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The role of αPhe-291 residue in phosphate binding by Escherichia coli F 1 F 0 -ATP synthase was examined. X-ray structures of bovine mitochondrial enzyme suggest that this residue resides in close proximity to the conserved βR246 residue. Herein, we show that mutations αF291D and αF291E in E. coli reduce the ATPase activity of F 1 F 0 membranes by 350-fold. Yet, significant...