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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Mol+Microbiol
2014 ; 93
(5
): 1043-56
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Prion-promoted phosphorylation of heterologous amyloid is coupled with
ubiquitin-proteasome system inhibition and toxicity
#MMPMID25039275
Yang Z
; Stone DE
; Liebman SW
Mol Microbiol
2014[Sep]; 93
(5
): 1043-56
PMID25039275
show ga
Many neurodegenerative diseases are associated with conversion of a soluble
protein into amyloid deposits, but how this is connected to toxicity remains
largely unknown. Here, we explore mechanisms of amyloid associated toxicity using
yeast. [PIN(+)], the prion form of the Q/N-rich Rnq1 protein, was known to
enhance aggregation of heterologous proteins, including the overexpressed
Q/N-rich amyloid forming domain of Pin4 (Pin4C), and Pin4C aggregates were known
to attract chaperones, including Sis1. Here we show that in [PIN(+)] but not
[pin(-)] cells, overexpression of Pin4C is deadly and linked to
hyperphosphorylation of aggregated Pin4C. Furthermore, Pin4C aggregation,
hyperphosphorylation and toxicity are simultaneously reversed by Sis1
overexpression. Toxicity may result from proteasome overload because
hyperphosphorylated Pin4C aggregation is associated with reduced degradation of a
ubiquitin-protein degradation reporter. Finally, hyperphosphorylation of
endogenous full-length Pin4 was also facilitated by [PIN(+)], revealing that a
prion can regulate post-translational modification of another protein.