Lipid Droplets Are Essential for Efficient Clearance of Cytosolic Inclusion Bodies.

Abstract:

:Exposing cells to folding stress causes a subset of their proteins to misfold and accumulate in inclusion bodies (IBs). IB formation and clearance are both active processes, but little is known about their mechanism. To shed light on this issue, we performed a screen with over 4,000 fluorescently tagged yeast proteins for co-localization with a model misfolded protein that marks IBs during folding stress. We identified 13 proteins that co-localize to IBs. Remarkably, one of these IB proteins, the uncharacterized and conserved protein Iml2, exhibited strong physical interactions with lipid droplet (LD) proteins. Indeed, we here show that IBs and LDs are spatially and functionally linked. We further demonstrate a mechanism for IB clearance via a sterol-based metabolite emanating from LDs. Our findings therefore uncover a function for Iml2 and LDs in regulating a critical stage of cellular proteostasis.

journal_name

Dev Cell

journal_title

Developmental cell

authors

Moldavski O,Amen T,Levin-Zaidman S,Eisenstein M,Rogachev I,Brandis A,Kaganovich D,Schuldiner M

doi

10.1016/j.devcel.2015.04.015

subject

Has Abstract

pub_date

2015-06-08 00:00:00

pages

603-10

issue

5

eissn

1534-5807

issn

1878-1551

pii

S1534-5807(15)00279-8

journal_volume

33

pub_type

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