Functional characterization of the Shigella dysenteriae heme ABC transporter.

Functional characterization of the Shigella dysenteriae heme ABC transporter.
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DOI:
10.1021/bi801005u
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发表时间:
2008-08-05
期刊:
影响因子:
2.9
通讯作者:
Wilks, Angela
Wilks, Angela
中科院分区:
生物学3区
文献类型:
--
作者:
Burkhard, Kimberly A.;Wilks, Angela

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志贺氏痢疾杆菌的血红素ATP结合盒(ABC)转运体shuv已被纳入蛋白脂体。ShuUV的功能表征表明,ATP水解和血红素从外质结合蛋白(ShuT)转运到细胞质结合蛋白(ShuS)是偶联的。关闭残基的定点突变被认为是稳定复合体废除血红素运输所必需的。此外,位于ShuU易位通道的His-252和His-262残基是血红素从ShuU释放和转运到ShuS所必需的。体外血红素摄取系统的初步功能表征为未来的光谱研究提供了一个平台。
The heme ATP binding cassette (ABC) transporter, ShuUV, of Shigella dysenteriae has been incorporated into proteoliposomes. Functional characterization of ShuUV revealed that ATP hydrolysis and transport of heme from the periplasmic binding protein, ShuT, to the cytoplasmic binding protein, ShuS, are coupled. Site-directed mutagenesis of ShuT residues proposed to be required for stabilization of the complex abolished heme transport. Furthermore, residues His-252 and His-262, located in the translocation channel of ShuU, were required for the release of heme from ShuT and translocation to ShuS. The initial functional characterization of an in vitro heme uptake system provides a platform for future spectroscopic studies.
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