Required for resistance to linearmycins, a family of antibiotic-specialized metabolites produced by some streptomycetes (PubMed:26647299, PubMed:28461449). Part of the ABC transporter complex LnrLMN that probably facilitates linearmycin removal from the membrane. Responsible for the translocation of the substrate across the membrane (PubMed:28461449). Also mediates KinC-dependent biofilm morphology (PubMed:28461449). The complex is composed of two ATP-binding proteins (LnrL) and two transmembrane proteins (LnrM and LnrN). Induced in response to linearmycins and other polyenes via the two-component regulatory system LnrJ/LnrK. Belongs to the ABC-2 integral membrane protein family.