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:
影响因子:
--
通讯作者:
Perrett S
中科院分区:
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
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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影响因子:
5.7
作者:
Bousset, L;Belrhali, H;Morera, S
通讯作者:
Morera, S
DOI:
10.1063/1.3608916
发表时间:
2011-08-14
期刊:
The Journal of chemical physics
影响因子:
--
作者:
Cohen SI;Vendruscolo M;Welland ME;Dobson CM;Terentjev EM;Knowles TP
通讯作者:
Knowles TP
影响因子:
25
作者:
Aguzzi, Adriano;Falsig, Jeppe
通讯作者:
Falsig, Jeppe
DOI:
10.1073/pnas.0903503106
发表时间:
2009-05-26
影响因子:
11.1
作者:
Bertelsen, Eric B.;Chang, Lyra;Zuiderweg, Erik R. P.
通讯作者:
Zuiderweg, Erik R. P.
影响因子:
4.8
作者:
Hainzl, O;Wegele, H;Buchner, J
通讯作者:
Buchner, J