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Molecular effects of cancer-associated somatic mutations on the structural and target recognition properties of Keap1

Halema Khan1, Ryan C Killoran1, Anne Brickenden1

  • 1*Department of Biochemistry, The University of Western Ontario, London, Ontario, Canada, N6A 5C1.

The Biochemical Journal
|January 14, 2015
PubMed

Insights

Kelch-like ECH-associated protein 1 (Keap1) mutations impact its ability to repress nuclear factor erythroid 2-related factor 2 (Nrf2). These structural changes in Keap1 may contribute to cancer development by altering oxidative stress responses.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Keap1 regulates the Nrf2-dependent oxidative stress response pathway.
  • Keap1 acts as a repressor of Nrf2, a transcription factor crucial for cytoprotective enzyme expression.
  • Keap1 mutations are linked to aberrant activation of the antioxidant pathway and various cancers.

Purpose of the Study:

  • To investigate the molecular effects of specific Keap1 mutations on its structure and function.
  • To understand the mechanistic links between Keap1 mutations and cancer pathogenesis.
  • To elucidate how somatic mutations affect Keap1's role as an Nrf2 repressor.

Main Methods:

  • Nuclear magnetic resonance (NMR) spectroscopy.
  • Circular dichroism (CD) spectroscopy.
  • Isothermal titration calorimetry (ITC).

Main Results:

  • Investigated mutations: G333C, G350S, G364C, G379D, R413L, R415G, A427V, G430C, and G476R.
  • Mutations showed differential effects on Keap1 protein stability and target binding, depending on their location.
  • Results provide insight into the molecular impact of somatic mutations on Keap1's Nrf2 repressor function.

Conclusions:

  • Specific Keap1 mutations alter protein stability and Nrf2 binding affinity.
  • These alterations provide mechanistic insights into Keap1's role in cancer development.
  • Understanding these molecular changes is crucial for cancer research and therapeutic strategies.

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