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  • Title: The ATP synthetase of Escherichia coli K12: purification of the enzyme and reconstitution of energy-transducing activities.
    Author: Friedl P, Friedl C, Schairer HU.
    Journal: Eur J Biochem; 1979 Oct; 100(1):175-80. PubMed ID: 226359.
    Abstract:
    The ATP synthetase of Escherichia coli K12 was purified by a simple procedure. The dicyclohexylcarbodiimide-sensitive ATPase activity was enriched 21-fold. The ATP synthetase preparation contained the eight polypeptides (alpha, beta, gamma, a,delta, b,espilon, c) of the enzyme and a residual contamination (4% of the total protein) as shown by dodecylsulfate/polyacrylamide electrophoresis. The polypeptide c was specifically labelled with [14C]dicyclohexylcarbodiimide. Energy-transducing activities were reconstituted from soybean phospholipids and the purified enzyme. The proteoliposomes exhibited a significantly higher ATP-32Pi exchange activity and a higher proton-translocating activity as compared to the untreated membranes.
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