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. Acts upstream genes involved in the salicylic acid (SA) pathway and in the geminivirus-host interaction. Expressed in the vascular tissues. Also detected in anthers. By geminivirus (BSCTV) infection. The VIMAG motif is necessary for the function of the protein. Overexpression of GLUTAMINE DUMPER 3 leads to free amino acid levels accumulation, plant size decrease and to an enhanced resistance to geminivirus infection (Ref.7, PubMed:20042021, PubMed:20018597). Belongs to the GLUTAMINE DUMPER 1 (TC 9.B.60) family.