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Applications Of NMR In Biology01:25

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
The...
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...

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NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode
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15N グループ選択性 STD NMR 方法を用いた分子認識とスクリーニング

Katalin E Kövér1, Patrick Groves, Jesús Jiménez-Barbero

  • 1Department of Inorganic and Analytical Chemistry, Centre of Arts, Humanities and Sciences, University of Debrecen, Egyetem tér 1, H-4010 Debrecen, Hungary. kover@tigris.unideb.hu

Journal of the American Chemical Society
|August 29, 2007
PubMed
まとめ

新しい飽和移転差 (STD) 実験では,15Nラベルを貼った分子を使用して,クリーンで人工物のないスペクトルを得ています. この方法は,リガンドのスクリーニングを簡素化し,重複する信号であっても分子相互作用を研究します.

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科学分野:

  • 核磁共振 (NMR) スペクトロスコピー
  • 化学生物学 化学生物学とは
  • バイオフィジックス 生物物理学

背景:

  • 標準飽和移転差 (STD) NMR実験は,特にホストとゲストの陽子信号が重なり合う場合,最適化することが困難です.
  • クリーンなスペクトルを達成するには,多くの場合,広範なパラメータチューニングと制御実験が必要です.

研究 の 目的:

  • 分子間相互作用を研究するための新しい,人工物のない飽和移転差 (STD) NMR実験を開発する.
  • 複雑な生物系におけるリガンドのスクリーニングと分析を簡素化する.

主な方法:

  • BIRDのパルス列を用いたグループ選択的 (GS) 飽和法を使用して,15Nラベル付きホストのアミド陽子を選択的に飽和させました.
  • (15) N キャリア周波数を切り替える差分光譜法を使用して,残余の背景陽子飽和をキャンセルしました.
  • この実験は,グリコペプチド抗生物質 (ダイメリックエレモミシン) と細胞壁アナログペプチド (N-Ac-D-Ala) モデルシステムを使用して検証されました.

主要な成果:

  • 小説 (15)N-GS STD実験では,アミド陽子の選択的飽和が成功しました.
  • 複雑な最適化や制御実験なしに,クリーンで人工物のないSTDスペクトルが得られた.
  • この方法は,モデルシステムにおけるホストとゲストの (1) H 信号の重複を効果的に解決しました.

結論:

  • (15) N-GS STD実験は,分子間相互作用を研究するための堅牢で簡素化されたアプローチを提供します.
  • この技術は,クリーンなオン共振周波数や定義されたリガンドライブラリがなくても,タンパク質に対するリガンドスクリーニングに非常に適用可能です.
  • 開発された方法は,標準的なSTD NMRの限界を克服し,化学生物学におけるより広範なアプリケーションを可能にします.