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Related Experiment Videos

Phosphorylation of glucokinase from rat liver in vitro by protein kinase A with a concomitant decrease of its

P Ekman1, E Nilsson

  • 1Department of Medical and Physiological Chemistry, University of Uppsala, Sweden.

Archives of Biochemistry and Biophysics
|March 1, 1988
PubMed
Summary

Rat liver glucokinase phosphorylation by protein kinase A alters enzyme kinetics. This modification, reversible by alkaline phosphatase, affects glucokinase activity and its serine residues.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Glucokinase plays a crucial role in glucose metabolism.
  • Enzyme regulation through post-translational modifications like phosphorylation is a key area of study.

Purpose of the Study:

  • To investigate the effect of phosphorylation on purified rat liver glucokinase.
  • To identify the site and consequences of glucokinase phosphorylation.

Main Methods:

  • Purification of rat liver glucokinase.
  • Incubation with [32P]-ATP and protein kinase A (PKA).
  • Analysis of phosphorylation site and kinetic parameters (K0.5, Vmax).
  • Dephosphorylation using alkaline phosphatase.

Main Results:

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  • Glucokinase was phosphorylated by PKA, with phosphate bound to serine residues.
  • Phosphorylation increased the K0.5 and decreased the Vmax of glucokinase.
  • The phosphate group was removed by alkaline phosphatase, restoring enzyme activity.
  • Enzymatically inactive glucokinase did not undergo phosphorylation.

Conclusions:

  • Phosphorylation by PKA is a regulatory mechanism for glucokinase activity.
  • Serine residue modification impacts glucokinase's affinity for glucose and catalytic rate.
  • The phosphorylation is reversible, suggesting a dynamic regulatory role.