HIGH-RESOLUTION STRUCTURE OF THE ROTOR RING FROM A PROTON DEPENDENT ATP SYNTHASE HYDROLASE, F1FO ATP SYNTHASE ROTOR, ION PROTON-TRANSLOCATION, ION TRANSPORT, TRANSMEMBRANE, C-RING STRUCTURE, SPIRULINA PLATENSIS, HYDROGEN ION TRANSPORT, MEMBRANE PROTEIN COMPLEX, CF(0), MEMBRANE, LIPID-BINDING 2WIE