Dual Sensors and Dual Response Regulators Interact to Control Nitrate- and Nitrite-Responsive Gene Expression in Escherichia coli

Dual Sensors and Dual Response Regulators Interact to Control Nitrate- and Nitrite-Responsive Gene Expression in Escherichia coli
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双传感器和双响应调节器相互作用来控制大肠杆菌中的硝酸盐和亚硝酸盐响应基因表达

DOI:
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发表时间:
1995
期刊:
影响因子:
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通讯作者:
R. S. Rabin
R. S. Rabin
中科院分区:
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文献类型:
--
作者:
V. Stewart;R. S. Rabin

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硝酸盐和亚硝酸盐的控制是由 Nar(硝酸盐还原酶)双重相互作用的双组分调节系统介导的,该系统由同源膜结合传感器(NarX 和 NarQ 蛋白)和同源 DNA 结合反应调节器(NarL 和 NarP 蛋白)组成。本章强调Nar系统严格控制硝酸盐和亚硝酸盐代谢以满足无氧呼吸的需要,与使用硝酸盐或亚硝酸盐作为生物合成的氮源无关。双硝酸盐响应传感器的识别导致人们认为双响应调节器也可能参与 Nar 调节电路。对 narL 和 narP 无效突变体中靶操纵子表达的分析揭示了调控模式的多样性。 narQ 和 narP 基因最近才被认识,而 narX 和 narL 基因已被研究多年。序列比较强烈表明 NarX/NarQ 和 NarL/NarP 蛋白在磷酰基转移反应中发挥作用。对纯化蛋白质的研究已经检验了一些体外相互作用。 NarL 蛋白中的 Asp-59 残基对应于所有研究的反应调节剂中的磷酸化位点。特定的平衡状态会根据正负传感器活动的净效应产生调节结果,进而控制 NarL 响应调节器的磷酸化状态。现在已经详细研究了几种硝酸盐和亚硝酸盐调节操纵子的控制区域。大多数研究都使用含有过量硝酸盐或亚硝酸盐的分批培养物。
Nitrate and nitrite control is mediated by the Nar (nitrate reductase) dual interacting two-component regulatory systems, which consist of homologous membrane-bound sensors (the NarX and NarQ proteins) and homologous DNA binding response regulators (the NarL and NarP proteins). This chapter emphasizes that the Nar system controls nitrate and nitrite metabolism strictly in response to the needs of anaerobic respiration and has nothing to do with the use of nitrate or nitrite as nitrogen sources for biosynthesis. Identification of dual nitrate-responsive sensors led to the notion that dual response regulators may also be involved in the Nar regulatory circuit. Analysis of target operon expression in narL and narP null mutants has revealed a diversity of regulatory patterns. The narQ and narP genes have only recently been recognized, whereas the narX and narL genes have been studied for many years. Sequence comparisons strongly suggest that the NarX/NarQ and NarL/NarP proteins function in phosphoryl transfer reactions. Studies with purified proteins have examined some of the interactions in vitro. The Asp-59 residue in the NarL protein corresponds to the site of phosphorylation in all response regulators studied. A specific equilibrium state produces a regulatory outcome based on the net effect of the positive and negative sensor activities, which, in turn, controls the phosphorylation state of the NarL response regulator. The control regions of several nitrate- and nitrite-regulated operons have now been studied in detail. Most studies have used batch cultures grown with excess nitrate or nitrite.
narL 基因产物激活大肠杆菌中的硝酸还原酶操纵子并抑制富马酸还原酶和三甲胺 N-氧化物还原酶操纵子。
DOI: 10.1073/pnas.84.11.3901
发表时间: 1987
影响因子: 11.1
作者:
Iuchi,S;Lin,EC
通讯作者: Lin,EC
大肠杆菌 K-12 中 nar(硝酸还原酶)操纵子表达的体内整合宿主因子的要求。
DOI: 10.1073/pnas.89.18.8701
发表时间: 1992
影响因子: 11.1
作者:
Rabin,RS;Collins,LA;Stewart,V
通讯作者: Stewart,V
Fnr 和 NarL 调节所需的大肠杆菌 nar 启动子中序列的位置。
DOI: --
发表时间: 1988
期刊: The Journal of biological chemistry
影响因子: --
作者:
Li,SF;DeMoss,JA
通讯作者: DeMoss,JA
NarL 介导的大肠杆菌 narGHJI 启动子转录激活所需的上游序列元件。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Dong,XR;Li,SF;DeMoss,JA
通讯作者: DeMoss,JA
NarL 和 Fnr 激活大肠杆菌硝酸还原酶 (narGHJI) 操纵子需要整合宿主因子。
DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
Schröder,I;Darie,S;Gunsalus,RP
通讯作者: Gunsalus,RP