Role of nitrogen oxides in the metabolism of ammonia-oxidizing bacteria

被引：28

作者：

Kampschreur, MJ ^{[1
]}

Tan, NCG

Picioreanu, C

Jetten, MSM

Schmidt, I

van Loosdrecht, MCM

机构：

[1] Delft Univ Technol, Dept Biotechnol, NL-2600 AA Delft, Netherlands

[2] Radboud Univ Nijmegen, Dept Microbiol, IWWR, Nijmegen, Netherlands

[3] Univ Bayreuth, Dept Microbiol, Bayreuth, Germany

来源：

BIOCHEMICAL SOCIETY TRANSACTIONS | 2006年 / 34卷

关键词：

ammonia oxidation; nitric oxide (NO); nitrification; nitrifier denitrification; nitrogen dioxide (NO2); NOx cycle;

D O I：

10.1042/BST0340179

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Ammonia-oxidizing bacteria (AOB) can use oxygen and nitrite as electron acceptors. Nitrite reduction by Nitrosomonas is observed under three conditions: (i) hydrogen-dependent denitrification, (ii) anoxic ammonia oxidation with nitrogen dioxide (NO2) and (iii) NOx-induced aerobic ammonia oxidation. NOx molecules play an important role in the conversion of ammonia and nitrite by AOB. Absence of nitric oxide (NO), which is generally detectable during ammonia oxidation, severely impairs ammonia oxidation by AOB. The lag phase of recovery of aerobic ammonia oxidation was significantly reduced by NO2 addition. Acetylene inhibition tests showed that NO2-dependent and oxygen-dependent ammonia oxidation can be distinguished. Addition of NOx increased specific activity of ammonia oxidation, growth fate and denitrification capacity. Together, these findings resulted in a hypothetical model on the role of NOx in ammonia oxidation: the NOx cycle.

引用

页码：179 / 181

页数：3

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