ADP-ribosylation factor-binding protein GGA3 (GGA3)

ADP-ribosylation factor-binding protein GGA3 (GGA3) is an adaptor protein that regulates intracellular protein trafficking, particularly the sorting and recycling of receptors and transporters between the trans-Golgi network, endosomes, and the plasma membrane. GGA3 interacts directly with cargo proteins via DXXLL sorting motifs and binds activated ARF GTPases to promote clathrin-mediated vesicle formation at the Golgi and endosomes. GGA3 plays critical roles in mediating the recycling or degradation of important membrane proteins including the TrkA neurotrophin receptor, Met receptor, BACE1 enzyme (implicated in Alzheimer's), and GPCRs, impacting cell signaling, survival, and protein turnover. Genetic variants in GGA3 are associated with nephrotic syndrome and pigmentary disorders, and its function has implications for disease mechanisms involving membrane trafficking, such as cancer and neurodegeneration. Key molecular features: Contains a VHS domain (binds DXXLL motif), GAT domain (binds ARF-GTP and ubiquitin), hinge region (binds clathrin), and GAE domain (accessory protein interactions). Localized at the trans-Golgi network and endosomal compartments, mediating bidirectional trafficking and receptor fate decisions (degradation vs. recycling). Essential for proper receptor sorting and sustained signaling, especially in neuronal survival pathways via TrkA-Akt axis. No direct therapeutics currently target GGA3, but its modulation affects the stability and localization of several major receptors and enzymes of therapeutic interest.

Other names

Golgi-associated, gamma adaptin ear-containing, ARF-binding protein 3Golgi-localized, gamma ear-containing, ARF-binding protein 3ADP-ribosylation factor-binding protein GGA3KIAA0154

Drugs targeting receptors that are sorted or recycled by GGA3 (e.g., TrkA, Met) may be affected in terms of cellular localization, stability, and signaling duration, but there are no approved drugs targeting GGA3 directly