Four new ligands and four new copper (II) coordination compounds were prepared and characterized by chemical, elemental analysis, cytotoxicity, and FTIR spectroscopy (Fourier transform infrared spectroscopy). The nature of metal-ligand coordination was investigated. The thermal properties of complexes in the solid state were studied using TG-MS techniques (thermogravimetric analysis coupled with mass spectrometry) under dynamic flowing air atmosphere to analyze the principal volatile thermal decomposition and fragmentation products that evolved during thermolysis. The intermediate and final solid thermolysis products were also determined. The MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide) assay was used to evaluate active metabolic cells as an IC (half maximal inhibitory concentration). The relationship between antitumor activity and the position of nitrogen atoms in the organic ligand has been shown.
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http://dx.doi.org/10.3390/ma14112958 | DOI Listing |
Acc Chem Res
January 2025
Department of Chemistry, Washington University, St. Louis, Missouri 63130, United States.
ConspectusProtein higher-order structure (HOS) is key to biological function because the mechanisms of protein machinery are encoded in protein three-dimensional structures. Mass spectrometry (MS)-based protein footprinting is advancing protein structure characterization by mapping solvent-accessible regions of proteins and changes in H-bonding, thereby providing higher order structural information. Footprinting provides insights into protein dynamics, conformational changes, and interactions, and when conducted in a differential way, can readily reveal those regions that undergo conformational change in response to perturbations such as ligand binding, mutation, thermal stress, or aggregation.
View Article and Find Full Text PDFDalton Trans
December 2024
Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan.
This study investigates the mechanism of prototropic tautomerization in metal-bound asymmetric pyrazole (R-PzH) ligands during Cu(II)-mediated PzH-MeCN coupling reactions. Intrinsic prototropic tautomerization of metal-bound ligands has not been previously documented. Various new bis-pyrazolylamidino Cu(II) complexes, [Cu(R-Pz(HNC(Me)))(ClO)], from the coupling reaction, and tetrakis pyrazole Cu(II) complexes, [Cu(R-PzH)(ClO)], with symmetric and asymmetric -monosubstituted R-PzH ligands were synthesized and characterized.
View Article and Find Full Text PDFFEBS J
November 2024
Department of Biomedical Sciences, University of Copenhagen, Denmark.
Copper is an essential micronutrient and yet is highly toxic to cells at elevated concentrations. P-ATPase proteins are critical for this regulation, providing active extrusion across cellular membranes. One unique molecular adaptation of P-ATPases compared to other P-type ATPases is the presence of metal-binding domains (MBDs) at the cytosolic termini, which however are poorly characterized with an elusive mechanistic role.
View Article and Find Full Text PDFChemistry
January 2025
Department of Chemistry, Central University of Rajasthan, Bandarsindri, Ajmer, 305817, India.
Inhibition of amyloid β (Aβ) aggregation and cholinesterase activity are two major therapeutic targets for Alzheimer's disease (AD). Multifunctional Molecules (MFMs) specifically designed to address other contributing factors, such as metal ion induced abnormalities, oxidative stress, toxic Aβ aggregates etc. are very much required.
View Article and Find Full Text PDFACS Omega
August 2024
Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States.
A copper complex supported by a redox-active bipyridyl--heterocyclic carbene based ligand framework is reported. From X-ray crystallography, the tetradentate macrocycle provides a distorted square planar geometry around the copper metal center. The complex was investigated for the electrocatalytic CO reduction reaction (CORR) in acetonitrile solutions.
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