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Biodegradation of 1-nitropyrene.

M A Heitkamp¹, J P Freeman, D W Miller

¹National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR 72079.

Archives of Microbiology

|January 1, 1991

Summary

A specific Mycobacterium bacterium effectively metabolizes 1-nitropyrene, a pollutant found in oil-contaminated sediments. This finding suggests potential for bioremediation of contaminated waste sites using this microbial pathway.

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Area of Science:

Environmental microbiology
Bioremediation
Polycyclic aromatic hydrocarbon (PAH) metabolism

Background:

1-Nitropyrene is a common pollutant in oil-contaminated environments.
Understanding its degradation pathways is crucial for effective bioremediation strategies.

Purpose of the Study:

To investigate the metabolism of 1-nitropyrene in estuarine sediments and by a specific Mycobacterium species.
To identify key metabolites and assess the potential of Mycobacterium sp. for bioremediation.

Main Methods:

Use of 14C-labeled 1-nitropyrene in microcosms with estuarine sediments and pure Mycobacterium cultures.
Analysis of degradation products using high-pressure liquid chromatography (HPLC), UV-visible, mass spectrometry, and NMR.
Time-course studies under aerobic and anaerobic conditions.

Main Results:

Mycobacterium sp. metabolized 1-nitropyrene, forming cis-9,10- and 4,5-dihydrodiols as major metabolites.
1-Nitropyrene degradation was slow in estuarine sediments (<1% mineralization in 8 weeks).
Anaerobic conditions led to reduction of the nitro group to form 1-aminopyrene.

Conclusions:

The studied Mycobacterium species demonstrates significant potential for metabolizing 1-nitropyrene.
Bioremediation of 1-nitropyrene using this bacterium is a promising approach for contaminated waste sites.

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