'-dichlorobiphenyl, 3,3',4,4'-tetrachlorobiphenyl, and 2,2',4,4',5,5'-hexachlorobiphenyl by the white rot fungus Phanerochaete chrysosporium.

Identifieur interne : 000D13 ( Main/Exploration ); précédent : 000D12; suivant : 000D14

Degradation of 4,4'-dichlorobiphenyl, 3,3',4,4'-tetrachlorobiphenyl, and 2,2',4,4',5,5'-hexachlorobiphenyl by the white rot fungus Phanerochaete chrysosporium.

Auteurs : D. Dietrich [États-Unis] ; W J Hickey ; R. Lamar

Source :

RBID : pubmed:8526503

Descripteurs français

English descriptors

Abstract

The white rot fungus Phanerochaete chrysosporium has demonstrated abilities to degrade many xenobiotic chemicals. In this study, the degradation of three model polychlorinated biphenyl (PCB) congeners (4,4'-dichlorobiphenyl [DCB], 3,3',4,4'-tetrachlorobiphenyl, and 2,2',4,4',5,5'-hexachlorobiphenyl) by P. chrysosporium in liquid culture was examined. After 28 days of incubation, 14C partitioning analysis indicated extensive degradation of DCB, including 11% mineralization. In contrast, there was negligible mineralization of the tetrachloro- or hexachlorobiphenyl and little evidence for any significant metabolism. With all of the model PCBs, a large fraction of the 14C was determined to be biomass bound. Results from a time course study done with 4,4'-[14C]DCB to examine 14C partitioning dynamics indicated that the biomass-bound 14C was likely attributable to nonspecific adsorption of the PCBs to the fungal hyphae. In a subsequent isotope trapping experiment, 4-chlorobenzoic acid and 4-chlorobenzyl alcohol were identified as metabolites produced from 4,4'-[14C]DCB. To the best of our knowledge, this the first report describing intermediates formed by P. chrysosporium during PCB degradation. Results from these experiments suggested similarities between P. chrysosporium and bacterial systems in terms of effects of congener chlorination degree and pattern on PCB metabolism and intermediates characteristic of the PCB degradation process.

DOI: 10.1128/AEM.61.11.3904-3909.1995
PubMed: 8526503
PubMed Central: PMC167696


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Le document en format XML

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<title xml:lang="en">Degradation of 4,4'-dichlorobiphenyl, 3,3',4,4'-tetrachlorobiphenyl, and 2,2',4,4',5,5'-hexachlorobiphenyl by the white rot fungus Phanerochaete chrysosporium.</title>
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<term>Mass Spectrometry (MeSH)</term>
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<term>Polluants environnementaux (métabolisme)</term>
<term>Polychlorobiphényles (composition chimique)</term>
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<div type="abstract" xml:lang="en">The white rot fungus Phanerochaete chrysosporium has demonstrated abilities to degrade many xenobiotic chemicals. In this study, the degradation of three model polychlorinated biphenyl (PCB) congeners (4,4'-dichlorobiphenyl [DCB], 3,3',4,4'-tetrachlorobiphenyl, and 2,2',4,4',5,5'-hexachlorobiphenyl) by P. chrysosporium in liquid culture was examined. After 28 days of incubation, 14C partitioning analysis indicated extensive degradation of DCB, including 11% mineralization. In contrast, there was negligible mineralization of the tetrachloro- or hexachlorobiphenyl and little evidence for any significant metabolism. With all of the model PCBs, a large fraction of the 14C was determined to be biomass bound. Results from a time course study done with 4,4'-[14C]DCB to examine 14C partitioning dynamics indicated that the biomass-bound 14C was likely attributable to nonspecific adsorption of the PCBs to the fungal hyphae. In a subsequent isotope trapping experiment, 4-chlorobenzoic acid and 4-chlorobenzyl alcohol were identified as metabolites produced from 4,4'-[14C]DCB. To the best of our knowledge, this the first report describing intermediates formed by P. chrysosporium during PCB degradation. Results from these experiments suggested similarities between P. chrysosporium and bacterial systems in terms of effects of congener chlorination degree and pattern on PCB metabolism and intermediates characteristic of the PCB degradation process.</div>
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<Reference>
<Citation>Can J Microbiol. 1973 Jan;19(1):47-52</Citation>
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<ArticleId IdType="pubmed">4685335</ArticleId>
</ArticleIdList>
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<Reference>
<Citation>Bull Environ Contam Toxicol. 1976 Jun;15(6):768-74</Citation>
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<ArticleId IdType="pubmed">820390</ArticleId>
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<Reference>
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</Reference>
<Reference>
<Citation>J Bacteriol. 1994 Aug;176(16):4838-44</Citation>
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<Reference>
<Citation>Appl Environ Microbiol. 1986 Apr;51(4):761-8</Citation>
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<ArticleId IdType="pubmed">3085588</ArticleId>
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<Reference>
<Citation>FEBS Lett. 1988 Aug 29;236(2):309-11</Citation>
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<ArticleId IdType="pubmed">3925550</ArticleId>
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