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We identified a novel human homologue of the rat FE65 gene, hFE65L, by screening the cytoplasmic domain of beta-amyloid precursor protein (beta PP) with the "interaction trap." The cytoplasmic domains of the beta PP homologues, APLP1 and APLP2 (amyloid precursor-like proteins), were also tested for interaction with hFE65L. APLP2, but not APLP1, was found to interact with hFE65L. We confirmed these interactions in vivo by successfully coimmunoprecipatating endogenous beta PP and APLP2 from mammalian cells overexpressing a hemagglutinin-tagged fusion of the C-terminal region of hFE65L. We report the existence of a human FE65 gene family and evidence supporting specific interactions between members of the beta PP and FE65 protein families. Sequence analysis of the FE65 human gene family reveals the presence of two phosphotyrosine interaction (PI) domains. Our data show that a single PI domain is sufficient for binding of hFE65L to the cytoplasmic domain of beta PP and APLP2. The PI domain of the protein, Shc, is known to interact with the NPXYp motif found in the cytoplasmic domain of a number of different growth factor receptors. Thus, it is likely that the PI domains present in the C-terminal moiety of the hFE65L protein bind the NPXY motif located in the cytoplasmic domain of beta PP and APLP2.

Association of a novel human FE65-like protein with the cytoplasmic domain of the beta-amyloid precursor protein.