Journal
JOURNAL OF CELL BIOLOGY
Volume 220, Issue 2, Pages -Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.202002075
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Funding
- Wellcome Trust [086598, 214272, 100140]
- Canadian Cancer Society [704301, 705938]
- Canadian Institutes of Health Research [FDN 143301]
- Parkinson Canada
- Canada Foundation for Innovation
- Government of Ontario
- Genome Canada
- Ontario Genomics [OGI-139]
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AP-5/SPG11/SPG15 recruitment is enhanced in starved cells through coincidence detection, requiring both PI3P and Rag GTPases. The FYVE domain of SPG15 plays a crucial role in PI3P binding, with GDP-locked RagC promoting recruitment and GTP-locked RagA preventing it.
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, localizes 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.
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