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How First Shell-Second Shell Interactions and Metal Substitution Modulate Protein Function.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Metalloprotein Chemistry

Background:

  • Hydrogen bonds are critical for metalloprotein function, influencing metal complex stability, binding affinity, and enzyme activity.
  • Limited understanding exists regarding the specific hydrogen-bonding partners of metal ligands in diverse metalloproteins.
  • Zinc-fingers are crucial protein motifs involved in various cellular processes, susceptible to disruption by heavy metals like cadmium.

Purpose of the Study:

  • To determine the preferred hydrogen-bonding partners of cysteine ligands bound to zinc (Zn2+) or cadmium (Cd2+) in zinc-fingers.
  • To identify the key factors governing these hydrogen-bonding preferences.
  • To elucidate the impact of secondary hydrogen-bonding interactions on Zn2+→Cd2+ substitution and subsequent protein function.

Main Methods:

  • Utilized well-calibrated computational methods to analyze hydrogen-bonding interactions.
  • Investigated zinc-fingers with varying net charge and solvent accessibility.
  • Focused on cysteine (Cys-) ligands coordinating Zn2+ and Cd2+.

Main Results:

  • Identified specific preferred hydrogen-bonding partners for metal-bound thiolates in different zinc-finger environments.
  • Demonstrated that secondary hydrogen-bonding interactions significantly influence the substitution of Zn2+ by Cd2+.
  • Highlighted the role of net charge and solvent accessibility in modulating these interactions and metal preference.

Conclusions:

  • Secondary hydrogen bonds play a crucial role in determining the susceptibility of zinc-fingers to cadmium-induced structural changes.
  • Understanding these interactions is vital for predicting protein inactivation and its consequences on cellular processes like DNA repair and cell cycle control.
  • This knowledge aids in assessing the potential toxicity of cadmium and its impact on biological systems.