Biodegradation of p-nitrophenol via 1,2,4-benzenetriol by an Arthrobacter sp.
- Armstrong Lab., Tyndall Air Force Base, FL (United States)
- Univ. of Scranton, PA (United States)
The degradation of p-nitrophenol (PNP) by Moraxella and Pseudomonas spp. involves an initial monooxygenase-catalyzed removal of the nitro group. The resultant hydroquinone is subject to ring fission catalyzed by a dioxygenase enzyme. A strain of an Arthrobacter sp. JS443, capable of degrading PNP with stoichiometric release of nitrite has been isolated. During induction of the enzymes required for growth on PNP, 1,2,4-benzenetriol was identified as an intermediate by gas chromatography-mass spectroscopy and radiotracer studies. 1,2,4-Benzenetriol was converted to maleylacetic acid, which was further degraded by the beta-ketoadipate pathway. Conversion of PNP to 1,2,4-benzenetriol is catalyzed by a monooxygenase system in strain JS443 through the formation of 4-nitrocatechol, 4-nitroresorcinol, or both. Results clearly indicate the existence of an alternative pathway for the biodegradation of PNP. 15 refs, 2 figs., 2 tabs.
- OSTI ID:
- 111370
- Journal Information:
- Applied and Environmental Microbiology, Vol. 60, Issue 8; Other Information: PBD: Aug 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
A two-component monooxygenase catalyzes both the hydroxylation of p-nirophenol and the oxidative release of nitrite from 4-nitrocatechol in Bacillus sphaericus JS905
Degradation and induction specificity in actinomycetes that degrade p-nitrophenol