Chelation

Summary

Chelation is a type of bonding of ions and molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central metal atom. These ligands are called chelants, chelators, chelating agents, or sequestering agents. They are usually organic compounds, but this is not a necessity, as in the case of zinc and its use as a maintenance therapy to prevent the absorption of copper in people with Wilson's disease. Chelation is useful in applications such as providing nutritional supplements, in chelation therapy to remove toxic metals from the body, as contrast agents in MRI scanning, in manufacturing using homogeneous catalysts, in chemical water treatment to assist in the removal of metals, and in fertilizers. Chelate effect The chelate effect is the greater affinity of chelating ligands for a metal ion than that of similar nonchelating (monodentate) ligands for the same meta

Official source

https://en.wikipedia.org/wiki/Chelation

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Determine the effect of chelating agents on apparent groth and specific recombinant-protein production rates of a CHO cell-line cultivated in serum-free cell culture media - propose an alternative to the use of Aurintricarboxylic Acid

EPFL2002

Metal ion trace detection by a chelator-modified gold electrode: A comparison of surface to bulk affinity

Rudolf Hovius, Thierry Stora, Horst Vogel

The binding of metal ions to self-assembled nitrilotriacetic acid (NTA)-modified thioalkane monolayers was monitored by impedance spectroscopy via a capacitance change of the blocking gold electrode. Binding to a fluorescent NTA-derivative and the native NTA, measured in bulk by fluorescence quenching and isothermal titration calorimetry, was determined for comparison. Surface and bulk absolute dissociation constants K-abs of metal ion-NTA complexes for these three derivatives showed no significant differences. Cu2+ concentrations as low as 0.5 nM (30 ppt) could be detected by impedance spectroscopy. This concept of metal ion trace detection might be further extended to other chelating groups for use in future applications.

American Chemical Society1997

Engineered peptide macrocycles can inhibit matrix metalloproteinases with high selectivity

Alice Baumann, Christian Heinis, Xudong Kong, Michal Sabisz, Jeremy Touati, Jonas Alfred Karl Wilbs

Matrix metalloproteinases (MMPs) are zinc‐dependent endopeptidases at the intersection of health and disease due to their involvement in processes such as tissue repair and immunity as well as cancer and inflammation. Because of the high structural conservation in the catalytic domains and shallow substrate binding sites, selective, small‐molecule inhibitors of MMPs have remained elusive. In a tour‐de‐force peptide engineering approach combining phage‐display selections, rational design of enhanced zinc chelation, and d‐amino acid screening, we succeeded in developing a first synthetic MMP‐2 inhibitor that combines high potency (Ki=1.9±0.5 nm), high target selectivity, and proteolytic stability, and thus fulfills all the required qualities for in cell culture and in vivo application. Our work suggests that selective MMP inhibition is achievable with peptide macrocycles and paves the way for developing specific inhibitors for application as chemical probes and potentially therapeutics.

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