β-Glucosidase 3A, Bacteroides ovatus (EC 3.2.1.21), is a glucosidase enzyme that specifically targets β1→4 glycosidic bonds linking two glucose or glucose-substituted molecules, such as those found in disaccharides like cellobiose. As a member of the cellulase family, β-Glucosidase plays a role in breaking down cellulose and related polysaccharides. It acts as an exocellulase showing specificity towards various β-D-glucoside substrates, catalyzing the hydrolysis of the terminal non-reducing residues of β-D-glucosides to release glucose.