RRC ID 4485
Author Rodrigues AJ, Neves-Carvalho A, Ferro A, Rokka A, Corthals G, Logarinho E, Maciel P.
Title ATX-3, CDC-48 and UBXN-5: a new trimolecular complex in Caenorhabditis elegans.
Journal Biochem. Biophys. Res. Commun.
Abstract Ataxin-3 is the protein involved in Machado-Joseph disease, a neurodegenerative disorder caused by a polyglutamine expansion. Ataxin-3 binds ubiquitylated proteins and acts as a deubiquitylating enzyme in vitro. It was previously proposed that ataxin-3, along with the VCP/p97 protein, escorts ubiquitylated substrates for proteasomal degradation, although other players of this escort complex were not identified yet. In this work, we show that the Caenorhabditis elegans ataxin-3 protein (ATX-3) interacts with both VCP/p97 worm homologs, CDC-48.1 and CDC-48.2 and we map the interaction domains. We describe a motility defect in both ATX-3 and CDC-48.1 mutants and, in addition, we identify a new protein interactor, UBXN-5, potentially an adaptor of the CDC-48-ATX-3 escort complex. CDC-48 binds to both ATX-3 and UBXN-5 in a non-competitive manner, suggesting the formation of a trimolecular complex. Both CDC-48 and ATX-3, but not UBXN-5, were able to bind K-48 polyubiquitin chains, the standard signal for proteasomal degradation. Additionally, we describe several common interactors of ATX-3 and UBXN-5, some of which can be in vivo targets of this complex.
Volume 386(4)
Pages 575-81
Published 2009-9-4
DOI 10.1016/j.bbrc.2009.06.092
PII S0006-291X(09)01199-1
PMID 19545544
MeSH Adaptor Proteins, Signal Transducing / genetics Adaptor Proteins, Signal Transducing / metabolism* Adenosine Triphosphatases / genetics Adenosine Triphosphatases / metabolism* Animals Ataxin-3 Caenorhabditis elegans / genetics Caenorhabditis elegans / metabolism* Caenorhabditis elegans Proteins / genetics Caenorhabditis elegans Proteins / metabolism* Cell Cycle Proteins / genetics Cell Cycle Proteins / metabolism* Multiprotein Complexes / genetics Multiprotein Complexes / metabolism* Nerve Tissue Proteins / genetics Nerve Tissue Proteins / metabolism* Protein Interaction Domains and Motifs / genetics Protein Interaction Mapping Valosin Containing Protein
IF 2.559
Times Cited 10
C.elegans tm544 tm659 tm3515