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Chemical and enzymatic characterization of recombinant rabbit muscle pyruvate kinase

  • Christian Boehme , Frank Bieber , Julia Linnemann , Reinhard Breitling , Stefan Lorkowski and Siegmund Reissmann EMAIL logo
Published/Copyright: January 16, 2013

Abstract

The stepwise synthesis of thymidine triphosphate (TTP) requires a kinase for phosphorylation in the last step. Because pyruvate kinase (PK) using phosphoenolpyruvate (PEP) as substrate can regenerate adenosine triphosphate and phosphorylate thymidine diphosphate as well, we chose this enzyme for the synthesis of TTP via an enzymatic cascade reaction. The metalloenzyme PK shows pronounced promiscuity and therefore fits well to the conditions of this reaction. PK commonly used today is isolated from rabbit muscle. We cloned and expressed the respective open reading frame in Escherichia coli, purified, and characterized the His-tagged recombinant enzyme. The enzyme has an activity optimum at 37°C and in the pH range from 7.4 to 7.8. Km constants conformed well with the isolated native enzyme for adenosine diphosphate (ADP) to 0.37±0.02 mm and for PEP to 0.07±0.01 mm. The recombinant enzyme shows the following range in its substrate specificity: ADP>dADP>dGDP>dCDP>thymidine diphosphate (TDP). It allows the phosphorylation of TDP to TTP in high yield (up to 95%). The metal ions Mg2+ and K+ are necessary for full enzymatic activity. The addition of transition metal ions such as Mn2+, Cu2+, Co2+, and Ni2+ reduces activity. Storage of the enzyme at -20°C retains full activity.


Corresponding author: Siegmund Reissmann, Faculty of Biology and Pharmacy, Friedrich Schiller University Jena, Institute of Biochemistry and Biophysics, Dornburger Str. 25, D-07743 Jena, Germany

Received: 2012-7-12
Accepted: 2012-12-18
Published Online: 2013-01-16
Published in Print: 2013-05-01

©2013 by Walter de Gruyter Berlin Boston

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