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2,4-Dichlorophenoxyacetic Acid in the Gas and Crystal Phases and Its Intercalation in Montmorillonite-An Experimental and Theoretical Study.
Molecules
January 2025
Instituto Andaluz de Ciencias de la Tierra (IACT-CSIC), Consejo Superior de Investigaciones Científicas, Av. de las Palmeras 4, 18100 Armilla, Granada, Spain.
Many properties of 2,4-dichlorophenoxyacetic acid (2,4-D) depend on its molecular environment, such as whether it is an isolated molecule, a dimer, or in a crystalline state. The molecular geometry, conformational analysis, and vibrational spectrum of 2,4-D were theoretically calculated using Density Functional Theory (DFT) methods. A new slightly more stable conformer was found, which is different to those previously reported.
View Article and Find Full Text PDFEvaluation of TOCSY mixing for sensitivity-enhancement in solid-state NMR and application of 4D experiments for side-chain assignments of the full-length 30 kDa membrane protein GlpG.
J Biomol NMR
January 2025
Research Unit Molecular Biophysics, Leibniz-Forschungsinstitut für Molekulare Pharmakologie, Robert- Rössle-Straße 10, 13125, Berlin, Germany.
Chemical shift assignments of large membrane proteins by solid-state NMR experiments are challenging. Recent advancements in sensitivity-enhanced pulse sequences, have made it feasible to acquire H-detected 4D spectra of these challenging protein samples within reasonable timeframes. However, obtaining unambiguous assignments remains difficult without access to side-chain chemical shifts.
View Article and Find Full Text PDFBackbone and Sidechain H, N and C Resonance Assignments of a Multidrug Efflux Membrane Protein using Solution and Solid-State NMR.
bioRxiv
January 2025
Department of Biochemistry, University of Wisconsin-Madison, Madison, WI, 53706 USA.
EmrE is a bacterial membrane-embedded multidrug transporter that functions as an asymmetric homodimer. EmrE is implicated in antibiotic resistance, but is now known to confer either resistance or susceptibility depending on the identity of the small molecule substrate. Here, we report both solution- and solid-state NMR assignments of S64V-EmrE at pH 5.
View Article and Find Full Text PDFBlock synthesis of Forssman pentasaccharide GalNAcα1-3GalNAcβ1-3Galα1-4Galβ1-4Glcβ in the form of 3-aminopropyl glycoside.
Carbohydr Res
March 2025
M. M. Shemyakin-Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, GSP-7, Ulitsa Miklukho-Maklaya, 117997, Moscow, Russian Federation. Electronic address:
A total chemical synthesis of spacer-armed Forssman pentasaccharide is reported. The choice of the 2(donor) + 3(acceptor) block scheme, the optimal combination of a limited number of simple protecting groups and the sequence of deprotection steps allowed to achieve the high yield and stereoselectivity of glycosylation and to avoid losses during deprotection. The target pentasaccharide was obtained in a 10-mg scale.
View Article and Find Full Text PDFAssignment of the N-terminal domain of mouse cGAS.
Biomol NMR Assign
January 2025
Department of Chemistry and Chemical Biology, TU Dortmund University, Dortmund, Germany.
Cyclic GMP-AMP synthase (cGAS) is a DNA-sensing enzyme that is a member of the nucleotidyltransferase (NTase) family and functions as a DNA sensor. The protein is comprised of a catalytic NTase core domain and an unstructured hypervariable N-terminal domain (NTD) that was reported to increase protein activity by providing an additional DNA-binding surface. We report nearly complete H, N, and C backbone chemical-shift assignments of mouse cGAS NTD (residues 5-146), obtained with a set of 3D and 4D solution NMR experiments.
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