Mechanism of inhibition of Ψ+ prion determinant propagation by a mutation of the N-terminus of the yeast Sup35 protein

被引:57
作者
Kochneva-Pervukhova, NV
Paushkin, SV
Kushnirov, VV
Cox, BS
Tuite, MF
Ter-Avanesyan, MD
机构
[1] Cardiol Res Ctr, Inst Expt Cardiol, Moscow 121552, Russia
[2] Univ Kent, Res Sch Biosci, Canterbury CT2 7NJ, Kent, England
基金
英国惠康基金;
关键词
prion; release factor eRF3; Saccharomyces cerevisiae; translation termination;
D O I
10.1093/emboj/17.19.5805
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The SUP35 gene of Saccharomyces cerevisiae encodes the polypeptide chain release factor eRF3. This protein (also called Sup35p) is thought to be able to undergo a heritable conformational switch, similarly to mammalian prions, giving rise to the cytoplasmically inherited Psi(+) determinant, A dominant mutation (PNM2 allele) in the SUP35 gene causing a Gly58-->Asp change in the Sup35p N-terminal domain eliminates Y+. Here we observed that the mutant Sup35p can be converted to the prion-like form in vitro, but such conversion proceeds slower than that of wild-type Sup35p. The overexpression of mutant Sup35p induced the de novo appearance of Psi(+) cells containing the prion-like form of mutant Sup35p, which was able to transmit its properties to wild-type Sup35p both in vitro and in vivo. Our data indicate that this Psi(+)-eliminating mutation does not alter the initial binding of Sup35p molecules to the Sup35p Psi(+)-specific aggregates, but rather inhibits its subsequent prion-like rearrangement and/or binding of the next Sup35p molecule to the growing prion-like Sup35p aggregate.
引用
收藏
页码:5805 / 5810
页数:6
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