SGTA interacts with the proteasomal ubiquitin receptor Rpn13 via a carboxylate clamp mechanism.

SGTA interacts with the proteasomal ubiquitin receptor Rpn13 via a carboxylate clamp mechanism.
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DOI:
10.1038/srep36622
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发表时间:
2016-11-09
期刊:
影响因子:
4.6
通讯作者:
Isaacson RL
Isaacson RL
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Thapaliya A;Nyathi Y;Martínez-Lumbreras S;Krysztofinska EM;Evans NJ;Terry IL;High S;Isaacson RL

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错误定位到胞质溶胶的分泌蛋白和膜蛋白的命运是由辅助伴侣 SGTA(小型、富含谷氨酰胺的四三肽重复蛋白 α)和 BAG6 复合体之间的协作决定的,BAG6 复合体的操作依赖于与不同结合伙伴的多种短暂且微妙的相互作用。这些包括伴侣、膜靶向蛋白和泛素化酶。最近发现 SGTA 和蛋白酶体之间存在直接相互作用,由内在蛋白酶体泛素受体 Rpn13 介导。在这里,我们从结构和生物物理上表征了这种结合,并确定了 Rpn13 C 末端结构域的一个区域,该区域对于促进这种结合是必要且充分的。我们证明这种接触是通过羧酸钳介导的分子识别事件与 SGTA 的 TPR 结构域发生的,并提供证据表明这种相互作用可以在细胞环境中介导 Rpn13 和 SGTA 的关联。
The fate of secretory and membrane proteins that mislocalize to the cytosol is decided by a collaboration between cochaperone SGTA (small, glutamine-rich, tetratricopeptide repeat protein alpha) and the BAG6 complex, whose operation relies on multiple transient and subtly discriminated interactions with diverse binding partners. These include chaperones, membrane-targeting proteins and ubiquitination enzymes. Recently a direct interaction was discovered between SGTA and the proteasome, mediated by the intrinsic proteasomal ubiquitin receptor Rpn13. Here, we structurally and biophysically characterize this binding and identify a region of the Rpn13 C-terminal domain that is necessary and sufficient to facilitate it. We show that the contact occurs through a carboxylate clamp-mediated molecular recognition event with the TPR domain of SGTA, and provide evidence that the interaction can mediate the association of Rpn13 and SGTA in a cellular context.
DOI: 10.1371/journal.pone.0113281
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