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The H

Cécile Mons1, Thomas Botzanowski2, Anton Nikolaev3

  • 1Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Univ Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette cedex, France.

Biochemistry
|September 12, 2018
PubMed
Summary
This summary is machine-generated.

Human mitoNEET (mNT) protein transfers iron-sulfur clusters to repair damaged proteins. Its activity is regulated by redox state and cytosolic pH, crucial for cellular homeostasis.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Mitochondrial Protein Research

Background:

  • Human mitoNEET (mNT) is an outer mitochondrial membrane protein.
  • mNT participates in a cytosolic pathway for repairing oxidatively damaged proteins via iron-sulfur (Fe-S) cluster transfer.

Purpose of the Study:

  • To investigate the regulatory mechanisms of mNT's Fe-S cluster transfer activity.
  • To understand the role of redox state and pH in mNT function.

Main Methods:

  • In vitro studies using apo-ferredoxin (FDX) as a cluster recipient.
  • Biophysical and biochemical approaches to assess cluster transfer, O2 sensitivity, and dimer stability.
  • Comparison of mNT's H2O2 resistance with other Fe-S cluster transfer proteins (ISCU, SufB).

Main Results:

  • mNT utilizes an Fe-based redox switch for regulated Fe-S cluster transfer.
  • Cluster transfer is direct to FDX, with only one cluster transferred under specific conditions.
  • Cytosolic pH significantly modulates mNT's cluster transfer ability and sensitivity to oxygen.
  • mNT exhibits high resistance to H2O2, unlike ISCU and SufB.

Conclusions:

  • mNT's Fe-S cluster transfer is regulated by both its redox state and cytosolic pH.
  • Dysregulation of cellular pH homeostasis in diseases like cancer may impair mNT function.
  • This pH-dependent regulation is critical for maintaining cellular pathways controlled by mNT.