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Related Concept Videos

Rab Cascades01:25

Rab Cascades

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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Rab Proteins01:14

Rab Proteins

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Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
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Related Experiment Video

Updated: Jun 4, 2025

Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis
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Motor Function of the Two-Component EEA1-Rab5 Revealed by dcFCCS.

Joan Antoni Soler1, Anupam Singh1,2, Marino Zerial1

  • 1Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|December 20, 2024
PubMed
Summary
This summary is machine-generated.

Dual-color fluorescence cross-correlation spectroscopy (dcFCCS) revealed motor protein function. This single-molecule technique probed flexibility changes in tethering protein EEA1 and small GTPase Rab5.

Keywords:
Dual labelingDual-color fluorescence cross-correlation spectroscopySmall GTPaseTethering proteins

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Area of Science:

  • Biophysics
  • Molecular Biology

Background:

  • Fluorescence correlation spectroscopy (FCS) is a powerful single-molecule technique.
  • FCS measures fluctuations at nanosecond timescales and nanometer spatial resolution.
  • It is widely used to study molecular transport and flexibility of polymers and biomolecules.

Purpose of the Study:

  • To apply dual-color fluorescence cross-correlation spectroscopy (dcFCCS) to investigate molecular motor function.
  • To probe flexibility changes in the tethering protein EEA1 and the small GTPase Rab5.

Main Methods:

  • Utilized dual-color fluorescence cross-correlation spectroscopy (dcFCCS).
  • Analyzed end-monomer fluctuations to assess protein flexibility.

Main Results:

  • Successfully identified the motor function of EEA1 and Rab5.
  • Quantified flexibility changes associated with their motor activity.

Conclusions:

  • dcFCCS is effective for characterizing motor protein function at the single-molecule level.
  • This study provides insights into the mechanics of EEA1 and Rab5.