LIST OF FIGURES Figure pg 1-1. Timeline of developing views of F1Fo ATP synthase............... ...............5 1-2. Space-filling structural model of Escherichia coli F1Fo ATP synthase............._.._. .....7 1-3. Structure of the a subunit of E coli F1Fo ATP synthase............... ...............19 1-4. Controversial models of the a subunit topology ....._.._.. .... ... .__. ........_.......29 1-5. Amino acid sequence of the E. coli F1Fo ATP synthase b subunit............_..._... ..........3 8 1-6. Gross structure of the E. coli F1Fo ATP synthase and the domains of the b subunit ........._..._... ...............40.._.._.. ..... 1-7. Model for F1Fo ATP synthase peripheral stalk orientation dependent upon the direction of rotation during ATP synthesis or hydrolysis ..........._.._ ........._..__....47 1-8. Speculative models for the b-like subunits ........._..._... ........._..._...55......_. . 1-9. Model of proton translocation and torque generation in Fo........ .............. .59 1-10. The binding change mechanism .............. ...............63.... 2-1. Oligonucleotides for epitope tags and mutagenesis of uncF(b) ................ ...............74 2-2. Construction of the single transcript expression system .............. ....................7 2-3. Histidine and HA-epitope-tagged b subunit expression system ............... ..............89 2-4. Western blot analysis s of hi stidine and HA-epitope tagged b subunits .....................92 2-5. Investigation of detergent solubilization of F1Fo ATP synthase complexes .............94 2-6. Ni-resin purification of F 1Fo, expressing different length b subunits, treated with the cross-linker BS3 ........._.__ ..... ._._ ...............95... 2-7. Ni-resin purification of histidine and HA-epitope tagged F1Fo treated with the cross-linker BS3 ................ ...............96........... .... 2-8. Histidine and V5-epitope-tagged b subunit expression system ........._...... ..............98