The FAD-PAS domain as a sensor for behavioral responses in Escherichia coli.

The FAD-PAS domain as a sensor for behavioral responses in Escherichia coli.
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FAD-PAS 结构域作为大肠杆菌行为反应的传感器。

DOI:
10.1089/15230860152665037
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发表时间:
2001
期刊:
Antioxidants & redox signaling.
影响因子:
--
通讯作者:
Johnson,MS
Johnson,MS
中科院分区:
--
文献类型:
--
作者:
Taylor,BL;Rebbapragada,A;Johnson,MS

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Aer是大肠杆菌中的趋氧性受体,是一类新型黄蛋白的成员,可充当氧化还原传感器。电池的内能与电子的氧化还原态耦合 传输系统,并且该状态由Aer(FAD)感测。这是一个比ifE更通用的感觉反应系统。高浓度的氧气减少电子的能量消耗条件 电子传递还改变电子传递系统的氧化还原状态。Aer通过向鞭毛马达发送信号来改变方向。利用氧化还原的其他感觉系统的输出 传感器更常见的是转录调节而不是行为反应。计算机分析表明,Aer是PAS结构域蛋白超家族的一部分,该超家族感知细胞内环境。 在Aer中,FAD结合PAS结构域。通过使用位点特异性诱变,在PAS结构域中鉴定了FAD结合和感觉转导的关键残基。PAS结构域似乎与 在C-末端具有接头区。接头区是HAMP结构域家族的成员,其在其他系统中具有信号转导作用。
Aer, the aerotaxis receptor inEscherichia coli, is a member of a novel class of flavoproteins that act as redox sensors. The internal energy of the cell is coupled to the redox state of the electron transport system, and this status is sensed by Aer(FAD). This is a more versatile sensory response system than ifE. colisensed oxygenper se. Energy-depleting conditions that decrease electron transport also alter the redox state of the electron transport system. Aer responds by sending a signal to the flagellar motor to change direction. The output of other sensory systems that utilize redox sensors is more commonly transcriptional regulation than a behavioral response. Analysisin silicoshowed Aer to be part of a superfamily of PAS domain proteins that sense the intracellular environment. In Aer, FAD binds to the PAS domain. By using site-specific mutagenesis, residues critical for FAD binding and sensory transduction were identified in the PAS domain. The PAS domain appears to interact with a linker region in the C-terminus. The linker region is a member of a HAMP domain family, which has signal transduction roles in other systems.
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