Probable pantothenate-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 and transport it into cells. Upon coexpression with its energy-coupling factor (ECF) ABC-transporter complex EcfA1A2T in E.coli allows pantothenate uptake; uptake requires both PanT 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).