CATALYTIC CORE SUBUNITS (I AND II) OF CYTOCHROME C OXIDASE FROM RHODOBACTER SPHAEROIDES IN THE REDUCED STATE 3FYE OXIDOREDUCTASE, CONFORMATIONAL CHANGES, CELL MEMBRANE, COPPER, ELECTRON TRANSPORT, HEME, HYDROGEN ION TRANSPORT, ION TRANSPORT, IRON, MEMBRANE, METAL-BINDING, RESPIRATORY CHAIN, TRANSMEMBRANE, TRANSPORT