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Rag GTPases and Phosphatidylinositol 3-Phosphate Mediate Recruitment of the AP-5/SPG11/SPG15 Complex

By Margaret S Robinson, Jennifer Hirst, Geoffrey G Hesketh, Anne-Claude Gingras

Posted 28 Oct 2020
bioRxiv DOI: 10.1101/2020.10.27.357723

Adaptor protein complex 5 (AP-5) and its partners, SPG11 and SPG15, are recruited onto late endosomes and lysosomes. Here we show that recruitment of AP-5/SPG11/SPG15 is enhanced in starved cells, and occurs by coincidence detection, requiring both phosphatidylinositol 3-phosphate (PI3P) and Rag GTPases. PI3P binding is via the SPG15 FYVE domain, which on its own localises to early endosomes. GDP-locked RagC promotes recruitment of AP-5/SPG11/SPG15 while GTP-locked RagA prevents its recruitment. Our results uncover an interplay between AP-5/SPG11/SPG15 and the mTORC1 pathway, and help to explain the phenotype of AP-5/SPG11/SPG15 deficiency in patients, including the defect in autophagic lysosome reformation. ### Competing Interest Statement The authors have declared no competing interest.

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