Interaction of Alzheimer's beta -amyloid precursor family proteins with scaffold proteins of the JNK signaling cascade

The Journal of Biological Chemistry
H TaruToshiharu Suzuki

Abstract

We have isolated a novel protein based on its association with Drosophila APP-like protein (APPL), a homolog of the beta-amyloid precursor protein (APP) that is implicated in Alzheimer's disease. This novel APPL-interacting protein 1 (APLIP1) contains a Src homology 3 domain and a phosphotyrosine interaction domain and is expressed abundantly in neural tissues. The phosphotyrosine interaction domain of APLIP1 interacts with a sequence containing GYENPTY in the cytoplasmic domain of APPL. APLIP1 is highly homologous to the carboxyl-terminal halves of mammalian c-Jun NH(2)-terminal kinase (JNK)-interacting protein 1b (JIP1b) and 2 (JIP2), which also contain Src homology 3 and phosphotyrosine interaction domains. The similarity of APLIP1 to JIP1b and JIP2 includes interaction with component(s) of the JNK signaling pathway and with the motor protein kinesin and the formation of homo-oligomers. JIP1b interacts strongly with the cytoplasmic domain of APP (APPcyt), as APLIP1 does with APPL, but the interaction of JIP2 with APPcyt is weak. Overexpression of JIP1b slightly enhances the JNK-dependent threonine phosphorylation of APP in cultured cells, but that of JIP2 suppresses it. These observations suggest that the interactions of APP...Continue Reading

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Citations

Dec 18, 2013·ACS Chemical Neuroscience·Filipa I BaptistaOdete A B da Cruz e Silva
Jun 6, 2009·The Journal of Biological Chemistry·Lars M IttnerJürgen Götz
Jul 25, 2008·The Journal of Biological Chemistry·Toshiharu Suzuki, Tadashi Nakaya
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