The Mechanism of Prion Inhibition by HET-S - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Molecular Cell Année : 2010

The Mechanism of Prion Inhibition by HET-S

Résumé

HET-S (97% identical to HET-s) has an N-terminal globular domain that exerts a prion-inhibitory effect in cis on its own prion-forming domain (PFD) and in trans on HET-s prion propagation. We show that HET-S fails to form fibrils in vitro and that it inhibits HET-s PFD fibrillization in trans. In vivo analyses indicate that beta-structuring of the HET-S PFD is required for HET-S activity. The crystal structures of the globular domains of HET-s and HET-S are highly similar, comprising a helical fold, while NMR-based characterizations revealed no differences in the conformations of the PFDs. We conclude that prion inhibition is not encoded by structure but rather in stability and oligomerization properties: when HET-S forms a prion seed or is incorporated into a HET-s fibril via its PFD, the beta-structuring in this domain induces a change in its globular domain, generating a molecular species that is incompetent for fibril growth.

Dates et versions

hal-02407056 , version 1 (12-12-2019)

Identifiants

Citer

Jason Greenwald, Carolin Buhtz, Christiane Ritter, Witek Kwiatkowski, Senyon Choe, et al.. The Mechanism of Prion Inhibition by HET-S. Molecular Cell, 2010, 38 (6), pp.889-899. ⟨10.1016/j.molcel.2010.05.019⟩. ⟨hal-02407056⟩

Collections

CNRS IPBS
45 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More