Reference: Chernova TA, et al. (2011) Prion induction by the short-lived, stress-induced protein lsb2 is regulated by ubiquitination and association with the actin cytoskeleton. Mol Cell 43(2):242-52

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Abstract


Yeast prions are self-perpetuating, QN-rich amyloids that control heritable traits and serve as a model for mammalian amyloidoses. De novo prion formation by overproduced prion protein is facilitated by other aggregated QN-rich protein(s) and is influenced by alterations of protein homeostasis. Here we explore the mechanism by which the Las17-binding protein Lsb2 (Pin3) promotes conversion of the translation termination factor Sup35 into its prion form, [PSI(+)]. We show that Lsb2 localizes with some Sup35 aggregates and that Lsb2 is a short-lived protein whose levels are controlled via the ubiquitin-proteasome system and are dramatically increased by stress. Loss of Lsb2 decreases stability of [PSI(+)] after brief heat shock. Mutations interfering with Lsb2 ubiquitination increase prion induction, while a mutation eliminating association of Lsb2 with the actin cytoskeleton blocks its aggregation and prion-inducing ability. These findings directly implicate the UPS and actin cytoskeleton in regulating prions via a stress-inducible QN-rich protein.CI - Copyright (c) 2011 Elsevier Inc. All rights reserved.

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Journal Article
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Chernova TA, Romanyuk AV, Karpova TS, Shanks JR, Ali M, Moffatt N, Howie RL, O'Dell A, McNally JG, Liebman SW, ... Show all
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