Part of the ABC transporter complex HmuTUV involved in hemin import. Responsible for energy coupling to the transport system. The complex is composed of two ATP-binding proteins (HmuV), two transmembrane proteins (HmuU) and a solute-binding protein (HmuT). Belongs to the ABC transporter superfamily. Heme (hemin) importer (TC 3.A.1.14.5) family.