AP4E1

AP4E1 is a member of the adaptor complexes large subunit protein family. These proteins are components of the heterotetrameric adaptor protein complexes, which play important roles in the secretory and endocytic pathways by mediating vesicle formation and

Full Name

Adaptor Related Protein Complex 4 Epsilon 1 Subunit

Function

Component of the adaptor protein complex 4 (AP-4). Adaptor protein complexes are vesicle coat components involved both in vesicle formation and cargo selection. They control the vesicular transport of proteins in different trafficking pathways (PubMed:10066790, PubMed:10436028). AP-4 forms a non clathrin-associated coat on vesicles departing the trans-Golgi network (TGN) and may be involved in the targeting of proteins from the trans-Golgi network (TGN) to the endosomal-lysosomal system. It is also involved in protein sorting to the basolateral membrane in epithelial cells and the proper asymmetric localization of somatodendritic proteins in neurons. AP-4 is involved in the recognition and binding of tyrosine-based sorting signals found in the cytoplasmic part of cargos, but may also recognize other types of sorting signal (Probable).

Biological Process

Post-Golgi vesicle-mediated transport Source: Reactome
Protein localization Source: UniProtKB
Protein targeting Source: UniProtKB
Receptor-mediated endocytosis Source: GO_Central

Cellular Location

Trans-Golgi network membrane

Involvement in disease

Spastic paraplegia 51, autosomal recessive (SPG51): A form of spastic paraplegia, a neurodegenerative disorder characterized by a slow, gradual, progressive weakness and spasticity of the lower limbs. SPG51 is a non-progressive disorder of movement and/or posture resulting from defects in the developing central nervous system. Affected individuals manifest motor and posture impairments often associated with epilepsy and disturbances of cognition, behavior, sensation, and communication.
Stuttering, familial persistent 1 (STUT1): A familial form of stuttering, a disturbance in the normal fluency and time patterning of speech, characterized by frequent repetitions or prolongations of sounds or syllables, and by interruptions of speech known as blocks. STUT1 inheritance is autosomal dominant.