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» Welcome! Welcome, NMR world! Our visitors map. » Log in User Name Remember Me? Not a member yet? Register Now! Password NMR detection and conformational dependence of two, three, and four-bond isotope shifts due to deuteration of backbone amides Apr 25, 2023 - 1:59 PM - by nmrlearner NMR detection and conformational dependence of two, three, and four-bond isotope shifts due to deuteration of backbone amides Abstract NMR isotope shifts occur due to small differences in nuclear shielding when nearby atoms are different isotopes. For molecules dissolved in 1:1 H2O:D2O, the resulting mixture of N-H and N-D isotopes leads to a small splitting of resonances from adjacent nuclei. We used multidimensional NMR to measure isotope shifts for the proteins CUS-3iD and CspA. We observed four-bond 4â??N(ND) isotope shifts in high-resolution 2D 15N-TROSY experiments of the perdeuterated proteins that correlate with the torsional angle psi. Three-bond 3â??Câ??(ND) isotope shifts detected in H(N)CO spectra correlate with the intraresidue H-O distance, and to a lesser extent with the dihedral angle phi. The conformational dependence of the isotope shifts agree with those previously reported in the literature. Both the 4â??N(ND) and 3â??Câ??(ND) isotope shifts are sensitive to distances between the atoms giving rise to the isotope shifts and the atoms experiencing the splitting, however, these distances are strongly correlated with backbone dihedral angles making it difficult to resolve distance from stereochemical contributions to the isotope shift. H(NCA)CO spectra were used to measure two-bond 2â??Câ??(ND) isotope shifts and [D]/[H] fractionation factors. Neither parameter showed significant differences for hydrogen-bonded sites, or changes over a 25° temperature range, suggesting they are not sensitive to hydrogen bonding. Finally, the quartet that arises from the combination of 2â??Câ??(ND) and 3â??Câ??(ND) isotope shifts in H(CA)CO spectra was used to measure synchronized hydrogen exchange for the sequence neighbors A315-S316 in the... [Read More] 0 Replies | 246 Views Protein Crystallization and Crystallography Market Size, Share ... - Digital Journal Apr 25, 2023 - 1:59 PM - by nmrlearner Protein Crystallization and Crystallography Market Size, Share ... - Digital Journal Protein Crystallization and Crystallography Market Size, Share ... Digital Journal Read here 0 Replies | 175 Views [NMR paper] Identification of a novel extracellular inhibitor of FGF2/FGFR signaling axis by combined virtual screening and NMR spectroscopy approach Apr 23, 2023 - 12:29 AM - by nmrlearner Identification of a novel extracellular inhibitor of FGF2/FGFR signaling axis by combined virtual screening and NMR spectroscopy approach The aberrant activation of the fibroblast growth factor 2 (FGF2)/fibroblast growth factor receptor (FGFR) signalling pathway drives severe pathologies, including cancer development and angiogenesis-driven pathologies. The perturbation of the FGF2/FGFR axis via extracellular allosteric small inhibitors is a promising strategy for developing FGFR inhibitors with improved safety and efficacy for cancer treatment. We have previously investigated the role of new extracellular inhibitors, such as... More... 0 Replies | 366 Views [NMR paper] A solution NMR view of lipidic cubic phases: Structure, dynamics, and beyond Apr 23, 2023 - 12:29 AM - by nmrlearner A solution NMR view of lipidic cubic phases: Structure, dynamics, and beyond Nuclear magnetic resonance (NMR) spectroscopy is well-established nowadays for the elucidation of the 3D structures of proteins and protein complexes, the evaluation of biomolecular dynamics with atomistic resolution across a range of time scales, the screening of drug candidates with site specificity, and for the quantitation of molecular translational diffusion. Lyotropic lipidic cubic phases (LCPs) are lipid bilayer-based materials with a complex geometry, formed via the spontaneous... More... 0 Replies | 225 Views [NMR paper] Paramagnetic NMR restraints for the characterization of protein structural rearrangements Apr 20, 2023 - 8:34 PM - by nmrlearner Paramagnetic NMR restraints for the characterization of protein structural rearrangements Mobility is a common feature of biomacromolecules, often fundamental for their function. Thus, in many cases, biomacromolecules cannot be described by a single conformation, but rather by a conformational ensemble. NMR paramagnetic data demonstrated quite informative to monitor this conformational variability, especially when used in conjunction with data from different sources. Due to their long-range nature, paramagnetic data can, for instance, i) clearly demonstrate the occurrence of... More... 0 Replies | 353 Views [NMR paper] Structural polymorphism of the low-complexity C-terminal domain of TDP-43 amyloid aggregates revealed by solid-state NMR Apr 19, 2023 - 1:38 PM - by nmrlearner Structural polymorphism of the low-complexity C-terminal domain of TDP-43 amyloid aggregates revealed by solid-state NMR Aberrant aggregation of the transactive response DNA-binding protein (TDP-43) is associated with several lethal neurodegenerative diseases, including amyotrophic lateral sclerosis and frontotemporal dementia. Cytoplasmic neuronal inclusions of TDP-43 are enriched in various fragments of the low-complexity C-terminal domain and are associated with different neurotoxicity. Here we dissect the structural basis of TDP-43 polymorphism using magic-angle spinning solid-state NMR spectroscopy in... More... 0 Replies | 270 Views Study uncovers a novel fold within the SARS-CoV-2 replication co-factor non-structural protein 9 - News-Medical.Net Apr 16, 2023 - 11:19 PM - by nmrlearner Study uncovers a novel fold within the SARS-CoV-2 replication co-factor non-structural protein 9 - News-Medical.Net Study uncovers a novel fold within the SARS-CoV-2 replication co-factor non-structural protein 9 News-Medical.Net Read here 0 Replies | 260 Views [NMR paper] Herman Berendsen's NMR Research in Groningen and Some Memories from a Fan Apr 16, 2023 - 11:19 PM - by nmrlearner Herman Berendsen's NMR Research in Groningen and Some Memories from a Fan This paper describes the scientific work of Prof. Dr. Herman Berendsen on NMR spectroscopy and includes some personal notes. Since 1975, Berendsen and the author were colleagues in the Physical Chemistry group in Groningen for a period of 12 years. More... 0 Replies | 299 Views Page 97 of 100 « First < 47 87 95 96 97 98 99 > Last »

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