Structure and Interactions of the TPR Domain of Sgt2 with Yeast Chaperones and Ybr137wp.

Structure and Interactions of the TPR Domain of Sgt2 with Yeast Chaperones and Ybr137wp.
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DOI:
10.3389/fmolb.2017.00068
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发表时间:
2017
影响因子:
5
通讯作者:
Isaacson RL
Isaacson RL
中科院分区:
生物学3区
文献类型:
--
作者:
Krysztofinska EM;Evans NJ;Thapaliya A;Murray JW;Morgan RML;Martinez-Lumbreras S;Isaacson RL

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富含谷氨酰胺的小分子三肽重复序列蛋白2(Sgt 2)是一种多模块共伴侣蛋白,参与多种蛋白质质量控制途径。Sgt 2和其他几种蛋白质(包括SGTA、Hop和CHIP)的TPR结构域是高度保守的基序,已知其与分子伴侣(如Hsp 70和Hsp 90)形成瞬时复合物。在这项工作中,我们提出了第一个高分辨率的晶体结构的Sgt2_TPR单独和复杂的C-末端肽PTVEEVD从热休克蛋白,Ssa 1。使用核磁共振光谱和等温滴定量热法,我们表明,Sgt2_TPR相互作用的肽对应的C-末端的Ssa 1,Hsc 82,和Ybr 137 wp具有类似的结合模式和亲和力。
Small glutamine-rich tetratricopeptide repeat-containing protein 2 (Sgt2) is a multi-module co-chaperone involved in several protein quality control pathways. The TPR domain of Sgt2 and several other proteins, including SGTA, Hop, and CHIP, is a highly conserved motif known to form transient complexes with molecular chaperones such as Hsp70 and Hsp90. In this work, we present the first high resolution crystal structures of Sgt2_TPR alone and in complex with a C-terminal peptide PTVEEVD from heat shock protein, Ssa1. Using nuclear magnetic resonance spectroscopy and isothermal titration calorimetry, we demonstrate that Sgt2_TPR interacts with peptides corresponding to the C-termini of Ssa1, Hsc82, and Ybr137wp with similar binding modes and affinities.
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影响因子: 2.7
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