Related Experiment Video
Updated: Jul 19, 2026

Analyzing the Function of Small GTPases by Microinjection of Plasmids into Polarized Epithelial Cells
Published on: May 31, 2011
Targeting Rab GTPases to distinct membrane compartments.
Suzanne Pfeffer1, Dikran Aivazian
1Department of Biochemistry, Stanford University School of Medicine, Stanford, California 94305-5307, USA. pfeffer@stanford.edu
Researchers uncovered new molecular details about Rab protein delivery and localization in eukaryotic cells. Discoveries include the structure of a Rab GTPase with its inhibitor and a membrane protein impacting Rab localization.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Rab GTPases regulate membrane trafficking in eukaryotic cells.
- Over 60 Rab proteins exist in human cells, each with specific compartment localization.
- Understanding Rab protein dynamics is crucial for cellular processes.
Purpose of the Study:
- To elucidate the molecular mechanisms of Rab protein delivery.
- To investigate the structural basis of Rab GTPase interaction with GDP-dissociation inhibitor.
- To uncover novel factors involved in Rab protein localization.
Main Methods:
- Structural determination of a monoprenylated Rab GTPase bound to GDP-dissociation inhibitor.
- Biochemical assays to study protein-protein interactions.
- Identification of integral membrane proteins affecting Rab-GDI binding.
Main Results:
- New molecular details of Rab GTPase-GDP-dissociation inhibitor complex structure were revealed.
- An integral membrane protein was discovered that dissociates prenylated Rab proteins from GDP-dissociation inhibitor.
- These findings provide insights into Rab protein delivery and localization pathways.
Conclusions:
- The study provides critical structural and mechanistic insights into Rab protein regulation.
- The identified membrane protein represents a novel factor in controlling Rab localization.
- Further research can explore therapeutic strategies targeting Rab-mediated transport.
More Related Videos
10:27Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells
Published on: March 9, 2012
13:51Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
Published on: November 11, 2018
Related Concept Videos
Coat Assembly and GTPases
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
Rab Proteins
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...
SNAREs and Membrane Fusion
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
Tail-anchoring of Proteins in the ER Membrane
Rab Cascades
Small GTPases - Ras and Rho
Three regulatory proteins control their activity: