The UBL domain of PLIC-1 regulates aggresome formation.

Abstract:

:Defects in protein folding and the proteasomal pathway have been linked with many neurodegenerative diseases. PLIC-1 (protein linking IAP to the cytoskeleton) is a ubiquitin-like protein that binds to the ubiquitin-interacting motif (UIM) of the proteasomal subunit S5a. Here, we show that PLIC-1 also binds to the UIM proteins ataxin 3--a deubiquitinating enzyme--HSJ1a--a co-chaperone--and EPS15 (epidermal growth factor substrate 15)--an endocytic protein. Using a polyglutamine (polyQ) disease model, we found that both endogenous PLIC-1 and EPS15 localize to perinuclear aggresomes, and that polyQ enhances their in vivo interaction. We show that knockdown of PLIC-1 and EPS15 by RNA interference reduces aggresome formation. In addition, PLIC-1(DeltaUBL) functions as a dominant-negative mutant, blocking both polyQ transport to aggresomes and the association of EPS15 with dispersed aggregates. We also show that PLIC-1 is upregulated by arsenite-induced protein misfolding. These results indicate a role for PLIC-1 in the protein aggregation-stress pathway, and we propose a novel function for the ubiquitin-like (UBL) domain--by means of UBL-UIM interactions--in transport to aggresomes.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Heir R,Ablasou C,Dumontier E,Elliott M,Fagotto-Kaufmann C,Bedford FK

doi

10.1038/sj.embor.7400823

subject

Has Abstract

pub_date

2006-12-01 00:00:00

pages

1252-8

issue

12

eissn

1469-221X

issn

1469-3178

pii

7400823

journal_volume

7

pub_type

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