ATP5H (ATP synthase, H+ transporting, mitochondrial Fo complex, subunit delta), also known as ATPQ, is a 161 amino acid protein that belongs to the ATPase delta subunit family. F-type ATPases, such as ATP5H, consist of two linked components: CF1, a soluble catalytic core that consists of five different subunits (alpha, beta, gamma , delta and E), and CF0, a membrane proton channel that contains nine subunits (alpha, beta, ?, delta, E, ?, gamma , F6 and 8). ATP5H encodes the delta subunit of the F0 complex. ATP5H produces ATP from ADP in the presence of a proton gradient across the membrane, which is generated by electron transport complexes of the respiratory chain. Localizing to mitochondrial inner membrane,