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Ligand Binding Sites

Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Enols are a class of compounds where a hydroxyl group is attached to a carbon–carbon double bond, which implies that it is a vinyl alcohol. A carbonyl compound with an α hydrogen undergoes keto–enol tautomerism and remains in equilibrium with its tautomer, the enol form. Usually, the keto tautomer is present in a higher concentration than the enol tautomer due to the higher bond energy of C=O compared to C=C. Moreover, the direction of the keto–enol equilibrium is governed by factors like...
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Noncovalent Attractions in Biomolecules02:35

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Hydrolysis

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Re(CO)(3)(H(2)O)(3)(+) binding to lysozyme: structure and reactivity.

Sarah L Binkley1, Thomas C Leeper, Roger S Rowlett

  • 1Department of Chemistry, University of Akron, Akron, OH 44325-3601, USA.

Metallomics : Integrated Biometal Science
|August 2, 2011
PubMed
Summary

Rhenium tricarbonyl cations form a single adduct with hen egg white lysozyme by binding to His15. This interaction, confirmed by NMR and X-ray diffraction, minimally impacts the protein's overall structure.

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Area of Science:

  • Bioinorganic Chemistry
  • Protein-Ligand Interactions
  • Structural Biology

Background:

  • Rhenium complexes are explored for potential therapeutic applications.
  • Understanding metal-protein interactions is crucial for designing metallodrugs.
  • Lysozyme serves as a model protein for studying protein modification.

Purpose of the Study:

  • To investigate the covalent binding of a rhenium tricarbonyl cation to hen egg white lysozyme.
  • To characterize the binding site and the structural consequences of adduct formation.
  • To assess the stability and nature of the rhenium-protein complex.

Main Methods:

  • Reaction of [Re(CO)3(H2O)3]+ with hen egg white lysozyme in aqueous solution.
  • Nuclear Magnetic Resonance (NMR) spectroscopy for structural analysis.
  • Single crystal X-ray diffraction for detailed structural determination.

Main Results:

  • A single covalent adduct was formed between the rhenium tricarbonyl cation and lysozyme.
  • The rhenium cation binds specifically to Histidine 15 (His15) of the protein.
  • The binding occurs through the displacement of a water ligand from the rhenium complex.
  • The overall three-dimensional structure of the lysozyme protein remains largely unaffected.

Conclusions:

  • The rhenium tricarbonyl cation selectively binds to His15 in hen egg white lysozyme.
  • The formation of the covalent adduct does not induce significant structural perturbations in the protein.
  • This study provides insights into the bioinorganic chemistry of rhenium-protein interactions.