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  • Title: LRRK1 phosphorylation of Rab7 at S72 links trafficking of EGFR-containing endosomes to its effector RILP.
    Author: Hanafusa H, Yagi T, Ikeda H, Hisamoto N, Nishioka T, Kaibuchi K, Shirakabe K, Matsumoto K.
    Journal: J Cell Sci; 2019 Jun 03; 132(11):. PubMed ID: 31085713.
    Abstract:
    Ligand-induced activation of epidermal growth factor receptor (EGFR) initiates trafficking events that re-localize the receptor from the cell surface to intracellular endocytic compartments. EGFR-containing endosomes are transported to lysosomes for degradation by the dynein-dynactin motor protein complex. However, this cargo-dependent endosomal trafficking mechanism remains largely uncharacterized. Here, we show that GTP-bound Rab7 is phosphorylated on S72 by leucine-rich repeat kinase 1 (LRRK1) at the endosomal membrane. This phosphorylation promotes the interaction of Rab7 (herein referring to Rab7a) with its effector RILP, resulting in recruitment of the dynein-dynactin complex to Rab7-positive vesicles. This, in turn, facilitates the dynein-driven transport of EGFR-containing endosomes toward the perinuclear region. These findings reveal a mechanism regulating the cargo-specific trafficking of endosomes.
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