Part of the ABC transporter complex TauABC involved in taurine import. Responsible for energy coupling to the transport system. ATP + H2O + taurine(out) = ADP + H(+) + phosphate + taurine(in) The complex is composed of two ATP-binding proteins (TauB), two transmembrane proteins (TauC) and a solute-binding protein (TauA). Regulated by CysB in response to sulfate starvation. Belongs to the ABC transporter superfamily. Taurine importer (TC 3.A.1.17.1) family.