Autophagy is a major survival survival mechanism in which eukaryotes recycle cellular nutrients during stress conditions. Atg22, Avt3 and Avt4 are partially redundant vacuolar effluxes, which mediate the efflux of leucine and other amino acids resulting from autophagy [1]. This family also includes other transporter proteins.

1: Permeases recycle amino acids resulting from autophagy. Yang Z, Klionsky DJ; Autophagy. 2007;3:149-150. PMID:17204852