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Related Concept Videos

Fluid Mosaic Model01:19

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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Related Experiment Video

Updated: Jul 4, 2025

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Contact-FP: A Dimerization-Dependent Fluorescent Protein Toolkit for Visualizing Membrane Contact Site Dynamics.

Gregory E Miner1, Sidney Y Smith1, Wendy K Showalter1

  • 1Department of Cell Biology and Physiology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.

Contact (Thousand Oaks (Ventura County, Calif.))
|February 8, 2024
PubMed
Summary

Researchers developed Contact-FP, a novel tool using dimerization-dependent fluorescent proteins, to visualize membrane contact site dynamics between organelles in live cells. This technology allows for precise observation of organelle interactions and cellular responses.

Keywords:
biosensorscaveolaeendoplasmic reticulumfluorescent proteinslipid dropletslysosomesmembrane contact sitesmitochondriaorganellesperoxisomesplasma membrane

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Membrane contact sites (MCSs) are crucial for cellular communication and are dynamic, yet challenging to study.
  • Existing tools for visualizing MCS dynamics in live cells are limited.
  • Dimerization-dependent fluorescent proteins (ddFPs) offer a promising approach for MCS visualization.

Purpose of the Study:

  • To engineer and validate a novel suite of ddFPs, named Contact-FP, for visualizing MCS dynamics.
  • To demonstrate the utility of Contact-FP probes in studying organelle interactions, specifically between lipid droplets and mitochondria.
  • To assess the ability of Contact-FP to visualize complex MCS configurations and perturbations.

Main Methods:

  • Engineering of Contact-FP probes targeting various organelles (LDs, ER, mitochondria, peroxisomes, lysosomes, plasma membrane, caveolae, cytoplasm).
  • Localization studies to confirm probe targeting to specific organelles.
  • Live-cell imaging to visualize MCS morphology and dynamics using Contact-FP pairs.
  • Perturbation studies involving overexpression of organelle tethers (e.g., PLIN5).

Main Results:

  • Contact-FP probes were successfully engineered and localized to their target organelles.
  • Contact-FP pairs specifically localized to the interface between apposed organelles.
  • The probes enabled visualization of dynamic changes in MCSs, including responses to PLIN5 overexpression.
  • Simultaneous visualization of multiple MCSs involving a single organelle was achieved.

Conclusions:

  • Contact-FP provides a versatile and powerful tool for studying the dynamics and morphology of membrane contact sites in live cells.
  • This technology overcomes previous limitations in visualizing dynamic organelle interactions.
  • Contact-FP probes can be optimized for studying MCSs between a wide range of organelle pairs.