Predicted to enable proton transmembrane transporter activity. Predicted to contribute to ATP hydrolysis activity and proton-transporting ATP synthase activity, rotational mechanism. Predicted to be involved in mitochondrial ATP synthesis coupled proton transport and mitochondrial proton-transporting ATP synthase complex assembly. Predicted to act upstream of or within proton transmembrane transport. Located in mitochondrial inner membrane. Is expressed in several structures, including alimentary system; eye; genitourinary system; integumental system; and nervous system. Human ortholog(s) of this gene implicated in mitochondrial complex V (ATP synthase) deficiency. Orthologous to human ATP5F1D (ATP synthase F1 subunit delta). [provided by Alliance of Genome Resources, Apr 2022]