期刊
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 368, 期 1622, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rstb.2012.0259
关键词
metal cofactor; iron-sulfur; electron paramagnetic resonance; organelle; molybdenum cofactor enzyme
类别
资金
- Marie Curie Intra-European Fellowship
- Royal Society Fellowship
- Biotechnology and Biological Sciences Research Council [BBS/E/J/000C0657, BB/K008838/1] Funding Source: researchfish
- BBSRC [BBS/E/J/000C0657, BB/K008838/1] Funding Source: UKRI
The assembly of iron-sulfur (Fe-S) clusters requires dedicated protein factors inside the living cell. Striking similarities between prokaryotic and eukaryotic assembly proteins suggest that plant cells inherited two different pathways through endosymbiosis: the ISC pathway in mitochondria and the SUF pathway in plastids. Fe-S proteins are also found in the cytosol and nucleus, but little is known about how they are assembled in plant cells. Here, we show that neither plastid assembly proteins nor the cytosolic cysteine desulfurase ABA3 are required for the activity of cytosolic aconitase, which depends on a [4Fe-4S] cluster. In contrast, cytosolic aconitase activity depended on the mitochondrial cysteine desulfurase NFS1 and the mitochondrial transporter ATM3. In addition, we were able to complement a yeast mutant in the cytosolic Fe-S cluster assembly pathway, dre2, with the Arabidopsis homologue AtDRE2, but only when expressed together with the diflavin reductase AtTAH18. Spectroscopic characterization showed that purified AtDRE2 could bind up to two Fe-S clusters. Purified AtTAH18 bound one flavin per molecule and was able to accept electrons from NAD(P) H. These results suggest that the proteins involved in cytosolic Fe-S cluster assembly are highly conserved, and that dependence on the mitochondria arose before the second endosymbiosis event leading to plastids.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据