Multitasking in the mitochondrion by the ATP-dependent Lon protease.

Multitasking in the mitochondrion by the ATP-dependent Lon protease.
复制标题

通过ATP依赖性LON蛋白酶在线粒体中的多任务。

DOI:
10.1016/j.bbamcr.2011.11.003
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发表时间:
2012-01
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Suzuki CK
Suzuki CK
中科院分区:
其他
文献类型:
--
作者:
Venkatesh S;Lee J;Singh K;Lee I;Suzuki CK

文献摘要

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AAA+ Lon蛋白酶是一种可溶性单环同源低聚物,它代表了介导atp依赖性蛋白水解的最精简的操作单元。尽管其结构简单,但Lon蛋白酶的结构表现出物种特异性的多样性。同源性建模提供了对结构特征的见解,这些结构特征区分了细菌和人类的Lon蛋白酶作为六聚体复合物与酵母的Lon,后者是独特的七聚体。线粒体Lon最广为人知的功能是在正常代谢条件下维持蛋白质稳态,并在环境和细胞应激下防止蛋白质毒性。人类Lon的一个有趣的特性是它与g -四重体DNA的特异性结合,以及它与培养细胞中线粒体基因组的关联。Lon的一部分优先结合到线粒体DNA的控制区,在那里开始转录和复制。在这里,我们介绍了线粒体Lon的各种功能的概述,以及其在蛋白质和mtDNA质量控制中的作用的推测观点。
The AAA+ Lon protease is a soluble single-ringed homo-oligomer, which represents the most streamlined operational unit mediating ATP-dependent proteolysis. Despite its simplicity, the architecture of Lon proteases exhibits a species-specific diversity. Homology modeling provides insights into the structural features that distinguish bacterial and human Lon proteases as hexameric complexes from yeast Lon, which is uniquely heptameric. The best-understood functions of mitochondrial Lon are linked to maintaining proteostasis under normal metabolic conditions, and preventing proteotoxicity during environmental and cellular stress. An intriguing property of human Lon is its specific binding to G-quadruplex DNA, and its association with the mitochondrial genome in cultured cells. A fraction of Lon preferentially binds to the control region of mitochondrial DNA where transcription and replication are initiated. Here, we present an overview of the diverse functions of mitochondrial Lon, as well as speculative perspectives on its role in protein and mtDNA quality control.
DOI: 10.1128/jb.158.1.195-201.1984
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