Part of the energy-coupling factor (ECF) transporter complex CbiMNOQ involved in cobalt import. Presumably responsible for energy coupling to the transport system. Cofactor biosynthesis; adenosylcobalamin biosynthesis. Forms an energy-coupling factor (ECF) transporter complex composed of an ATP-binding protein (A component, CbiO), a transmembrane protein (T component, CbiQ) and 2 possible substrate-capture proteins (S components, CbiM and CbiN) of unknown stoichimetry. Belongs to the ABC transporter superfamily. Cobalt importer (TC 3.A.1.18.1) family.