Putative ATP-binding protein, and an energy-coupling component of capsule polysaccharide export apparatus. ATP + H2O + capsular polysaccharide-[capsular polysaccharide-binding protein]Side 1 = ADP + phosphate + capsular polysaccharideSide 2 + [capsular polysaccharide-binding protein]Side 1. Belongs to the ABC transporter superfamily.