Part of the ABC transporter complex RbsABC involved in ribose import. Probably responsible for the translocation of the substrate across the membrane. (Microbial infection) Probably transports the toxic C-terminal region of CdiA from D.dadantii strain 3937 across the inner membrane to the cytoplasm, where CdiA has a toxic effect. Toxin transport is strain-specific, mutations in this gene do not confer resistance to several other tested CdiA toxins. The complex is composed of an ATP-binding protein (RbsA), two transmembrane proteins (RbsC) and a solute-binding protein (RbsB). Disruption confers resistance to cellular contact-dependent growth inhibition (CDI) CdiA of D.dadantii strain 3937, but not to several other tested CdiA toxins. Belongs to the binding-protein-dependent transport system permease family. AraH/RbsC subfamily.