The Erbin PDZ domain binds with high affinity and specificity to the carboxyl termini of delta-catenin and ARVCF - PubMed (original) (raw)
. 2002 Apr 12;277(15):12906-14.
doi: 10.1074/jbc.M200818200. Epub 2002 Jan 30.
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- PMID: 11821434
- DOI: 10.1074/jbc.M200818200
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The Erbin PDZ domain binds with high affinity and specificity to the carboxyl termini of delta-catenin and ARVCF
Richard P Laura et al. J Biol Chem. 2002.
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Abstract
Erbin is a recently described member of the LAP (leucine-rich repeat and PDZ domain) protein family. We used a C-terminally displayed phage peptide library to identify optimal ligands for the Erbin PDZ domain. Phage-selected peptides were type 1 PDZ ligands that bound with high affinity and specificity to the Erbin PDZ domain in vitro. These peptides most closely resembled the C-terminal PDZ domain-binding motifs of three p120-related catenins: delta-catenin, ARVCF, and p0071 (DSWV-COOH). Analysis of the interactions of the Erbin PDZ domain with synthetic peptides matching the C termini of ARVCF or delta-catenin also demonstrated specific high affinity binding. We characterized the interactions between the Erbin PDZ domain and both ARVCF and delta-catenin in vitro and in vivo. The Erbin PDZ domain co-localized and coprecipitated with ARVCF or delta-catenin complexed with beta-catenin and E/N-cadherin. Mutagenesis and peptide competition experiments showed that the association of Erbin with the cadherin-catenin complex was mediated by the interaction of its PDZ domain with the C-terminal PDZ domain-binding motifs (DSWV-COOH) of ARVCF and delta-catenin. Finally, we showed that endogenous delta-catenin and Erbin co-localized in and co-immunoprecipitated from neurons. These results suggest that delta-catenin and ARVCF may function to mediate the association of Erbin with the junctional cadherin-catenin complex. They also demonstrate that C-terminal phage-display technology can be used to predict physiologically relevant ligands for PDZ domains.
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