細胞内MAS NMR:生体細胞からの生理学的手がかり
Giorgia Zandomeneghi1, Karin Ilg, Markus Aebi
1Physical Chemistry, ETH Zurich, Wolfgang-Pauli Str. 10, 8093 Zurich, Switzerland.
Journal of the American Chemical Society
|October 4, 2012
まとめ
研究者は,核磁気共振 (NMR) スペクトロスコーピーを用いて生きたサルモネラ・エンテリカ・セロバール・タイフィムリウム (Typhimurium) を研究した. 彼らは,成熟期中のO-アセチル化状態を含む,細菌の外膜のO-抗原の変化を観察した.
科学分野:
- 微生物学と生化学について
- 生物物理化学 生物物理化学
- 構造生物学 構造生物学とは
背景:
- バイオ分子に関する構造情報は,通常,精製された in vitro サンプルから得られます.
- 核磁共振 (NMR) スペクトロスコピーは,無傷の細胞または生物体内のバイオ分子を分析する可能性を秘めています.
- Salmonella enterica serovar Typhimuriumは,ヒトの胃腸炎の重要な原因となっている.
研究 の 目的:
- 生きたサルモネラ・エンテリカ・セロバール・タイフィムリウム (Typhimurium) の成熟過程を調査する.
- 成熟中の細菌外膜のO抗原の組成を監視するために.
- O-抗原の組成におけるO-アセチル化状態の役割とそのワクチン開発への潜在的な影響を評価する.
主な方法:
- 高解像度マジック・アングル・スピニング (MAS) NMRスペクトロスコピーを採用した.
- この研究は,生きた細菌細胞の生理学的分析に焦点を当てた.
- O-抗原組成とO-アセチル化状態の特徴づけが行われました.
主要な成果:
- この研究は,生きているサルモネラ菌のO抗原の組成を成功裏に追跡した.
- O-抗原組成の進化が検出され,特徴づけられました.
- O抗原のO-アセチル化状態の変化が特定されました.
結論:
- NMR光譜は,細菌全体の成熟過程を研究するための有効な方法です.
- O-抗原の組成,特にそのO-アセチル化状態は,サルモネラ菌の成熟過程で進化する.
- これらの変化を理解することは,サルモネラ菌感染症に対する潜在的なワクチン開発戦略にとって極めて重要です.
関連する概念動画
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...
The...
Nuclear Magnetic Resonance (NMR): Overview
Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Protein Dynamics in Living Cells
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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...
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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...
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...

