Participates in a thiamine pyrimidine salvage pathway as part of the ABC transporter complex ThiXYZ involved in the import of thiamine degradation products such as the formylaminopyrimidine N-formyl-4-amino-5-aminomethyl-2-methylpyrimidine (FAMP). Is probably responsible for the translocation of the substrate across the membrane. Cofactor biosynthesis; thiamine diphosphate biosynthesis. The complex is likely composed of an ATP-binding protein (ThiZ), a transmembrane protein (ThiX) and a solute-binding protein (ThiY). Belongs to the binding-protein-dependent transport system permease family.