Choline/H+ antiporter, mainly in mitochodria ( , ). Also acts as a low-affinity ethanolamine/H+ antiporter, regulating the supply of extracellular ethanolamine (Etn) for the CDP-Etn pathway, redistribute intracellular Etn and balance the CDP-Cho and CDP-Etn arms of the Kennedy pathway .
Does not exhibit choline transporter activity.
Subcellular locations: Cell membrane, Mitochondrion outer membrane
Mainly expressed in mitochondria.
Present in supporting cells of the inner ear (at protein level).
Expressed in inner ear vestibular tissue.