Adaptor protein complex 4 subunit beta-1 (AP4B1)

Adaptor protein complex 4 subunit beta-1 is a component of the AP-4 heterotetrameric complex, which also includes the subunits ε (epsilon), μ4 (mu-4), and σ4 (sigma-4). AP-4 complex plays an essential role in the sorting and intracellular trafficking of specific membrane proteins from the trans-Golgi network to endosomal compartments. The AP-4 complex is structurally related to other adaptor complexes (AP-1, AP-2, AP-3) but has unique features, such as a truncated beta-appendage[4]. The AP-4 complex is required for normal brain development and neuronal function, with mutations or deficiency in its subunits (including AP4B1) causing severe intellectual disability and progressive spastic paraplegia[1][6]. Currently, AP4B1 is not considered a classical therapeutic target such as a receptor, enzyme, or transporter, and there are no known drugs that target this protein directly. The primary clinical relevance of AP4B1 is its role in certain hereditary neurodevelopmental disorders[1][6][9].

Other names

AP-4 complex subunit beta-1AP4B1