Folate-binding protein that interacts with the energy-coupling factor (ECF) ABC-transporter complex. Unlike classic ABC transporters this ECF transporter provides the energy necessary to transport a number of different substrates. The substrates themselves are bound by transmembrane, not extracytoplasmic soluble proteins (By similarity). Upon coexpression with EcfA1A2T in E.coli allows 5-formyltetrahydrofolate uptake; uptake requires both FolT and EcfA1A2T. In E.coli forms a stable energy-coupling factor (ECF) transporter complex probably composed of a membrane-embedded substrate-binding protein (S component), two ATP-binding proteins (A components) and a transmembrane protein (T component).