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2018 ; 38
(15
): ä Nephropedia Template TP
gab.com Text
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English Wikipedia
Prion Replication in the Mammalian Cytosol: Functional Regions within a Prion
Domain Driving Induction, Propagation, and Inheritance
#MMPMID29784771
Duernberger Y
; Liu S
; Riemschoss K
; Paulsen L
; Bester R
; Kuhn PH
; Schölling M
; Lichtenthaler SF
; Vorberg I
Mol Cell Biol
2018[Aug]; 38
(15
): ä PMID29784771
show ga
Prions of lower eukaryotes are transmissible protein particles that propagate by
converting homotypic soluble proteins into growing protein assemblies. Prion
activity is conferred by so-called prion domains, regions of low complexity that
are often enriched in glutamines and asparagines (Q/N). The compositional
similarity of fungal prion domains with intrinsically disordered domains found in
many mammalian proteins raises the question of whether similar sequence elements
can drive prion-like phenomena in mammals. Here, we define sequence features of
the prototype Saccharomyces cerevisiae Sup35 prion domain that govern prion
activities in mammalian cells by testing the ability of deletion mutants to
assemble into self-perpetuating particles. Interestingly, the amino-terminal
Q/N-rich tract crucially important for prion induction in yeast was dispensable
for the prion life cycle in mammalian cells. Spontaneous and template-assisted
prion induction, growth, and maintenance were preferentially driven by the
carboxy-terminal region of the prion domain that contains a putative soft amyloid
stretch recently proposed to act as a nucleation site for prion assembly. Our
data demonstrate that preferred prion nucleation domains can differ between lower
and higher eukaryotes, resulting in the formation of prions with strikingly
different amyloid cores.