Influence of specific HSP70 domains on fibril formation of the yeast prion protein Ure2.

Influence of specific HSP70 domains on fibril formation of the yeast prion protein Ure2.
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特定 HSP70 结构域对酵母朊病毒蛋白 Ure2 纤维形成的影响

DOI:
10.1098/rstb.2011.0410
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发表时间:
2013-05-05
期刊:
Philosophical transactions of the Royal Society of London. Series B, Biological sciences
影响因子:
--
通讯作者:
Perrett S
Perrett S
中科院分区:
其他
文献类型:
--
作者:
Xu LQ;Wu S;Buell AK;Cohen SI;Chen LJ;Hu WH;Cusack SA;Itzhaki LS;Zhang H;Knowles TP;Dobson CM;Welland ME;Jones GW;Perrett S

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Ure 2 p是酿酒酵母朊病毒状态的蛋白质决定簇[URE 3]。HSP 70家族成员SSA 1的组成性过表达治愈[URE 3]细胞。在这里,我们表明,Ssa 1 p增加的滞后时间在体外的核苷酸的存在或不存在下的Ure 2 p原纤维形成。HSP 40共伴侣Ydj 1 p的存在对抑制Ure 2 p原纤维形成具有累加效应,而Ydj 1 p H34 Q突变体单独和与Ssa 1 p组合显示抑制降低。为了研究这些效应的结构基础,我们构建并测试了一个缺乏ATP酶结构域的Ssa 1 p突变体,以及一系列C-末端截短突变体。结果表明,Ssa 1 p可以结合到Ure 2 p和延迟纤维形成,即使在ATP酶结构域的情况下,但Ure 2 p与底物结合结构域的相互作用受到C-末端盖区域的强烈影响。动态光散射、石英晶体微天平测定、下拉测定和动力学分析表明,Ssa 1 p与天然Ure 2 p和原纤维种子相互作用,并以浓度依赖性方式降低Ure 2 p原纤维伸长速率。这些结果为Ssa 1 p和Ydj 1 p抑制Ure 2 p原纤维形成的结构和机制基础提供了新的见解。
Ure2p is the protein determinant of the Saccharomyces cerevisiae prion state [URE3]. Constitutive overexpression of the HSP70 family member SSA1 cures cells of [URE3]. Here, we show that Ssa1p increases the lag time of Ure2p fibril formation in vitro in the presence or absence of nucleotide. The presence of the HSP40 co-chaperone Ydj1p has an additive effect on the inhibition of Ure2p fibril formation, whereas the Ydj1p H34Q mutant shows reduced inhibition alone and in combination with Ssa1p. In order to investigate the structural basis of these effects, we constructed and tested an Ssa1p mutant lacking the ATPase domain, as well as a series of C-terminal truncation mutants. The results indicate that Ssa1p can bind to Ure2p and delay fibril formation even in the absence of the ATPase domain, but interaction of Ure2p with the substrate-binding domain is strongly influenced by the C-terminal lid region. Dynamic light scattering, quartz crystal microbalance assays, pull-down assays and kinetic analysis indicate that Ssa1p interacts with both native Ure2p and fibril seeds, and reduces the rate of Ure2p fibril elongation in a concentration-dependent manner. These results provide new insights into the structural and mechanistic basis for inhibition of Ure2p fibril formation by Ssa1p and Ydj1p.
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