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Related Concept Videos

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...

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Assembly Characterization of Human Equilibrium Nucleoside Transporter 1 (hENT1) by Inhibitor Probe-Based dSTORM

Binglin Sui1, Junling Chen1, Dian Ge1

  • 1Improve-WUST Joint Laboratory of Advanced Technology for Point-of-Care Testing and Precision Medicine, School of Chemistry & Chemical Engineering, Wuhan University of Science and Technology, 947 Heping Street, Wuhan, Hubei 430081, China.

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Summary

Researchers developed a new fluorescent probe and microscopy technique to visualize human equilibrative nucleoside transporter 1 (hENT1) at the single-molecule level. This reveals distinct hENT1 assembly patterns on cell membranes, offering insights into nucleoside metabolism and drug efficacy.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Imaging

Background:

  • Nucleoside transporters (NTs) are crucial for nucleoside metabolism and nucleoside drug effectiveness.
  • Understanding the spatial organization of NTs at the single-molecule level is vital for elucidating their biofunctions.
  • Current labeling and imaging methods have limitations for high-resolution observation of NTs.

Purpose of the Study:

  • To develop a novel fluorescent probe and advanced imaging technique for high-resolution visualization of human equilibrative nucleoside transporter 1 (hENT1).
  • To investigate the spatial distribution and assembly patterns of hENT1 on cell membranes.
  • To explore the factors influencing hENT1 assembly and its relationship with membrane components.

Main Methods:

  • Synthesis of SAENTA-Cy5, an inhibitor-based fluorescent probe specific for hENT1.
  • Application of direct stochastic optical reconstruction microscopy (dSTORM) for single-molecule imaging of hENT1.
  • Comparative analysis of SAENTA-Cy5 probe with traditional antibody probes for labeling specificity and efficiency.
  • Investigation of hENT1 associations with membrane carbohydrates, lipid rafts, and EpCAM.

Main Results:

  • SAENTA-Cy5 demonstrated superior labeling specificity and efficiency compared to antibody probes.
  • Distinct assembly patterns of hENT1 were observed on the apical and basal membranes.
  • hENT1 assembly patterns are influenced by interactions with membrane carbohydrates, lipid rafts, and associated proteins like EpCAM.

Conclusions:

  • The study presents an effective method for labeling and imaging hENT1 using SAENTA-Cy5 and dSTORM.
  • The findings reveal novel insights into the differential assembly of hENT1 on cell surfaces.
  • Understanding hENT1 assembly mechanisms enhances knowledge of nucleoside transport and metabolism, impacting nucleoside analogue drug development.