ATPase of Escherichia coli: purification, dissociation, and reconstitution of the active complex from the isolated subunits

Biochemistry
G Vogel, R Steinhart

Abstract

A simple procedure for the purification of Mg2+-stimulated ATPase of Escherichia coli by fractionation with poly(ethylene glycols) and gel filtration is described. The enzyme restores ATPase-linked reactions to membrane preparations lacking these activities. Five different polypeptides (alpha, beta, gamma, delta, epsilon) are observed in sodium dodecyl sulfate electrophoresis. Freezing in salt solutions splits the enzyme complex into subunits which do not possess any catalytic activity. The presence of different subunits is confirmed by electrophoretic and immunological methods. The active enzyme complex can be reconstituted by decreasing the ionic strength in the dissociated sample. Temperature, pH, protein concentration, and the presence of substrate are each important determinants of the rate and extent of reconstitution. The dissociated enzyme has been separated by ion-exchange chromatography into two major fragments. Fragment IA has a molecular weight of about 100000 and contains the alpha, gamma, and epsilon polypeptides. The minor fragment, IB, has about the same molecular weight but contains, besides alpha, gamma, and epsilon, the delta polypeptide. Fragment II, with a molecular weight of about 52000, appears to be iden...Continue Reading

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