Identification and characterization of mitochondrial Mia40 as an iron-sulfur protein.
Identification and characterization of mitochondrial Mia40 as an iron-sulfur protein.
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线粒体 Mia40 作为铁硫蛋白的鉴定和表征。
DOI:
10.1042/bj20130442
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Spiller MP
中科院分区:
文献类型:
--
作者:
Spiller MP
Mia40 is a highly conserved mitochondrial protein that plays an essential role in the import and oxidative folding of many proteins of the mitochondrial intermembrane space. Mia40 uses its redox active CPC motif to shuttle disulfides between its client proteins (newly imported proteins) and the thiol oxidase Erv1. As a thiol oxidoreductase, no cofactor was found in Mia40, nor is a cofactor required for this function. In the present study we, for the first time based on bothin vitroandin vivostudies, show that yeast Mia40 can exist as an Fe–S (iron–sulfur) protein as well. We show that Mia40 binds a [2Fe–2S] cluster in a dimer form with the cluster co-ordinated by the cysteine residues of the CPC motifs. The biological relevance of the cofactor binding was confirmedin vivoby cysteine redox state and iron uptake analyses, which showed that a significant amount of cellular Mia40 binds ironin vivo. Furthermore, our oxygen consumption results suggested that the Fe–S-containing Mia40 is not an electron donor for Erv1. Thus we conclude that Mia40 is a novel Fe–S protein with a new cluster-binding motif (CPC), and apart from the thiol oxidoreductase activity, Mia40 may have another important, as yet undefined, function in cells.
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DOI:
10.1016/j.bbamcr.2007.12.005
发表时间:
2008-04-01
影响因子:
5.1
作者:
Hell, Kai
通讯作者:
Hell, Kai
影响因子:
2.9
作者:
Farrell, SR;Thorpe, C
通讯作者:
Thorpe, C
影响因子:
4.8
作者:
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通讯作者:
K. Hell
影响因子:
4.8
作者:
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通讯作者:
Endo, T
影响因子:
6.8
作者:
FREEDMAN, RB
通讯作者:
FREEDMAN, RB