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Coupling of proteolysis to ATP hydrolysis uponEscherichia coli lon protease functioning: I. kinetic aspects of ATP hydrolysis

Abstract

Some aspects of theEscherichia coli Lon protease ATPase function were studied around the optimum pH value. It was revealed that in the absence of the protein substrate the maximum ATPase activity of the enzyme is observed at an equimolar ratio of ATP and Mg2+ ions in the area of their millimolar concentrations. Free components of the substrate complex (ATP-Mg)2− inhibit the enzyme ATPase activity. It is hypothesized that the effector activity of free Mg2+ ions is caused by the formation of the “ADP-Mg-form” of ATPase centers. It was shown that the activation of ATP hydrolysis in the presence of the protein substrate is accompanied by an increase in the affinity of the (ATP-Mg)2− complex to the enzyme, by an elimination of the inhibiting action of free Mg2+ ions without altering the efficiency of catalysis of ATP hydrolysis (based on thek cat value), and by a change in the type of inhibition of ATP hydrolysis by the (ADP-Mg) complex (without changing theK i value). Interaction of the Lon protease protein substrate with the enzyme area located outside the peptide hydrolase center was demonstrated by a direct experiment.

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Correspondence to T. V. Rotanova.

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Melnikov, E.E., Tsirulnikov, K.B. & Rotanova, T.V. Coupling of proteolysis to ATP hydrolysis uponEscherichia coli lon protease functioning: I. kinetic aspects of ATP hydrolysis. Russ J Bioorg Chem 26, 474–481 (2000). https://doi.org/10.1007/BF02758618

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  • DOI: https://doi.org/10.1007/BF02758618

Key words

  • ATPase
  • ATP-dependent proteolysis
  • lon gene
  • E. coli
  • Lon protease