Cytochrome c biogenesis: the Ccm system.

Cytochrome c biogenesis: the Ccm system.
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DOI:
10.1016/j.tim.2010.03.006
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发表时间:
2010-06
影响因子:
15.9
通讯作者:
Daldal F
Daldal F
中科院分区:
生物学1区
文献类型:
--
作者:
Sanders C;Turkarslan S;Lee DW;Daldal F

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C型细胞色素含有共价连接的血红素,其通过血红素B的乙烯基和脱辅基细胞色素的C1 XXC 2 H基序的半胱氨酸之间的硫醚键形成。在各种生物体中,这种翻译后修饰依赖于膜相关的特异性生物合成蛋白,称为细胞色素c成熟系统。这些系统的一个高度复杂的版本,Ccm或系统I,在革兰氏阴性细菌,古细菌和植物线粒体中发现。在这里,我们描述了新出现的Ccm组件分为三个保守的模块之间的功能相互作用,并提出了一个普遍存在的乙烯基-2 ~Cys1和乙烯基-4 ~Cys2血红素b-脱辅基细胞色素c硫醚键在c型细胞色素的分子基础的机械视图。
Cytochromes of c-type contain covalently attached hemes that are formed via thioether bonds between the vinyls of heme b and cysteines of the C1XXC2H motifs of apocytochromes. In various organisms, this post-translational modification relies on membrane-associated specific biogenesis proteins, referred to as cytochrome c maturation systems. A highly complex version of these systems, Ccm or System I, is found in Gram-negative bacteria, archaea and plant mitochondria. Here, we describe emerging functional interactions between the Ccm components categorized into three conserved modules, and present a mechanistic view of the molecular basis of ubiquitous vinyl-2~Cys1 and vinyl-4~Cys2 heme b-apocytochrome c thioether bonds in c-type cytochromes.
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