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GGA1

This gene encodes a member of the Golgi-localized, gamma adaptin ear-containing, ARF-binding (GGA) protein family. Members of this family are ubiquitous coat proteins that regulate the trafficking of proteins between the trans-Golgi network and the lysosome. These proteins share an amino-terminal VHS domain which mediates sorting of the mannose 6-phosphate receptors at the trans-Golgi network. They also contain a carboxy-terminal region with homology to the ear domain of gamma-adaptins. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene.
Protein class

Transporters

Predicted location

Intracellular

Single cell type specificity

Cell type enhanced (Late spermatids, Spermatocytes)

Immune cell specificity

Low immune cell specificity

Cell line specificity

Low cell line specificity

Interaction

Monomer (Probable). Interacts with GGA2 and GGA3 (PubMed:14638859). Binds to clathrin and activated ARFs, including ARF1, ARF5 and ARF6 (PubMed:11301005, PubMed:11950392, PubMed:12679809, PubMed:15143060, PubMed:22522702). Interacts with RABEP1 (PubMed:12505986, PubMed:15143060, PubMed:14665628). Interacts with RABGEF1 (PubMed:12505986, PubMed:15143060). Interacts with the type-I membrane proteins LRP3, M6PR/CD-MPR and IGF2R/CI-MPR (PubMed:11390366, PubMed:11387475, PubMed:12060753). Interacts (via N-terminal VHS domain) with SORL1/sorLA and SORT1 (via C-terminal cytosolic domain) (PubMed:11821067, PubMed:17855360, PubMed:20015111). Interacts with EPN4 (PubMed:12538641). Interacts with CCDC91 (PubMed:12808037, PubMed:12858163). Interacts with HEATR5B/p200a (PubMed:12808037, PubMed:15758025). Interacts with SYNRG/gamma-synergin (PubMed:10814529, PubMed:12808037, PubMed:15758025). Interacts (via GAE doamin) with NECAP1 and NECAP2 (PubMed:14665628). Interacts (via GAE domain) with AFTPH/aftiphilin (PubMed:14665628, PubMed:15758025). Interacts with TSG101 and UBC (PubMed:14660606, PubMed:15143060). Interacts with RNF11 (PubMed:20676133). Interacts (via VHS domain) with BACE1 (via DXXLL motif); the interaction highly increases when BACE1 is phosphorylated at 'Ser-498' (PubMed:14567678, PubMed:15886016). Interacts with CNST (By similarity). Interacts with ADRA2B (PubMed:27901063). Interacts with ARL3; the interaction recruits, in collaboration with RABEP1, PKD1:PKD2 complex to trans-Golgi network and is required for ciliary targeting (By similarity).

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