Ero1-α and PDIs constitute a hierarchical electron transfer network of endoplasmic reticulum oxidoreductases.

Ero1-α and PDIs constitute a hierarchical electron transfer network of endoplasmic reticulum oxidoreductases.
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DOI:
10.1083/jcb.201303027
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发表时间:
2013-09-16
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Nagata K
Nagata K
中科院分区:
其他
文献类型:
--
作者:
Araki K;Iemura S;Kamiya Y;Ron D;Kato K;Natsume T;Nagata K

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Ero1-α与PDI的相互作用促进了Ero1-α的电子传递功能,激活了内质网氧化还原酶的分层电子传递网络。蛋白质二硫异构酶(PDI)家族的Ero1-α和内质网(ER)氧化还原酶促进内质网(ER)新生多肽中二硫键的有效引入。然而,在这些氧化还原酶之间的电子转移的层次结构是知之甚少。本文通过蛋白质组学分析鉴定了Ero1-α -相关的氧化还原酶,并通过表面等离子体共振进一步证实。研究发现,Ero1-α和PDI构成了一个调控中枢,其中PDI诱导的Ero1-α穿梭半胱氨酸(Cys99)的构象灵活性促进了分子内电子向活性位点的转移。在分离细胞中,Ero1-α也氧化ERp46、ERp57和P5;然而,动力学测量和氧化还原平衡分析表明,PDI优先氧化其他氧化还原酶。PDI通过它的a '结构域接受来自其他氧化还原酶的电子,绕过作为还原型谷胱甘肽电子受体的a结构域。这些观察结果为哺乳动物细胞内质网氧化还原酶之间的协同氧化还原相互作用的层次结构提供了一个完整的图景。
The interaction of Ero1-α and PDI facilitates the electron transfer function of Ero1-α, activating a hierarchical electron transfer network of endoplasmic reticulum oxidoreductases. Ero1-α and endoplasmic reticulum (ER) oxidoreductases of the protein disulfide isomerase (PDI) family promote the efficient introduction of disulfide bonds into nascent polypeptides in the ER. However, the hierarchy of electron transfer among these oxidoreductases is poorly understood. In this paper, Ero1-α–associated oxidoreductases were identified by proteomic analysis and further confirmed by surface plasmon resonance. Ero1-α and PDI were found to constitute a regulatory hub, whereby PDI induced conformational flexibility in an Ero1-α shuttle cysteine (Cys99) facilitated intramolecular electron transfer to the active site. In isolation, Ero1-α also oxidized ERp46, ERp57, and P5; however, kinetic measurements and redox equilibrium analysis revealed that PDI preferentially oxidized other oxidoreductases. PDI accepted electrons from the other oxidoreductases via its a′ domain, bypassing the a domain, which serves as the electron acceptor from reduced glutathione. These observations provide an integrated picture of the hierarchy of cooperative redox interactions among ER oxidoreductases in mammalian cells.
ERO1Alpha调节二硫化物的低还原电位可确保严格控制底物氧化。
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