... whether the c subunit stoichiometry is variable,and, if so, whether a variation of the c1⁄ c2 ⁄ 3ratio maychange the function of the enzyme from an ATP syn-thase to an ATPase [23].These ... compet-ent in ATP synthesis, despite its unusual and uniquemembrane-embedded motor. This is the starting pointfor a detailed analysis of the stucture and function of the rotor of the Na+F1F0-ATP ... subunit b, the 35 kDafragment to subunit c, the 19 kDa fragment to subunitd, the 18 kDa fragment to a mixture of subunits a andb, the 16 kDa fragment to subunit e, the 14 kDa frag-ment to subunit...