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2015 ; 14
(ä): 174
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Mammalian prion protein (PrP) forms conformationally different amyloid
intracellular aggregates in bacteria
#MMPMID26536866
Macedo B
; Sant'Anna R
; Navarro S
; Cordeiro Y
; Ventura S
Microb Cell Fact
2015[Nov]; 14
(ä): 174
PMID26536866
show ga
BACKGROUND: An increasing number of proteins are being shown to assemble into
amyloid structures that lead to pathological states. Among them, mammalian prions
outstand due to their ability to transmit the pathogenic conformation, becoming
thus infectious. The structural conversion of the cellular prion protein
(PrP(C)), into its misfolded pathogenic form (PrP(Sc)) is the central event of
prion-driven pathologies. The study of the structural properties of intracellular
amyloid aggregates in general and of prion-like ones in particular is a
challenging task. In this context, the evidence that the inclusion bodies formed
by amyloid proteins in bacteria display amyloid-like structural and functional
properties make them a privileged system to model intracellular amyloid
aggregation. RESULTS: Here we provide the first demonstration that recombinant
murine PrP and its C-terminal domain (90-231) attain amyloid conformations inside
bacteria. Moreover, the inclusions formed by these two PrP proteins display
conformational diversity, since they differ in fibril morphology, binding
affinity to amyloid dyes, stability, resistance to proteinase K digestion and
neurotoxicity. CONCLUSIONS: Overall, our results suggest that modelling PrP
amyloid formation in microbial cell factories might open an avenue for a better
understanding of the structural features modulating the pathogenic impact of this
intriguing protein.