CheA-receptor interaction sites in bacterial chemotaxis.

CheA-receptor interaction sites in bacterial chemotaxis.
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DOI:
10.1016/j.jmb.2012.05.023
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发表时间:
2012-09-14
影响因子:
5.6
通讯作者:
Dahlquist, Frederick W.
Dahlquist, Frederick W.
中科院分区:
生物学2区
文献类型:
--
作者:
Wang, Xiqing;Vu, Anh;Lee, Kwangwoon;Dahlquist, Frederick W.

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在细菌趋化性中,跨膜化学感受器、CheA组氨酸激酶和CheW偶联蛋白组装成信号复合物,使细菌能够根据环境刺激调节其游动行为。在三元复合物中的蛋白质 - 蛋白质相互作用中,CheA - CheW和CheW - 受体相互作用先前已被研究,而CheA - 受体相互作用则较少被探究。在此,我们通过核磁共振波谱法对海栖热袍菌中的CheA - 受体相互作用进行了表征,并验证了在大肠杆菌趋化性中所确定的CheA受体结合位点。我们发现CheA与化学感受器相互作用的方式类似于CheW,并且CheA调节结构域的受体结合位点与CheW的同源。总体而言,CheA - CheW复合物中的受体结合位点表明,CheA的构象变化对于CheA - CheW - 受体三元复合物的组装以及CheA的激活是必需的。
In bacterial chemotaxis, transmembrane chemoreceptors, the CheA histidine kinase, and the CheW coupling protein assemble into signaling complexes that allow bacteria to modulate their swimming behavior in response to environmental stimuli. Among the protein-protein interactions in the ternary complex, CheA-CheW and CheW-receptor interactions were studied previously, whereas CheA-receptor interaction has been less investigated. Here, we characterize the CheA-receptor interaction in Thermotoga maritima by NMR spectroscopy and validate the identified receptor binding site of CheA in Escherichia coli chemotaxis. We find that CheA interacts with chemoreceptor in a manner similar to CheW, and the receptor binding site of CheA's regulatory domain is homologous to that of CheW. Collectively, the receptor binding sites in CheA-CheW complex suggest that conformational changes in CheA are required for assembly of the CheA-CheW-receptor ternary complex and CheA activation.
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