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Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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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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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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Ladder Diagrams: Complexation Equilibria01:07

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Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Oxidative pathways of apo, partially, and fully Zn(II)- and Cd(II)-metalated human metallothionein-3 are dominated by disulfide bond formation.

The FEBS journal·2024
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ESI-MS analysis of Cu(I) binding to apo and Zn7 human metallothionein 1A, 2, and 3 identifies the formation of a similar series of metallated species with no individual isoform optimization for Cu(I).

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Updated: Jul 16, 2025

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Cu(I) binds to Zn7-MT2 via two parallel pathways.

Adyn Melenbacher1, Martin J Stillman1

  • 1Department of Chemistry, The University of Western Ontario, London, Ontario, Canada.

Metallomics : Integrated Biometal Science
|September 12, 2023
PubMed
Summary

Metallothionein-2 (MT2) protein binds copper and zinc ions through two distinct pathways, influencing metal homeostasis and detoxification. This study reveals specific Cu:Zn ratios and binding domains within MT2, crucial for understanding its role in disease.

Keywords:
Cu(I)-thiolate clustersESI-MSmetal homeostasismetallothioneinphosphorescence spectroscopysimulations

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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Area of Science:

  • Biochemistry
  • Proteomics
  • Spectroscopy

Background:

  • Metallothionein proteins (MTs) are vital for maintaining copper (Cu) and zinc (Zn) homeostasis and detoxifying heavy metals.
  • MT2's diverse expression and disease correlations (cancers, neurological, respiratory) highlight the importance of understanding its metallation properties.
  • Isotopically pure 63Cu(I) and 68Zn(II) are crucial for resolving mass spectral complexities in Cu, Zn-MT2 studies.

Purpose of the Study:

  • To precisely determine Cu(I) and Zn(II) stoichiometries bound to MT2 at physiological pH.
  • To elucidate the parallel pathways of Cu(I) metallation in Zn7-MT2.
  • To establish formation constants (KF) for various Cu, Zn-MT2 species and assign spectral bands.

Main Methods:

  • Electrospray ionization (ESI)-mass spectrometry was used to analyze Cu, Zn-MT2 complexes.
  • Mass spectral simulations were employed to determine exact Cu:Zn ratios during titration.
  • Room temperature phosphorescence and circular dichroism (CD) spectroscopy provided parallel data for species assignment.

Main Results:

  • Two parallel pathways of Cu(I) metallation for Zn7-MT2 were identified, yielding specific Cu:Zn ratios.
  • Pathway ① produced Cu5Zn5-MT2 and Cu9Zn3-MT2; Pathway ② yielded major products Cu6Zn4-MT2 and Cu10Zn2-MT2.
  • CD spectral analysis suggests Cu(I) initially binds to the β domain, forming Cu5Zn1 or Cu6 clusters, leaving the α domain with Zn4.

Conclusions:

  • The study precisely quantifies Cu(I) and Zn(II) binding stoichiometries to MT2 using isotopically pure metals and mass spectrometry.
  • Metallation occurs via two distinct pathways, leading to defined Cu, Zn-MT2 species.
  • Cu(I) preferentially binds to the β domain of MT2, influencing the overall protein structure and function.