Involved in beta-(1-->2)glucan export which is required for crown gall tumor formation. Transmembrane domains (TMD) form a pore in the inner membrane and the ATP-binding domain (NBD) is responsible for energy generation (Probable). [(1->2)-beta-D-glucosyl](n)(in) + ATP + H2O = [(1->2)-beta-D-glucosyl](n)(out) + ADP + H(+) + phosphate Homodimer. In NdvA the ATP-binding domain (NBD) and the transmembrane domain (TMD) are fused. Belongs to the ABC transporter superfamily. Beta-(1-->2)glucan exporter (TC 3.A.1.108.1) family.