Formation of High-Conductive C Subunit Channels upon Interaction with Cyclophilin D.

Formation of High-Conductive C Subunit Channels upon Interaction with Cyclophilin D.
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DOI:
10.3390/ijms222011022
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发表时间:
2021-10-13
影响因子:
5.6
通讯作者:
Pavlov EV
Pavlov EV
中科院分区:
生物学2区
文献类型:
--
作者:
Amodeo GF;Krilyuk N;Pavlov EV

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ATP合成酶的c亚基是一种线粒体内膜(IMM)蛋白。除了作为ATP合成酶转子的主要成分外,哺乳动物线粒体c亚基还具有离子通道活性。特别是,c亚基可能参与导致在线粒体渗透性转换(PT)过程中形成渗透性转换孔(PTP)的途径之一,这是一种由高水平钙引起的IMM透化现象。我们之前对合成c亚基的研究表明,高浓度的钙会诱导错误折叠成交叉β寡聚体,这些寡聚体在约400 pS的模型脂质双层中形成低电导通道。在这里,我们研究了亲环素D(CypD),线粒体伴侣和PTP的主要调节剂,对c亚基的电生理活性的影响,以评估其在c亚基的功能特性中的作用。我们的研究表明,在CypD的存在下,c亚基表现出更大的电导,高达4 nS,这可能与其在线粒体毒性中的潜在作用有关。此外,我们的研究结果表明,CypD是必要的c亚基诱导PTP的形成,但可能不是一个组成部分的孔。
The c subunit of the ATP synthase is an inner mitochondrial membrane (IMM) protein. Besides its role as the main component of the rotor of the ATP synthase, c subunit from mammalian mitochondria exhibits ion channel activity. In particular, c subunit may be involved in one of the pathways leading to the formation of the permeability transition pore (PTP) during mitochondrial permeability transition (PT), a phenomenon consisting of the permeabilization of the IMM due to high levels of calcium. Our previous study on the synthetic c subunit showed that high concentrations of calcium induce misfolding into cross-β oligomers that form low-conductance channels in model lipid bilayers of about 400 pS. Here, we studied the effect of cyclophilin D (CypD), a mitochondrial chaperone and major regulator of PTP, on the electrophysiological activity of the c subunit to evaluate its role in the functional properties of c subunit. Our study shows that in presence of CypD, c subunit exhibits a larger conductance, up to 4 nS, that could be related to its potential role in mitochondrial toxicity. Further, our results suggest that CypD is necessary for the formation of c subunit induced PTP but may not be an integral part of the pore.
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