Cytochrome c biogenesis System I.

Cytochrome c biogenesis System I.
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DOI:
10.1111/j.1742-4658.2011.08376.x
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发表时间:
2011-11
期刊:
The FEBS journal
影响因子:
--
通讯作者:
Ferguson SJ
Ferguson SJ
中科院分区:
其他
文献类型:
--
作者:
Stevens JM;Mavridou DA;Hamer R;Kritsiligkou P;Goddard AD;Ferguson SJ

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细胞色素c是广泛分布的呼吸蛋白,其特征在于血红素的共价连接。C型细胞色素的形成需要在除了少数例外情况之外的所有情况下在蛋白质中的-CXXCH-基序中的两个半胱氨酸硫和血红素的乙烯基之间形成两个硫醚键。血红素的乙烯基不是特别活化的,因此加成反应在生理上不会在细胞中自发发生。有几种不同的翻译后修饰系统用于形成这些键。在这里,我们描述了复杂的多蛋白质细胞色素c成熟(Ccm)系统(在大肠杆菌中包含的蛋白质CcmABCDEFGH),也称为系统I,执行血红素附件。系统I存在于植物线粒体、古生菌和许多革兰氏阴性细菌中;在其他生物和细胞器中发现的系统在本小综述系列的其他地方进行了描述。
Cytochromes c are widespread respiratory proteins characterized by the covalent attachment of heme. The formation of c-type cytochromes requires, in all but a few exceptional cases, the formation of two thioether bonds between the two cysteine sulfurs in a –CXXCH– motif in the protein and the vinyl groups of heme. The vinyl groups of the heme are not particularly activated and therefore the addition reaction does not physiologically occur spontaneously in cells. There are several diverse post-translational modification systems for forming these bonds. Here, we describe the complex multiprotein cytochrome c maturation (Ccm) system (in Escherichia coli comprising the proteins CcmABCDEFGH), also called System I, that performs the heme attachment. System I is found in plant mitochondria, archaea and many Gram-negative bacteria; the systems found in other organisms and organelles are described elsewhere in this minireview series.
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