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Disentangling First and Second Sphere Effects in Iron-Sulfur Cubanes.

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Synthetic iron-sulfur clusters reveal that direct covalent interactions fine-tune electronic structure at all temperatures, while indirect interactions are only significant at very low temperatures. This clarifies structure-function relationships in metallo-cofactors.

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Area of Science:

  • Bioinorganic Chemistry
  • Biophysics
  • Structural Biology

Background:

  • Cubane-type iron-sulfur clusters (Fe4S4) are crucial metallo-cofactors mediating electron transfer (ET) in biological systems.
  • Efficient ET relies on intricate cofactor-protein interactions, categorized as first-sphere (covalent) and second-sphere (noncovalent).
  • Second-sphere interactions are poorly understood due to their elusive and entangled nature.

Purpose of the Study:

  • To systematically investigate and differentiate the effects of first-sphere and second-sphere interactions on Fe4S4 cluster properties.
  • To determine the temperature-dependent influence of these interactions on electronic and magnetic structures.
  • To provide insights for identifying elusive second-sphere interactions in biological systems.

Main Methods:

  • Utilized a series of synthetic Fe4S4 complexes to independently study first- and second-sphere interactions.
  • Employed spectroscopic methods to analyze interactions across multiple oxidation states ([Fe4S4]1+, [Fe4S4]2+, and [Fe4S4]3+).
  • Investigated electrostatic and electric dipolar interactions at varying temperatures, including ambient and cryogenic conditions.

Main Results:

  • First-sphere covalent interactions with histidine-type ligands consistently fine-tune the electronic/magnetic structure of Fe4S4 clusters at ambient temperatures.
  • Second-sphere electrostatic interactions show minimal impact on the gross electronic/magnetic structure at biologically relevant temperatures, though effects are observable at very low temperatures.
  • A clear energetic distinction between the influences of first- and second-sphere interactions was established.

Conclusions:

  • First-sphere interactions play a persistent role in modulating Fe4S4 cluster properties across temperatures.
  • Second-sphere interactions have a limited impact on the overall electronic/magnetic structure at physiological temperatures.
  • These findings enhance the biophysical understanding of Fe4S4 cofactor function and aid in identifying critical second-sphere interactions in enzymes.