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Intracellular Pocket Conformations Determine Signaling Efficacy through the μ Opioid Receptor.
J Chem Inf Model
January 2025
Department of Chemistry, Illinois Institute of Technology, Chicago, Illinois 60616, United States.
It has been challenging to determine how a ligand that binds to a receptor activates downstream signaling pathways and to predict the strength of signaling. The challenge is compounded by functional selectivity, in which a single ligand binding to a single receptor can activate multiple signaling pathways at different levels. Spectroscopic studies show that in the largest class of cell surface receptors, 7 transmembrane receptors (7TMRs), activation is associated with ligand-induced shifts in the equilibria of intracellular pocket conformations in the absence of transducer proteins.
View Article and Find Full Text PDFThe investigation of the interaction of warangalone with transferrin as a therapeutic biological macromolecule and the formation of a protein-ligand nanocomplex with superior anticancer activity against lung cancer cells.
Int J Biol Macromol
January 2025
Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai 200443, China. Electronic address:
Though warangalone has shown anticancer properties against breast cancer cells, its colloidal stability and therapeutic index ought to be improved using a potential strategy, especially via protein-based (nano)carriers. In this research, transferrin was used as a plasma protein for the development of the warangalone-transferrin NPs. To investigate the mechanism underlying the formation of this complex, the interaction between warangalone and transferrin, as well as transferrin NPs, was analyzed using spectroscopic methods.
View Article and Find Full Text PDFMechanically interlocked two-dimensional polymers.
Science
January 2025
Department of Chemistry, Northwestern University, Evanston, IL, USA.
Mechanical bonds arise between molecules that contain interlocked subunits, such as one macrocycle threaded through another. Within polymers, these linkages will confer distinctive mechanical properties and other emergent behaviors, but polymerizations that form mechanical bonds efficiently and use simple monomeric building blocks are rare. In this work, we introduce a solid-state polymerization in which one monomer infiltrates crystals of another to form a macrocycle and mechanical bond at each repeat unit of a two-dimensional (2D) polymer.
View Article and Find Full Text PDFEco-friendly sensing of hexavalent chromium ions via copper-doped carbon quantum dots: a fluorescent probe for water safety.
Mikrochim Acta
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Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, Damanhour, 22511, AlBeheira, Egypt.
The hydrothermal synthesis is presented of copper-doped carbon dots (Cu-CDs) from citric acid, urea, and copper chloride, resulting in blue-fluorescent particles with stable emission at 438 nm when excited at 340 nm. Through comprehensive spectroscopic and microscopic characterization (FTIR, XPS, UV, and HRTEM), the Cu-CDs demonstrated remarkable stability across varying pH levels, ionic strengths, temperatures, and UV exposure. Notably, Cu-CDs exhibit ultra-sensitive and selective detection of hexavalent chromium [Cr(VI)] ions in aqueous environments driven by fluorescence quenching.
View Article and Find Full Text PDFInvestigation of Spectroscopic Parameters and Trap Parameters of Eu-Activated YSiO Phosphors for Display and Dosimetry Applications.
Molecules
December 2024
Department of Science and Humanities, School of Engineering and Technology, CHRIST University, Bangalore 560029, Karnataka, India.
Using the solid-state reaction technique, varied YSiO phosphors activated by europium (Eu) ions at varied concentrations were made at calcination temperatures of 1000 °C and 1250 °C during sintering in an air environment. The XRD technique identified the monoclinic structure, and the FTIR technique was used to analyze the generated phosphors. Photoluminescence emission and excitation patterns were measured using varying concentrations of Eu ions.
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