May play a role in sucrose-independent adherence to the pellicle-coated tooth surface. Endohydrolysis of (1->6)-alpha-D-glucosidic linkages in dextran. Optimum pH is 5.3. Optimum temperature is 39 degrees Celsius. Homodimer. Belongs to the glycosyl hydrolase 66 family. It is uncertain whether Met-1 or Met-5 is the initiator.