Probably part of the energy-coupling factor (ECF) transporter complex LarMNQO involved in nickel import. May form an energy-coupling factor (ECF) transporter complex composed of an ATP-binding protein (A component, LarO), a transmembrane protein (T component, LarQ) and a fused possible substrate-capture protein (S component, LarMN) of unknown stoichiometry. Induced by L-lactate but not by a racemic mixture of DL-lactate. Makes part of the larR(MN)QO operon. Belongs to the CbiM family. NikM subfamily.