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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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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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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

926
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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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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Metal ions in biomedically relevant macromolecular structures.

Karolina A Majorek1, Michal Gucwa1,2,3, Krzysztof Murzyn2

  • 1Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA, United States.

Frontiers in Chemistry
|September 9, 2024
PubMed
Summary

Structural biology methods provide crucial insights into metal ion functions in biological systems and disease. This study examines the accuracy of modeling metal ion binding sites in protein structures, highlighting potential interpretation errors.

Keywords:
biomedical researchdrug discoverymetal-protein complexesmetalloproteinsreproducibilitystructural biology

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Area of Science:

  • Structural biology
  • Biochemistry
  • Metalloprotein research

Background:

  • Metal ions are essential for numerous biological processes, and understanding their roles is vital for disease research and therapeutic development.
  • Structural methods like X-ray crystallography, cryo-electron microscopy, and NMR spectroscopy offer atomic-level details of metal-protein interactions.
  • These experimental techniques have limitations that can lead to misinterpretations of metal ion binding sites.

Purpose of the Study:

  • To evaluate the quality of metal ion binding site modeling in protein structures determined by various methods.
  • To identify common sources of errors in structural data related to metal ions.
  • To assess the impact of these errors on the interpretation of metal-protein interactions and conclusions drawn from structural studies.

Main Methods:

  • Analysis of structural data from X-ray crystallography, cryo-electron microscopy, and nuclear magnetic resonance.
  • Examination of metal ion binding site models within protein structures.
  • Comparative assessment of modeling accuracy across different structure determination techniques.

Main Results:

  • Variations in the quality of metal ion binding site modeling exist across different structure determination methods.
  • Specific types of errors are prevalent in the modeling of metal-protein complexes.
  • These modeling inaccuracies can significantly affect the conclusions drawn about metal ion roles in biological systems.

Conclusions:

  • Critical evaluation of structural data quality is necessary for accurate interpretation of metal ion binding sites in proteins.
  • Awareness of potential errors in structural models is crucial for researchers in biochemistry and structural biology.
  • Improved modeling practices are needed to enhance the reliability of structural information concerning metalloproteins.