OXIDATIVE PATHWAY FOR THE BIODEGRADATION OF NITROBENZENE BY COMAMONAS SP STRAIN JS']JS765

被引:129
作者
NISHINO, SF [1 ]
SPAIN, JC [1 ]
机构
[1] AL, EQC, TYNDALL AFB, FL 32403 USA
关键词
D O I
10.1128/AEM.61.6.2308-2313.1995
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Previous studies have shown that the biodegradation of nitrobenzene by Pseudomonas pseudoalcaligenes JS45 proceeds by the reduction of nitrobenzene through nitrosobenzene and hydroxylaminobenzene, followed by rearrangement to 2-aminophenol, which then undergoes meta ring cleavage, We report here the isolation of a Comamonas sp. that uses an oxidative pathway for the complete mineralization of nitrobenzene. The isolate, designated strain JS765, uses nitrobenzene as a sole source of carbon, nitrogen, and energy, Nitrobenzene-grown cells oxidized nitrobenzene, with the stoichiometric release of nitrite, Extracts of nitrobenzene-grown JS765 showed high levels of catechol 2,3-dioxygenase activity that were not abolished by heating the cell extracts to 60 degrees C for 10 min, The ring cleavage product had an absorbance maximum at 375 nm, consistent, with that of 2-hydroxymuconic semialdehyde. Both NAD-dependent dehydrogenase and NAD-independent hydrolase activities towards 2-hydroxymuconic semialdehyde were induced in extracts of nitrobenzene-grown cells. Catechol accumulated in the reaction mixture when cells preincubated with 3-chlorocatechol were incubated with nitrobenzene. Conversion of nitrobenzene to catechol by induced cells in the presence of 3-chlorocatechol and O-18(2), demonstrated the simultaneous incorporation of two atoms of oxygen, which indicated that the initial reaction was dioxygenation. The results indicate that the catabolic pathway involves an initial dioxygenase attack on nitrobenzene with the release of nitrite and formation of catechol, which is subsequently degraded by a meta cleavage pathway.
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页码:2308 / 2313
页数:6
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