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Engineering Oncogenic Heterozygous Gain-of-Function Mutations in Human Hematopoietic Stem and Progenitor Cells
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Kinetic network model to explain gain-of-function mutations in ERK2 enzyme.

Mikita Misiura1, Anatoly B Kolomeisky1

  • 1Department of Chemistry, Rice University, Houston, Texas 77005-1892, USA.

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|April 22, 2019
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Summary
This summary is machine-generated.

A "sevenmaker" mutation in ERK2 protein kinase enhances its activity by altering enzyme-substrate interactions. This study models how weakened interactions can paradoxically boost catalytic efficiency, explaining disease-linked pathway overactivation.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Systems Biology
  • Enzyme Kinetics

Background:

  • The Ras/Raf/MEK/ERK signaling pathway is crucial for cellular responses but its dysregulation, often due to mutations, drives diseases like cancer.
  • The ERK2 (Extracellular signal-regulated kinase 2) protein is a key component of this pathway, and specific mutations can lead to its hyperactivation.
  • A known "gain-of-function" mutation in ERK2, the "sevenmaker" mutation (D319N), increases its activity in vivo, but the underlying molecular mechanism remains unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism behind the increased activity of the ERK2 "sevenmaker" mutant.
  • To develop a theoretical model explaining how a mutation can paradoxically enhance enzyme activity despite disrupting interactions.
  • To investigate the relationship between enzyme-substrate interaction energy and catalytic efficiency in ERK2.

Main Methods:

  • Development of a semiquantitative kinetic network model for ERK2, treating it as a system of coupled Michaelis-Menten processes.
  • Utilized the method of first-passage processes to calculate the dynamic properties of the ERK2 biochemical network.
  • Analyzed the impact of altered interaction energy between ERK2 and its substrates on kinetic properties.

Main Results:

  • The study presents a model where the "sevenmaker" mutation's effect is linked to changes in enzyme-substrate interaction energy.
  • Demonstrated a nonmonotonic dependence of ERK2 kinetic properties on interaction energy, suggesting that weakened interactions can sometimes enhance catalytic efficiency.
  • Theoretical predictions from the model align with experimental observations of the "sevenmaker" mutation's effect on ERK2 activity.

Conclusions:

  • The increased activity of the ERK2 "sevenmaker" mutant can be explained by changes in enzyme-substrate interaction energy, leading to enhanced catalytic properties.
  • This work highlights that mutations weakening intermolecular interactions may paradoxically improve enzyme function.
  • The study suggests that substrate concentrations might also influence the effect of mutations on enzyme activity.