C. elegans PAT-4/ILK functions as an adaptor protein within integrin adhesion complexes

A. Craig Mackinnon, Hiroshi Qadota, Kenneth R. Norman, Donald G. Moerman, Benjamin D. Williams

Research output: Contribution to journalArticle

Abstract

Background: Mammalian integrin-linked kinase (ILK) was identified in a yeast two-hybrid screen for proteins binding the integrin β1 subunit cytoplasmic domain. ILK has been implicated in integrin-mediated signaling and is also an adaptor within integrin-associated cytoskeletal complexes. Results: We identified the C. elegans pat-4 gene in previous genetic screens for mutants unable to assemble integrin-mediated muscle cell attachments. Here, we report that pat-4 encodes the sole C. elegans homolog of ILK. In pat-4 null mutants, embryonic muscle cells form integrin foci, but the subsequent recruitment of vinculin and UNC-89 as well as actin and myosin filaments to these in vivo focal adhesion analogs is blocked. Conversely, PAT-4/ILK requires the ECM component UNC-52/perlecan, the transmembrane protein integrin, and the novel cytoplasmic attachment protein UNC-112 to be properly recruited to nascent attachments. Transgenically expressed "kinase-dead" ILK fully rescues pat-4 loss-of-function mutants. We also identify UNC-112 as a new binding partner for ILK. Conclusions: Our data strengthens the emerging view that ILK functions primarily as an adaptor protein within integrin adhesion complexes and identifies UNC-112 as a new ILK binding partner.

Original languageEnglish (US)
Pages (from-to)787-797
Number of pages11
JournalCurrent Biology
Volume12
Issue number10
DOIs
StatePublished - May 14 2002

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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