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Krammer, C.* ; Suhre, M.H.* ; Kremmer, E. ; Diemer, C.* ; Hess, S.* ; Schatzl, H.M.* ; Scheibel, T.* ; Vorberg, I.*

Prion protein/protein interactions: Fusion with yeast Sup35p-NM modulates cytosolic PrP aggregation in mammalian cells.

FASEB J. 22, 762-773 (2008)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
In mammalian prion diseases, an abnormally folded, aggregated form of the prion protein (PrP(Sc)) appears to catalyze a conformational switch of its cellular isoform (PrP(C)) to an aggregated state. A similar prion-like phenomenon has been reported for the Saccharomyces cerevisiae translation termination factor Sup35p that can adopt a self-propagating conformation. We have compared aggregation propensities of chimeric proteins derived from the Sup35p prion domain NM and PrP in vitro and in the cytosol of mammalian cells. Sup35p-NM and PrP displayed strikingly different aggregation behaviors when expressed in mammalian cells, with NM remaining soluble and cytosolic PrP spontaneously aggregating due to the globular domain of PrP. When fused to PrP(90-230), Sup35p-M exhibited an inhibitory effect for nucleation but increased aggregate growth, potentially by facilitating recruitment of newly synthesized chimeric proteins into the growing aggregates. This effect, however, could, to some extent, be counteracted by the prion-forming region Sup35p-N, thereby increasing aggregate frequency. Interestingly, a lowered nucleation rate was also observed in the presence of the amino-terminal region of PrP, suggesting that Sup35p-M and PrP(23-90) share some biological function in prion protein assembly. Our results provide new insights into prion protein aggregation behaviors, demonstrating the impact of dynamic interactions between prion domains and suggesting that aggregation of yeast and mammalian prion proteins is strongly influenced by yet unidentified cellular conditions or factors.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter amyloid; protein misfolding; seeding; nucleation
ISSN (print) / ISBN 0892-6638
e-ISSN 1530-6860
Zeitschrift FASEB Journal
Quellenangaben Band: 22, Heft: 3, Seiten: 762-773 Artikelnummer: , Supplement: ,
Verlag Wiley
Verlagsort Bethesda, Md.
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Molecular Immunology (IMI)