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The precious fluorine on the ring: fluorine NMR for biological systems
Jul 10, 2020 - 8:40 PM - by nmrlearner
nmrlearner's Avatar The precious fluorine on the ring: fluorine NMR for biological systems

Abstract

The fluorine-19 nucleus was recognized early to harbor exceptional properties for NMR spectroscopy. With 100% natural abundance, a high gyromagnetic ratio (83% sensitivity compared to 1H), a chemical shift that is extremely sensitive to its surroundings and near total absence in biological systems, it was destined to become a favored NMR probe, decorating small and large molecules. However, after early excitement, where uptake of fluorinated aromatic amino acids was explored in a series of animal studies, 19F-NMR lost popularity, especially in large molecular weight systems, due to chemical shift anisotropy (CSA) induced line broadening at high magnetic fields. Recently, two orthogonal approaches, (i) CF3 labeling and (ii) aromatic 19F-13C labeling leveraging the TROSY (Transverse Relaxation Optimized Spectroscopy) effect have been successfully applied to study large biomolecular systems. In this perspective, we will discuss the fascinating early work with fluorinated aromatic amino acids, which reveals the enormous potential of these non-natural amino acids in biological NMR and the potential of 19F-NMR to characterize protein and nucleic acid structure, function and dynamics in the light of recent developments. Finally, we explore how fluorine NMR might be exploited to implement small molecule or fragment screens that resemble physiological conditions and discuss the opportunity to follow the fate of small molecules in living cells.



... [Read More]
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Protein Crystallization & Crystallography Market by Technology, Product & Service, Consumable, End-user, and Region - Global Forecast to 2025 - ResearchAndMarkets.com - Business Wire
Jul 10, 2020 - 8:40 PM - by nmrlearner
nmrlearner's Avatar Protein Crystallization & Crystallography Market by Technology, Product & Service, Consumable, End-user, and Region - Global Forecast to 2025 - ResearchAndMarkets.com - Business Wire

Protein Crystallization & Crystallography Market by Technology, Product & Service, Consumable, End-user, and Region - Global Forecast to 2025 - ResearchAndMarkets.com Business Wire Read here
0 Replies | 1 Views
Protein Crystallization and Crystallography Market Worth $1.7 Billion by 2025 - Exclusive Report by MarketsandMarkets™ - Press Release - Digital Journal
Jul 10, 2020 - 8:40 PM - by nmrlearner
nmrlearner's Avatar Protein Crystallization and Crystallography Market Worth $1.7 Billion by 2025 - Exclusive Report by MarketsandMarkets™ - Press Release - Digital Journal

Protein Crystallization and Crystallography Market Worth $1.7 Billion by 2025 - Exclusive Report by MarketsandMarkets™ - Press Release Digital Journal Read here
0 Replies | 1 Views
[NMR paper] When Less Is More: Combining Site-Specific Isotope Labeling and NMR Unravels Structural Details of Huntingtin Repeats.
Jul 10, 2020 - 8:40 PM - by nmrlearner
nmrlearner's Avatar When Less Is More: Combining Site-Specific Isotope Labeling and NMR Unravels Structural Details of Huntingtin Repeats.

Related Articles When Less Is More: Combining Site-Specific Isotope Labeling and NMR Unravels Structural Details of Huntingtin Repeats.

Structure. 2020 Jul 07;28(7):730-732

Authors: Delhommel F, Sattler M

Abstract
In this issue of Structure, Urbanek et*al. (2020a) combine site-specific isotope labeling and NMR spectroscopy to investigate opposing effects of flanking regions onto the conformation of the poly-Q region in Huntingtin. Poly-Q interactions with preceding residues promote an ?-helical conformation while a following proline-rich region favors extended conformations.


PMID: 32640252 [PubMed - in process]



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[NMR paper] 1H NMR-Based Metabolomics Coupled With Molecular Docking Reveal the Anti-Diabetic Effects and Potential Active Components of Berberis vernae on Type 2 Diabetic Rats.
Jul 10, 2020 - 8:40 PM - by nmrlearner
nmrlearner's Avatar 1H NMR-Based Metabolomics Coupled With Molecular Docking Reveal the Anti-Diabetic Effects and Potential Active Components of Berberis vernae on Type 2 Diabetic Rats.

Related Articles 1H NMR-Based Metabolomics Coupled With Molecular Docking Reveal the Anti-Diabetic Effects and Potential Active Components of Berberis vernae on Type 2 Diabetic Rats.

Front Pharmacol. 2020;11:932

Authors: Li Q, Zhao C, Zhang Y, Du H, Xu T, Xu X, Zhang J, Kuang T, Lai X, Fan G, Zhang Y

Abstract
The dried stem bark of Berberis vernae C.K.Schneid., known as "Xiao-bo-pi" in Chinese, is a representative anti-diabetic herb in traditional Tibetan medical system. However, its anti-diabetic mechanisms and active components... [Read More]
0 Replies | 1 Views
[NMR paper] In Situ Detection of Endogenous HIV Activation by Dynamic Nuclear Polarization NMR and Flow Cytometry.
Jul 08, 2020 - 5:24 PM - by nmrlearner
nmrlearner's Avatar In Situ Detection of Endogenous HIV Activation by Dynamic Nuclear Polarization NMR and Flow Cytometry.

Related Articles In Situ Detection of Endogenous HIV Activation by Dynamic Nuclear Polarization NMR and Flow Cytometry.

Int J Mol Sci. 2020 Jun 30;21(13):

Authors: Overall SA, Price LE, Albert BJ, Gao C, Alaniva N, Judge PT, Sesti EL, Wender PA, Kyei GB, Barnes AB

Abstract
We demonstrate for the first time in-cell dynamic nuclear polarization (DNP) in conjunction with flow cytometry sorting to address the cellular heterogeneity of in-cell samples. Utilizing a green fluorescent protein (GFP) reporter of HIV reactivation, we correlate increased 15N resonance intensity with cytokine-driven HIV reactivation in a human cell line model of HIV latency. As few as 10% GFP+ cells could be detected by DNP nuclear magnetic resonance (NMR). The inclusion of flow cytometric sorting of GFP+ cells prior to analysis by DNP-NMR further boosted signal detection through increased cellular homogeneity with respect to GFP expression. As few as 3.6 million 15N-labeled GFP+ cells could be readily detected with DNP-NMR. Importantly, cell sorting allowed for the comparison of cytokine-treated GFP+ and GFP- cells in a batch-consistent way. This provides an avenue for normalizing NMR spectral contributions from background cellular processes following treatment with cellular modulators. We also demonstrate the... [Read More]
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[NMR paper] How does the mood stabilizer lithium bind ATP, the energy Earnings of the cell: Insights from solid-state NMR.
Jul 08, 2020 - 5:24 PM - by nmrlearner
nmrlearner's Avatar How does the mood stabilizer lithium bind ATP, the energy Earnings of the cell: Insights from solid-state NMR.

Related Articles How does the mood stabilizer lithium bind ATP, the energy Earnings of the cell: Insights from solid-state NMR.

Biochim Biophys Acta Gen Subj. 2020 01;1864(1):129456

Authors: Haimovich A, Goldbourt A

Abstract
BACKGROUND: Lithium, in the form of a salt, is a mood stabilizer and a leading drug for the treatment of bipolar disorder. It has a very narrow therapeutic range and a variety of side effects. Lithium can replace magnesium and other cations in enzymes and small molecules, among them ATP, thereby affecting and inhibiting many biochemical pathways. The form of binding of lithium ions to ATP is not known.
METHODS: Here we extract the binding environment of lithium in solid ATP using a multi-nuclear multi-dimensional solid-state NMR approach.
RESULTS: We determine that the coordination sphere of lithium includes, at a distance of 3.0(±0.4) Å, three phosphates; the two... [Read More]
0 Replies | 7 Views
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