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Related Concept Videos

Rab Proteins01:14

Rab Proteins

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...
Rab Cascades01:25

Rab Cascades

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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Related Experiment Video

Updated: Jun 30, 2026

Preparation of Rat Oligodendrocyte Progenitor Cultures and Quantification of Oligodendrogenesis Using Dual-infrared Fluorescence Scanning
11:11

Preparation of Rat Oligodendrocyte Progenitor Cultures and Quantification of Oligodendrogenesis Using Dual-infrared Fluorescence Scanning

Published on: February 17, 2016

Role for Rab3a in oligodendrocyte morphological differentiation.

Mihaela Anitei1, Ann E Cowan, Steven E Pfeiffer

  • 1Department of Neuroscience, University of Connecticut Medical School, Farmington, Connecticut 06030-3401, USA.

Journal of Neuroscience Research
|September 18, 2008
PubMed
Summary

Rab3a protein is crucial for mature oligodendrocyte differentiation and myelin formation. Its specific role in stimulating morphological changes suggests it is key to myelin membrane biogenesis.

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Last Updated: Jun 30, 2026

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Rab3a, a small GTPase, is upregulated during oligodendrocyte terminal differentiation and myelin synthesis.
  • Oligodendrocytes are glial cells responsible for myelin production in the central nervous system.

Purpose of the Study:

  • To investigate the role of Rab3a in oligodendrocyte morphological differentiation.
  • To determine if Rab3a is involved in myelin membrane biogenesis.

Main Methods:

  • Rab3a overexpression and siRNA-mediated silencing in oligodendrocytes.
  • Analysis of oligodendrocyte morphological differentiation and lineage progression.
  • Identification of other exocytic small GTPases in oligodendrocytes.

Main Results:

  • Rab3a silencing delayed mature oligodendrocyte differentiation but did not affect progenitor lineage progression.
  • Overexpression of GTP-bound Rab3a, but not wild-type, delayed oligodendrocyte differentiation.
  • Rab27B and RalA were identified as other exocytic small GTPases in oligodendrocytes.

Conclusions:

  • Rab3a specifically stimulates morphological differentiation in mature oligodendrocytes.
  • Rab3a is likely part of the molecular machinery essential for myelin membrane biogenesis.