Mitochondrial transporter mediating uptake of thiamine pyrophosphate (ThPP) into mitochondria. The transmembrane helices are not perpendicular to the plane of the membrane, but cross the membrane at an angle. Odd-numbered transmembrane helices exhibit a sharp kink, due to the presence of a conserved proline residue (By similarity). Belongs to the mitochondrial carrier (TC 2.A.29) family.