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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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...
Chemical Ionization (CI) Mass Spectrometry01:21

Chemical Ionization (CI) Mass Spectrometry

The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
Spectroscopy of Carboxylic Acid Derivatives01:26

Spectroscopy of Carboxylic Acid Derivatives

Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and unsymmetrical carbonyl vibration.
In the...
Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
Double Resonance Techniques: Overview01:12

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.
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使用多价多功能甘氨酸量子点进行多价莱克-碳水化合物识别

Yuan Guo, Inga Nehlmeier1, Emma Poole

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概括

有密集糖阵的量子点 (QD) 作为多价值蛋白质-糖相互作用的强大探测器. 这些甘氨酸QD通过剖析乳素结合模式和量化亲缘关系,有效地抑制病毒的进入,有助于设计新的抗病毒策略.

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科学领域:

  • 生物化学
  • 纳米技术
  • 病毒学

背景情况:

  • 多价值蛋白-碳水化合物相互作用对于初始病毒/细菌-细胞接触和感染至关重要.
  • 由于缺乏灵活,复杂的细胞表面蛋白质的结构数据,因此设计有效的多价值抑制剂受到阻碍.
  • 像DC-SIGN和DC-SIGNR这样的lectins在HIV和埃博拉病毒的病毒入口增强中起着关键作用.

研究的目的:

  • 开发量子点 (QD),以显示单糖/二糖的密集阵列,作为多价值蛋白-糖相互作用的探测器.
  • 使用这些甘氨酸-QD来剖析结合模式并量化DC-SIGN和DC-SIGNR的结合性.
  • 评估甘-QDs作为DC-SIGN介导病毒进入的抑制剂的潜力.

主要方法:

  • 量子点 (QD) 的合成与密集的单糖/分糖组合功能化.
  • 使用弗斯特共振能量转移 (FRET),水力动态尺寸测量和传输电子显微镜 (TEM) 的组合来分析QD-lectin相互作用.
  • 开发一个QD-FRET方法来量化QD和DC-SIGN/DC-SIGNR之间的结合关系.

主要成果:

  • 在DC-SIGN和DC-SIGNR的四重,二重和单价结合模式之间成功区分了Glycan-QDs.
  • 一个QD-FRET试验显示,DC-SIGN与QD结合的强度是DC-SIGNR的100倍以上.
  • 通过DC-SIGN介导的EBOV-GP转导的强烈抑制,IC50值低至0. 7nM.

结论:

  • 甘氨酸显示QD是剖析复杂多价值蛋白质连接体识别的多功能工具.
  • 开发的QD-FRET方法准确量化了结合亲和力,并区分了乳素结合方式.
  • 通过向细胞层面的特定蛋白质- 甘氨酸相互作用,甘氨酸- 甘氨酸可以作为有效的病毒感染抑制剂.