Degradation of chloronitrobenzenes by a coculture of Pseudomonas putida and a Rhodococcus sp.
A single microorganism able to mineralize chloronitrobenzenes (CNBs) has not been reported, and degradation of CNBs by coculture of two microbial strains was attempted. Pseudomonas putida HS12 was first isolated by analogue enrichment culture using nitrobenzene (NB) as the substrate, and this strain was observed to possess a partial reductive pathway for the degradation of NB. From high-performance liquid chromatography-mass spectrometry and 1H nuclear magnetic resonance analyses, NB-grown cells of P. putida HS12 were found to convert 3- and 4-CNBs to the corresponding 5- and 4-chloro-2-hydroxyacetanilides, respectively, by partial reduction and subsequent acetylation. For the degradation of CNBs, Rhodococcus sp. strain HS51, which degrades 4- and 5-chloro-2-hydroxyacetanilides, was isolated and combined with P. putida HS12 to give a coculture. This coculture was confirmed to mineralize 3- and 4-CNBs in the presence of an additional carbon source. A degradation pathway for 3- and 4-CNBs by the two isolated strains was also proposed.
Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, Korea.
H S
HS
Park
S J
SJ
Lim
Y K
YK
Chang
A G
AG
Livingston
H S
HS
Kim
D000107:Acetylation; D001673:Biodegradation, Environmental; D002851:Chromatography, High Pressure Liquid; D018920:Coculture Techniques; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D009578:Nitrobenzenes / Q000378:metabolism*; D010084:Oxidation-Reduction; D016958:Pseudomonas putida / Q000254:growth & development* / Q000302:isolation & purification / Q000378:metabolism*; D012240:Rhodococcus / Q000254:growth & development* / Q000302:isolation & purification / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000378:metabolism
D009578:Nitrobenzenes; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical