Vacuolar aspartate and glutamate exporter; vacuolar membrane localized transporter involved in the export of acidic amino acids and in the export of both acidic and neutral amino acids in response to nitrogen starvation, important for viability and spore formation; member of a family of seven genes (AVT1-7) related to vesicular GABA-glycine transporters; AVT6 has a paralog, AVT5, that arose from the whole genome duplication