Probably part of the ABC transporter complex YxeMNO that could be involved in amino-acid import. May transport S-methylcysteine. Probably responsible for the translocation of the substrate across the membrane (Probable). The complex is composed of two ATP-binding proteins (YxeO), two transmembrane proteins (YxeN) and a solute-binding protein (YxeM). More strongly expressed in the presence of methionine than in the presence of sulfate. Belongs to the binding-protein-dependent transport system permease family.