期刊
CHEMOSPHERE
卷 219, 期 -, 页码 748-755出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.12.046
关键词
Polycyclic aromatic hydrocarbon; Acenaphthene; Biodegradation; Sphingobacterium sp.; 1-naphthoic acid; Trans-3-carboxy-2-hydroxybenzylidenepyruvic acid
资金
- University Grants Commission, India
A gram-negative bacterium designated as RTSB was isolated from a petroleum-contaminated soil competent of utilizing acenaphthene as the solitary source of carbon and energy. The strain RTSB was identified as a Sphingobacterium species based on the morphological, nutritional and biochemical features of the organism as well as 16S rRNA sequence analysis. By a combination of chromatographic and spectrometric techniques, different metabolites of the acenaphthene degradation pathway by the strain RTSB were isolated and identified, which indicate a novel acenaphthene degradation pathway involving 1-naphthoic acid. Characterization of different metabolites suggested transformation of acenaphthene to 1-naphthoic acid through 1-acenaphthenol, acenaphthenequinone and naphthalene-1,8-dicarboxylic acid in the upper pathway of degradation: while in the later, 1-naphthoic acid was processed via a novel meta-cleavage pathway, leading to the formation of trans-3-carboxy-2-hydroxybenzylidenepyruvic acid, and then to salicylic acid and catechol entering into the TCA cycle intermediates. This detailed study of acenaphthene degradation by a Sphingobacterium species describes a distinct pathway of acenaphthene degradation involving the novel metabolite trans-3-carboxy-2-hydroxybenzylidenepyruvic acid. (C) 2018 Elsevier Ltd. All rights reserved.
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