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Metal-Ligand Bonds

Metal-Ligand Bonds

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...

Ligand Binding Sites

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.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

Ligand Binding Sites

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.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...

The Equilibrium Binding Constant and Binding Strength

The Equilibrium Binding Constant and Binding Strength

The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:

Ligand Binding and Linkage

Ligand Binding and Linkage

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 the...

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

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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Related Experiment Video

Updated: Jun 17, 2026

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

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

Published on: December 16, 2013

Cu(I) binding properties of a designed metalloprotein.

Fei Xie¹, Duncan E K Sutherland, Martin J Stillman

¹Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, OH 43403, USA.

Journal of Inorganic Biochemistry

|January 12, 2010

Summary

This study investigates copper(I) binding to a designed peptide, C16C19-GGY. It reveals cooperative formation of a tetranuclear copper cluster and a secondary lower-affinity binding site, impacting peptide emission.

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

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Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores

Quantifying the Binding Interactions Between Cu(II) and Peptide Residues in the Presence and Absence of Chromophores

Published on: April 5, 2022

Area of Science:

Biochemistry
Bioinorganic Chemistry
Peptide Design

Background:

Designed peptide C16C19-GGY aims for alpha-helical coiled-coil formation.
Incorporates a Cys-X-X-Cys motif for metal binding on its hydrophobic face.

Purpose of the Study:

To characterize the copper(I) binding properties of the designed peptide C16C19-GGY.
To elucidate the structural and functional consequences of copper(I) coordination.

Main Methods:

Absorption and emission spectroscopy
Electrospray ionization mass spectrometry (ESI-MS)
Circular dichroism (CD) spectroscopy
Spectroscopic titrations

Main Results:

A 1:1 copper(I)-peptide complex forms initially, existing as a tetramer with a tetranuclear copper cluster.
ESI-MS and UV data confirm cooperative formation of the tetranuclear copper cluster.
A second, lower affinity copper(I) binding site is occupied upon further addition, quenching 600nm emission without altering peptide conformation.
Tris(2-carboxyethyl)phosphine (TCEP) competitively inhibits binding to the low affinity site but not the clusters.

Conclusions:

The peptide C16C19-GGY facilitates cooperative formation of a tetranuclear copper(I) cluster.
A secondary copper(I) binding site influences peptide emission properties.
The peptide's conformational stability is maintained across different copper(I) binding states.