Probable subunit of an amino acid transporter involved in the regulation of the amino acid metabolism. Stimulates amino acid export by activating nonselective amino acid facilitators. Required the interaction with the RING-type E3 ubiquitin-protein ligase LOG2 to fulfill its function. Plays a role in the Gln export at hydathodes, at xylem parenchyma into xylem sap and from mesophyll into leaf apoplasm. Acts upstream genes involved in the salicylic acid (SA) pathway and in the geminivirus-host interaction. Interacts with LOG2. Expressed in the vascular tissues and in hydathodes. Expressed in the phloem and xylem (at the protein level). The VIMAG motif is necessary for the function of the protein. Ubiquitinated by LOG2 (in vitro). Overexpression of GLUTAMINE DUMPER 1 leads to free amino acid levels accumulation, plant size decrease, hypersecretion of glutamine from hydathodes and to a full resistance to geminivirus infection (Ref.9, PubMed:15208395, PubMed:20042021, PubMed:20018597). Belongs to the GLUTAMINE DUMPER 1 (TC 9.B.60) family.