The function of ENSG00000257335 (MGAM, maltase-glucoamylase) is as follows. Alpha-(1,4) exo-glucosidase involved in breakdown of dietary starch oligosaccharides in small intestine. Cleaves the non-reducing alpha-(1,4)-linked glucose residue in linear dextrins with retention of anomeric center stereochemistry (PubMed:12547908, PubMed:18036614, PubMed:18356321, PubMed:22058037, PubMed:27480812). Mainly hydrolyzes short length oligomaltoses having two to seven glucose residues (PubMed:12547908, PubMed:18036614, PubMed:18356321, PubMed:22058037, PubMed:27480812). Can cleave alpha-(1,2), alpha-(1,3) and alpha-(1,6) glycosidic linkages with lower efficiency, whereas beta glycosidic linkages are usually not hydrolyzed (PubMed:27480812). {ECO:0000269|PubMed:12547908, ECO:0000269|PubMed:18036614, ECO:0000269|PubMed:18356321, ECO:0000269|PubMed:22058037, ECO:0000269|PubMed:27480812}.