超高速MAS固体NMRは,パラ磁性金属タンパク質における13Cおよび1Hの広範な検出を可能にします
Ivano Bertini1, Lyndon Emsley, Moreno Lelli
1Magnetic Resonance Center, CERM, University of Florence, Sesto Fiorentino, Italy. ivanobertini@cerm.unifi.it
Journal of the American Chemical Society
|April 2, 2010
まとめ
この研究は,パラマグネティックタンパク質の金属調整残基からの固体核磁気共振 (NMR) 信号の観測と割り当てを実証しています. これらの発見は,最小のサンプル量を用いて金属タンパク質の詳細な構造分析を可能にします.
科学分野:
- 生物物理化学 生物物理化学
- 構造生物学 構造生物学とは
- 固体核磁気共鳴 (NMR) スペクトロスコーピーの固体核磁気共鳴 (NMR) スペクトロスコーピーは,固体核磁気共鳴 (NMR) スペクトロスコーピーの固体核磁気共鳴 (NMR) スペクトロスコーピーの固体核磁気共鳴 (NMR) の固体核磁気共鳴 (NMR) の固体核磁気共鳴 (NMR) の固体核磁気共鳴 (NMR) の固体核磁気共鳴 (NMR) の固体核磁気共鳴 (NMR) の固体磁気共鳴 (NMR) の固体磁気共鳴 (NMR) の固体磁気共鳴 (NMR) の固体磁気共鳴 (NMR) の固体磁気共鳴 (NMR) の固体磁気共鳴 (NMR) の固体磁気共鳴 (NMR)
背景:
- 固体状態のパラマグネティック金属タンパク質の研究は,信号の拡大による課題を提示します.
- 金属調整残留物の共鳴を観察することは,金属タンパク質の構造と機能を理解するために極めて重要です.
研究 の 目的:
- パラマグネティック金属タンパク質の高解像度分析のための先進的な固体NMR技術を開発し,適用する.
- 高度にパラ磁性タンパク質の金属中心を直接調整する残留物からNMR共振を割り当てます.
主な方法:
- マトリックス金属タンパク質酶12 (CoMMP-12) のコバルト (II) に置換された触媒ドメインに60kHzの超高速マジック・アングル・スピニング (MAS) を利用した.
- 高磁場 (21.2 T) と低電力の照射を用いて,パラマグネティックセンターからの強化されたリラックスを利用した.
- 既知の結晶構造データを用いて,偽接触シフト (PCS) を分析した.
主要な成果:
- 固体状態のCoMMP-12における金属座標残基からの炭素-13 ((13) C) と陽子 (1H) の共振を成功裏に観測し,割り当てました.
- 1mg未満のサンプルで非常に短い時間でこれらの観測を達成しました.
- 異なったシフトへのPCSの貢献を区別し,測定し,調整リガンドまで構造的な洞察を提供します.
結論:
- パラマグネティック金属タンパク質を研究するために,固体NMRのアプローチを合わせたことを実証しました.
- 最小のサンプルでメタルプロテイン活性部位の詳細な構造的特徴づけを可能にしました.
- 偽接触シフトの分析を通じて構造情報を明らかにした.
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...
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...
Double Resonance Techniques: Overview
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
Proteomics
A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...

