Degradation of 2,4,6-trichlorophenol by Phanerochaete chrysosporium: involvement of reductive dechlorination.

Abstract:

:Under secondary metabolic conditions, the lignin-degrading basidiomycete Phanerochaete chrysosporium mineralizes 2,4, 6-trichlorophenol. The pathway for the degradation of 2,4, 6-trichlorophenol has been elucidated by the characterization of fungal metabolites and oxidation products generated by purified lignin peroxidase (LiP) and manganese peroxidase (MnP). The multistep pathway is initiated by a LiP- or MnP-catalyzed oxidative dechlorination reaction to produce 2,6-dichloro-1,4-benzoquinone. The quinone is reduced to 2,6-dichloro-1,4-dihydroxybenzene, which is reductively dechlorinated to yield 2-chloro-1,4-dihydroxybenzene. The latter is degraded further by one of two parallel pathways: it either undergoes further reductive dechlorination to yield 1, 4-hydroquinone, which is ortho-hydroxylated to produce 1,2, 4-trihydroxybenzene, or is hydroxylated to yield 5-chloro-1,2, 4-trihydroxybenzene, which is reductively dechlorinated to produce the common key metabolite 1,2,4-trihydroxybenzene. Presumably, the latter is ring cleaved with subsequent degradation to CO2. In this pathway, the chlorine at C-4 is oxidatively dechlorinated, whereas the other chlorines are removed by a reductive process in which chlorine is replaced by hydrogen. Apparently, all three chlorine atoms are removed prior to ring cleavage. To our knowledge, this is the first reported example of aromatic reductive dechlorination by a eukaryote.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Reddy GV,Gelpke MD,Gold MH

doi

10.1128/JB.180.19.5159-5164.1998

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

5159-64

issue

19

eissn

0021-9193

issn

1098-5530

journal_volume

180

pub_type

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