Insights into MHC class I peptide loading from the structure of the tapasin-ERp57 thiol oxidoreductase heterodimer.

Insights into MHC class I peptide loading from the structure of the tapasin-ERp57 thiol oxidoreductase heterodimer.
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DOI:
10.1016/j.immuni.2008.10.018
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发表时间:
2009-01-16
期刊:
影响因子:
32.4
通讯作者:
Reinisch, Karin M.
Reinisch, Karin M.
中科院分区:
医学1区
文献类型:
--
作者:
Dong, Gang;Wearsch, Pamela A.;Peaper, David R.;Cresswell, Peter;Reinisch, Karin M.

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Tapasin是一种糖蛋白,对装载具有高亲和力的主要组织相容性复合体(MHC)I类分子至关重要。它在多聚肽负载复合体(PLC)中作为二硫键连接的稳定的异二聚体与硫醇氧化还原酶ERp57结合,这种共价相互作用是支持PLC最佳活性所必需的。在这里,我们介绍了PLC的Tapasin/ERp57内核的2.6?分辨率结构。该结构揭示了Tapasin和ERp57稳定二聚的基础,并提供了第一个蛋白质二硫键异构酶家族成员与底物相互作用的例子。突变分析确定了Tapasin上一个保守的表面,它与MHC I类分子相互作用,对于Tapasin-ERp57异源二聚体的肽装载和编辑功能至关重要。通过将Tapasin/ERp57结构与其他已定义的PLC组分相结合,我们提出了一个分子模型,该模型解释了MHC I类多肽负载的过程。
Tapasin is a glycoprotein critical for loading Major Histocompatibility Complex (MHC) class I molecules with high affinity peptides. It functions within the multimeric peptide-loading complex (PLC) as a disulfide-linked, stable heterodimer with the thiol oxidoreductase ERp57, and this covalent interaction is required to support optimal PLC activity. Here we present the 2.6 Å resolution structure of the tapasin/ERp57 core of the PLC. The structure reveals the basis for the stable dimerization of tapasin and ERp57 and provides the first example of a protein disulfide isomerase family member interacting with a substrate. Mutational analysis identified a conserved surface on tapasin that interacts with MHC class I molecules and is critical for the peptide loading and editing function of the tapasin-ERp57 heterodimer. By combining the tapasin/ERp57 structure with those of other defined PLC components we present a molecular model that illuminates the processes involved in MHC class I peptide loading.
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