Predicted to contribute to proton-transporting ATP synthase activity, rotational mechanism. Predicted to be involved in proton motive force-driven mitochondrial ATP synthesis. Located in mitochondrion. Human ortholog(s) of this gene implicated in mitochondrial complex V (ATP synthase) deficiency nuclear type 3. Is an ortholog of human ATP5F1E (ATP synthase F1 subunit epsilon) and ATP5F1EP2 (ATP synthase F1 subunit epsilon pseudogene 2).