ß‐Subunit of Escherichia coli F1‐ATPase

Abstract
A mutant strain KF87 of E. coli with a defective ß‐subunit (Ala‐151 → Val) of F1‐ATPase was isolated. The mutation is within the conserved sequence (G‐X‐X‐X‐X‐G‐K‐T/S) of nucleotide‐binding proteins. The mutant F1‐ATPase had a much higher rate of uni‐site hydrolysis of ATP than the wild type, and about 6% of the wild‐type multi‐site activity. The mutant enzyme showed defective transmission of conformational change(s) between the ligand‐ and aurovertin‐binding sites.