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Metal-Ligand Bonds02:51

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Crystal Field Theory
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CFT focuses on...
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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Updated: Apr 25, 2026

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
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Modeling Zn²⁺ release from metallothionein.

C Satheesan Babu1, Yu-Ming Lee, Todor Dudev

  • 1Institute of Biomedical Sciences, Academia Sinica , Taipei 115, Taiwan , R.O.C.

The Journal of Physical Chemistry. A
|August 14, 2014
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Summary

Understanding how metallothioneins (MTs) release zinc (Zn2+) is key for disease research. This study developed a computational method to calculate Zn2+ release free energies, revealing the protein matrix

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Area of Science:

  • Biochemistry
  • Computational Biology
  • Biophysics

Background:

  • Mammalian metallothioneins (MTs) are crucial for zinc (Zn2+) homeostasis, storing and donating Zn2+ to metalloproteins.
  • MTs are implicated in various diseases, making their Zn2+ release mechanisms a significant research area.

Purpose of the Study:

  • To develop and validate a computational strategy for calculating the free energy of Zn2+ release from MTs.
  • To investigate the differential Zn2+ release propensities of MT domains and the role of the protein matrix.

Main Methods:

  • Combined classical molecular dynamics (MD) simulations, quantum-mechanics/molecular-mechanics (QM/MM) minimizations, and continuum dielectric calculations.
  • Calculated free energies for Zn2+ release from MTs in the presence and absence of the protein matrix.

Main Results:

  • The computational method accurately reproduced experimental findings on differential Zn2+ binding affinities and domain-specific release rates.
  • The study quantified the free energies of Zn2+ release, highlighting the influence of the protein matrix, dynamics, and conformational changes.
  • The β domain showed lower thermodynamic stability and faster Zn2+ release with oxidizing agents compared to the α domain.

Conclusions:

  • The protein matrix, protein dynamics, and coupled conformational changes are critical factors influencing the differential Zn2+ release from MT domains.
  • The developed computational approach provides a valuable tool for studying Zn2+ dynamics in MTs and related biological processes.