Predicted to contribute to proton-transporting ATP synthase activity, rotational mechanism. Predicted to be involved in proton motive force-driven ATP synthesis. Located in mitochondrion. Is expressed in several structures, including adult head; adult heart; antennal primordium; embryonic/larval midgut primordium; and head epidermis primordium. Used to study mitochondrial complex V (ATP synthase) deficiency nuclear type 5. 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).