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• W3094494413 startingPage "1877" @default.
• W3094494413 abstract "Heterotetrameric adaptor protein (AP) complexes play key roles in protein sorting and transport vesicle formation in the endomembrane system of eukaryotic cells. One of these complexes, AP-4, was identified over 20 years ago but, up until recently, its function remained unclear. AP-4 associates with the trans-Golgi network (TGN) through interaction with small GTPases of the ARF family and recognizes transmembrane proteins (i.e. cargos) having specific sorting signals in their cytosolic domains. Recent studies identified accessory proteins (tepsin, RUSC2 and the FHF complex) that co-operate with AP-4, and cargos (amyloid precursor protein, ATG9A and SERINC3/5) that are exported from the TGN in an AP-4-dependent manner. Defective export of ATG9A from the TGN in AP-4-deficient cells was shown to reduce ATG9A delivery to pre-autophagosomal structures, impairing autophagosome formation and/or maturation. In addition, mutations in AP-4-subunit genes were found to cause neurological dysfunction in mice and a form of complicated hereditary spastic paraplegia referred to as ‘AP-4-deficiency syndrome’ in humans. These findings demonstrated that mammalian AP-4 is required for the development and function of the central nervous system, possibly through its role in the sorting of ATG9A for the maintenance of autophagic homeostasis. In this article, we review the properties and functions of AP-4, and discuss how they might explain the clinical features of AP-4 deficiency." @default.
• W3094494413 created "2020-10-29" @default.
• W3094494413 creator A5045943797 @default.
• W3094494413 creator A5074435943 @default.
• W3094494413 creator A5081989475 @default.
• W3094494413 date "2020-10-21" @default.
• W3094494413 modified "2023-09-23" @default.
• W3094494413 title "The role of AP-4 in cargo export from the <i>trans</i>-Golgi network and hereditary spastic paraplegia" @default.
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