– AGA (Aspartylglucosaminidase) is an amidohydrolase enzyme involved in the catabolism of N-linked oligosaccharides of glycoproteins. This gene encodes a member of the N-terminal nucleophile (Ntn) hydrolase family of proteins. The encoded preproprotein is proteolytically processed to generate alpha and beta chains that comprise the mature enzyme. Diseases associated with AGA include Aspartylglucosaminuria and Lysosomal Storage Disease. An important paralog of this gene is ASRGL1.