Truncated hemoglobin o of Mycobacterium tuberculosis: the oligomeric state change and the interaction with membrane components.

Truncated hemoglobin o of Mycobacterium tuberculosis: the oligomeric state change and the interaction with membrane components.
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结核分枝杆菌的截短血红蛋白 o:寡聚状态变化及其与膜成分的相互作用。

DOI:
10.1016/j.bbrc.2004.02.170
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发表时间:
2004
影响因子:
3.1
通讯作者:
Chang,Zengyi
Chang,Zengyi
中科院分区:
生物学4区
文献类型:
--
作者:
Liu,Chong;He,Yuan;Chang,Zengyi

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作为一种专性需氧菌,结核分枝杆菌细胞必须进化出一种机制来收集和输送难以获得的O2,以在肉芽肿中存活并在潜伏期维持低水平的呼吸。分枝结核病截短血红蛋白o(trHbO)在大肠杆菌细胞中异源表达时,发现其显著增强细胞呼吸和细胞生长。本研究试图了解trHbO促进细胞呼吸的分子细节,重点关注trHbO被募集到细胞膜和O2分子被递送的方式。我们的数据表明,trHbO蛋白能够促进E.大肠杆菌细胞中的一种方式,取决于呼吸链末端氧化酶细胞色素o复合物(或Cyo复合物)的存在。trHbO蛋白似乎与Cyo复合物的Cyo B亚基直接相互作用,可能以动态方式。trHbO还能够以非特异性方式结合膜脂质,在此过程中可能存在静电和疏水相互作用。此外,与膜结合诱导trHbO从二聚体解离成单体。根据这些观察结果,提出了一个假设来解释trHbO如何作为M的O2收集器和/或储存器。结核病细胞在氧限制或缺乏条件下。
Being an obligate aerobe, the Mycobacterium tuberculosis cells would have to evolve a mechanism to collect and deliver the hardly available O2to survive in granulomas and to maintain the low level of respiration during latency. The M. tuberculosis truncated hemoglobin o (trHbO), when heterologously expressed in Escherichia coli cells, was found to significantly enhance the cellular respiration and cell growth. This study was undertaken in an attempt to understand the molecular details for trHbO to promote the cellular respiration, focusing on the ways through which trHbO is recruited to the cell membrane and O2molecules are delivered. Our data demonstrate that the trHbO protein is able to promote the growth of E. coli cells in a fashion that depends on the presence of the respiratory chain terminal oxidase cytochrome o complex (or Cyo complex). The trHbO protein appears to interact with the Cyo B subunit of the Cyo complex directly, likely in a dynamic manner. The trHbO is also able to bind membrane lipids in a non-specific way, during the process electrostatic and hydrophobic interactions both likely exist. Besides, binding with membrane induces the dissociation of trHbO from dimers to monomers. In light of these observations, a hypothesis was made to explain how trHbO might serve as an O2collector and/or reservoir for M. tuberculosis cells under O2-limiting or lacking conditions.
通过删除和交联分析探讨大肠杆菌 bo 型泛醇氧化酶亚基 IV 的作用*
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