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Meta-cleavage of Hydroxynaphthoic Acids in the Degradation of Phenanthrene by Sphingobium sp. strain PNB.
MedLine Citation:
PMID:  22194350     Owner:  NLM     Status:  Publisher    
Polycyclic aromatic hydrocarbons (PAHs) comprise of a group of priority organic pollutants that are toxic and/or carcinogenic. Phenanthrene, the simplest polyaromatic hydrocarbon among recognized priority pollutants, is commonly used as a model compound for the study of PAH biodegradation. Sphingobium sp. strain PNB, capable of degrading phenanthrene as a sole carbon and energy source, was isolated from a municipal waste-contaminated soil sample. A combination of chromatographic and spectrometric analyses, together with oxygen uptake and enzyme activity studies, suggested the presence of phenanthrene degradation pathways in the strain. Identification of metabolites suggested that initial dioxygenation of phenanthrene took place at both 3,4- and 1,2-carbon positions; meta-cleavage of resultant diols lead to the formation of 1-hydroxy-2-naphthoic acid and 2-hydroxy-1-naphthoic acid, respectively. The hydroxynaphthoic acids, in turn, were metabolized by meta-cleavage pathway(s), leading to the formation of 2,2-dicarboxychromene and 2-hydroxychromene-2-glyoxylic acid, respectively. These metabolites were subsequently transformed to catechol via salicylic acid, which further proceeds towards the tricarboxylic acid cycle leading to complete mineralization of the compound, phenanthrene. The present study establishes the metabolism of hydroxynaphthoic acids by a meta-cleavage pathway in the degradation of phenanthrene, expanding our current understanding of microbial degradation of PAHs.
Madhumita Roy; Pratick Khara; Tapan K Dutta
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-12-22
Journal Detail:
Title:  Microbiology (Reading, England)     Volume:  -     ISSN:  1465-2080     ISO Abbreviation:  -     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-12-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9430468     Medline TA:  Microbiology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Bose Institute.
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