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Michele Invernici1,2, Giulia Selvolini3, José Malanho Silva1,3

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This summary is machine-generated.

Different iron-sulfide-glutathione ratios influence iron-sulfur cluster speciation in mitochondria. The study reveals two distinct complexes, [Fe2Fe2S4(GS)4]2− and [FeFeS2(GS)4]3−, impacting cellular iron homeostasis.

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Area of Science:

  • Biochemistry
  • Mitochondrial Biology
  • Inorganic Chemistry

Background:

  • Iron-sulfur clusters are crucial for cellular processes.
  • Mitochondrial iron metabolism is vital for cellular function and homeostasis.
  • Glutathione plays a role in cellular redox balance and metal ion binding.

Purpose of the Study:

  • To investigate the speciation of iron-sulfur cluster glutathione complexes under varying iron-sulfide-glutathione ratios.
  • To understand the formation of specific iron-sulfur complexes in conditions mimicking the mitochondrial matrix.
  • To explore the potential role of these complexes in regulating the mitochondrial labile iron pool.

Main Methods:

  • In vitro experiments were conducted to simulate mitochondrial matrix conditions.
  • Varying ratios of iron, sulfide, and glutathione were applied.
  • Spectroscopic or other relevant analytical techniques were used to characterize the formed complexes (details not provided in abstract).

Main Results:

  • An excess of sulfide relative to iron ions resulted in the formation of a tetranuclear complex: [FeII2FeIII2S4(GS)4]2−.
  • An excess of iron ions favored the formation of a dinuclear complex: [FeIIFeIII S2(GS)4]3−.
  • An interconversion equilibrium was observed between these two complexes.

Conclusions:

  • The speciation of iron-sulfur cluster glutathione complexes is highly dependent on the relative concentrations of iron, sulfide, and glutathione.
  • The dinuclear complex [FeIIFeIII S2(GS)4]3− may contribute to the mitochondrial labile iron pool.
  • These findings suggest a potential mechanism for regulating cellular iron homeostasis at the mitochondrial level.