The Intracellular Domain of Sortilin Interacts with Amyloid Precursor Protein and Regulates Its Lysosomal and Lipid Raft Trafficking

Miao Yang, Balaji Virassamy, Swarna Vijayaraj, Yoon Lim, Khalil Saadipour, Yan Jiang Wang, Yanchuang Han, Jin Hua Zhong, Carlos Morales, Xin-Fu Zhou

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    18 Citations (Scopus)

    Abstract

    The processing of Amyloid precursor protein (APP) is multifaceted, comprising of protein transport, internalization and sequential proteolysis. However, the exact mechanism of APP intracellular trafficking and distribution remains unclear. To determine the interaction between sortilin and APP and the effect of sortilin on APP trafficking and processing, we studied the binding site and its function by mapping experiments, colocalization, coimmunoprecipitation and sucrose gradient fractionation. We identified for the first time that sortilin interacts with APP at both N- and C-terminal regions. The sortilin-FLVHRY (residues 787-792) and APP-NPTYKFFE (residues 759-766) motifs are crucial for the C-terminal interaction. We also found that lack of the FLVHRY motif reduces APP lysosomal targeting and increases APP distribution in lipid rafts in co-transfected HEK293 cells. These results are consistent with our in vivo data where sortilin knockout mice showed a decrease of APP lysosomal distribution and an increase of APP in lipid rafts. We further confirmed that overexpression of sortilin-FLVHRY mutants failed to rescue the lysosomal degradation of APP. Thus, our data suggests that sortilin is implicated in APP lysosomal and lipid raft targeting via its carboxyl-terminal F/YXXXXF/Y motif. Our study provides new molecular insights into APP trafficking and processing.

    Original languageEnglish
    Article numbere63049
    Pages (from-to)e63049
    Number of pages13
    JournalPLoS One
    Volume8
    Issue number5
    DOIs
    Publication statusPublished - 2013

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    Yang, M., Virassamy, B., Vijayaraj, S., Lim, Y., Saadipour, K., Wang, Y. J., Han, Y., Zhong, J. H., Morales, C., & Zhou, X-F. (2013). The Intracellular Domain of Sortilin Interacts with Amyloid Precursor Protein and Regulates Its Lysosomal and Lipid Raft Trafficking. PLoS One, 8(5), e63049. [e63049]. https://doi.org/10.1371/journal.pone.0063049