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A pseudo-ring is a medium-sized cyclic structure, held together by a strong hydrogen bond, that can act as a mimetic of a covalently linked heterocycle. Molecules that contain pseudo-rings can switch between "open" and "closed" forms. This paper examines the utility of pseudo-ring constructs to control conformations and properties of macrocycles. The spectroscopic evidence suggests that the "open" and "closed" pseudo-ring-containing macrocycles differ in their three-dimensional characteristics, which results in markedly different lipophilicities. The dynamic nature of pseudo-rings has led to the emergence of tunable fluorescence that should be useful in environment-sensitive applications.
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http://dx.doi.org/10.1002/chem.202500581 | DOI Listing |
Acta Crystallogr D Struct Biol
October 2025
Turkish Accelerator and Radiation Laboratory, 06830 Ankara, Türkiye.
Membrane-protein quality control in Escherichia coli involves coordinated actions of the AAA+ protease FtsH, the insertase YidC and the regulatory complex HflKC. These systems maintain proteostasis by facilitating membrane-protein insertion, folding and degradation. To gain structural insights into a putative complex formed by FtsH and YidC, we performed single-particle cryogenic electron microscopy on detergent-solubilized membrane samples, from which FtsH and YidC were purified using Ni-NTA affinity and size-exclusion chromatography.
View Article and Find Full Text PDFOrg Biomol Chem
September 2025
Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Zinc(II) bis(triazolyl)(pyridyl)amine (Zn(BTPA)) complexes on the end of α-amino-iso-butyric acid (Aib) foldamers are able to transfer chirality from bound anions to the helical foldamer body. Zn(BTPA) could be obtained by simple synthetic methodology that allowed a range of functional groups to be installed around the binding site, exemplified with a fluorophore, a macrocyclic bridge and Aib itself. Changing functional group did not prevent chiral ligands from controlling foldamer conformation, although differences in complexation kinetics and equilibria were observed.
View Article and Find Full Text PDFACS Nano
September 2025
Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States.
Achieving high performance nanoscale photonic functionalities remains extraordinarily challenging when using naturally derived biomaterials. The ability to manipulate ultrathin films of structural proteins─combined with photolithographic control of their polymorphism─unlocks a compelling route toward engineering biopolymer-based photonic crystals with precisely defined photonic bandgaps and reconfigurable structural colors. In this work, we describe a robust, water-based fabrication process for silk/inorganic hybrid one-dimensional (1D) photonic crystals that overcomes many of the conventional difficulties in ensuring reproducibility, uniformity, and reliability at the nanoscale.
View Article and Find Full Text PDFBiochim Biophys Acta Mol Cell Biol Lipids
September 2025
Department of Biochemistry and Molecular Biology, The University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada; Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, V8W 2Y2, Canada; University of Victoria Genome BC Proteomics Centre, Vi
The class I phosphoinositide 3-kinase pathway (PI3K) is a master regulator of cellular growth, and plays essential roles in controlling immune cell function, metabolism, chemotaxis and proliferation. Activation of class I PI3Ks generates the signalling lipid PIP that activates multiple pro-growth signalling pathways. Class I PI3Ks can be activated by multiple plasma membrane stimuli, including G-protein coupled receptors, Ras superfamily GTPases, and receptor tyrosine kinases.
View Article and Find Full Text PDFPLoS One
September 2025
Department of Hepatobiliary Surgery, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China.
Objective: This study employs integrated network toxicology and molecular docking to investigate the molecular basis underlying 4-nonylphenol (4-NP)-mediated enhancement of breast cancer susceptibility.
Methods: We integrated data from multiple databases, including ChEMBL, STITCH, Swiss Target Prediction, GeneCards, OMIM and TTD. Core compound-disease-associated target genes were identified through Protein-Protein Interaction (PPI) network analysis.