通过动态核极化增强固态NMR对原生细菌生物膜进行超灵敏性表征
Chang-Hyeock Byeon1, Ted Kinney1, Hakan Saricayir1
1Department of Structural Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, 15261, USA.
Angewandte Chemie (International ed. in English)
|January 8, 2025
概括
动态核极化 (DNP) 固态NMR (ssNMR) 允许对本地细菌生物膜进行高分辨率的结构分析. 这一突破增强了对生物膜组成和结构的理解,有助于对抗耐药性感染.
科学领域:
- 微生物学 微生物学
- 生物物理学的生物物理.
- 生物化学 生物化学
背景情况:
- 细菌生物膜对于持续性感染和抗菌素耐药性至关重要.
- 由于方法上的局限性,分析本地生物膜结构具有挑战性.
- 固态NMR (ssNMR) 具有潜力,但面临着未标记样本的敏感性问题.
研究的目的:
- 应用高灵敏度动态核极化 (DNP) ssNMR用于表征本地细菌生物膜.
- 为了克服生物膜分析的传统ssNMR的灵敏度限制.
- 为了使结构特征能够在没有同位素标记或样本修改的情况下进行.
主要方法:
- 使用DNP增强的ssNMR用于本地Pseudomonas光生物膜的结构特征.
- 获得了1D和2DssNMR光谱 (13C/15N,1H-13C,1H-15N,13C) 迅速.
- 采用了有利的冷条件,用于定量检测柔性和刚性生物膜组件.
主要成果:
- 通过DNP ssNMR实现了~75倍的灵敏度增强.
- 成功识别和量化了细胞外矩阵 (ECM) 组件.
- 启用快速数据采集 (秒到小时) 用于生物膜分析.
结论:
- 这项研究是第一个使用DNP ssNMR进行本地细菌生物膜表征的研究.
- DNP ssNMR显著提高了分析各种体外和体外生物膜的能力.
- 这种多功能方法将加速针对生物膜相关感染的结构导向策略.
相关概念视频
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
230
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...
230
Applications Of NMR In Biology
3.7K
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.
3.7K
Double Resonance Techniques: Overview
190
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...
190
¹³C NMR: ¹H–¹³C Decoupling
1.0K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.0K


