Predicted to contribute to proton-transporting ATP synthase activity, rotational mechanism. Predicted to be involved in proton motive force-driven ATP synthesis. Predicted to act upstream of or within monoatomic ion transport. Predicted to be located in mitochondrial inner membrane. Predicted to be part of proton-transporting ATP synthase complex. Is expressed in several structures, including adaxial cell; alar plate midbrain region; digestive system; optic tectum; and retina. Human ortholog(s) of this gene implicated in mitochondrial complex V (ATP synthase) deficiency nuclear type 5. Orthologous to human ATP5F1D (ATP synthase F1 subunit delta).