Heme uptake in bacterial pathogens.

Heme uptake in bacterial pathogens.
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细菌病原体对血红素的摄取。

DOI:
10.1016/j.cbpa.2013.12.014
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发表时间:
2014-04
影响因子:
7.8
通讯作者:
Goulding, Celia W.
Goulding, Celia W.
中科院分区:
生物学2区
文献类型:
--
作者:
Contreras, Heidi;Chim, Nicholas;Credali, Alfredo;Goulding, Celia W.

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铁是生物体生存所必需的营养物质。细菌病原体拥有从其人类宿主那里获得血红素的特殊途径。在这篇综述中,我们介绍了最新的结构和生化数据,这些数据提供了对几种细菌血红素吸收途径的机械性见解,包括从人的血红素蛋白中将血红素隔离到分泌或膜结合的细菌蛋白中,通过细菌膜运输血红素,以及在细菌胞质中降解血红素以释放铁。血红素进入细菌胞浆的途径是不同的,含有不同的蛋白质序列、新的结构、不同数量的蛋白质和不同的机制。一致的是,细菌胞质中的血红素被序列分歧的蛋白质分解,释放出铁和不同的降解产物。
Iron is an essential nutrient for the survival of organisms. Bacterial pathogens possess specialized pathways to acquire heme from their human hosts. In this review, we present recent structural and biochemical data that provide mechanistic insights into several bacterial heme uptake pathways, encompassing the sequestration of heme from human hemoproteins to secreted or membrane-associated bacterial proteins, the transport of heme across bacterial membranes, and the degradation of heme within the bacterial cytosol to liberate iron. The pathways for heme transport into the bacterial cytosol are divergent, harboring non-homologous protein sequences, novel structures, varying numbers of proteins, and different mechanisms. Congruously, the breakdown of heme within the bacterial cytosol by sequence-divergent proteins releases iron and distinct degradation products.
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发表时间: 2012-03
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