Probably part of the ABC transporter complex MntABCD involved in manganese import. The complex is probably composed of two ATP-binding proteins (MntB), two transmembrane proteins (MntC and MntD) and a solute-binding protein (MntA) (Probable). Interacts with FloT (PubMed:23651456). Present in detergent-resistant membrane (DRM) fractions that may be equivalent to eukaryotic membrane rafts; these rafts include proteins involved in signaling, molecule trafficking and protein secretion. Repressed by MntR in the presence of manganese. Null mutant is very sensitive to manganese. Belongs to the bacterial solute-binding protein 9 family.