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Endofin is required for HD-PTP and ESCRT-0 interdependent endosomal sorting of ubiquitinated transmembrane cargoes

ABSTRACT: Summary Internalized and ubiquitinated signaling receptors are silenced by their intraluminal budding into multivesicular bodies aided by the endosomal sorting complexes required for transport (ESCRT) machinery. HD-PTP, an ESCRT protein, forms complexes with ESCRT-0, -I and -III proteins, and binds to Endofin, a FYVE-domain protein confined to endosomes with poorly understood roles. Using proximity biotinylation, we showed that Endofin forms a complex with ESCRT constituents and Endofin depletion increased integrin α5-and EGF-receptor plasma membrane density and stability by hampering their lysosomal delivery. This coincided with sustained receptor signaling and increased cell migration. Complementation of Endofin- or HD-PTP-depleted cells with wild-type Endofin or HD-PTP, but not with mutants harboring impaired Endofin/HD-PTP association or cytosolic Endofin, restored EGFR lysosomal delivery. Endofin also promoted Hrs indirect interaction with HD-PTP. Jointly, our results indicate that Endofin is required for HD-PTP and ESCRT-0 interdependent sorting of ubiquitinated transmembrane cargoes to ensure efficient receptor desensitization and lysosomal delivery. Graphical abstract Highlights • Endofin forms a complex with ESCRT proteins and EGFR on early endosomes• Endofin is required for activated EGFR and integrin α5 lysosomal targeting• Endofin promotes HD-PTP colocalization with ESCRT-0 and -III on early endosomes• Endofin depletion increases cell migration and sustains receptor signaling Biological sciences; Molecular biology; Cell biology

SUBMITTER: Kazan J

PROVIDER: S-EPMC8567383 | biostudies-literature |

REPOSITORIES: biostudies-literature

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