In enzymology, an oligosaccharide-transporting ATPase (EC 3.6.3.18) is an enzyme that catalyzes the chemical reaction ATP + H2O + oligosaccharideout ADP + phosphate + oligosaccharidein The 3 substrates of this enzyme are ATP, H2O, and oligosaccharide, whereas its 3 products are ADP, phosphate, and oligosaccharide.