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Rab Proteins

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 Cascades

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.

Assembly of Signaling Complexes

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...

SNAREs and Membrane Fusion

SNAREs and Membrane Fusion

Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle 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...

Small GTPases - Ras and Rho

Small GTPases - Ras and Rho

Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:

Directing Proteins to the Rough Endoplasmic Reticulum

Directing Proteins to the Rough Endoplasmic Reticulum

The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...

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Related Experiment Video

Updated: Jun 24, 2026

Novel RNA-Binding Proteins Isolation by the RaPID Methodology

Novel RNA-Binding Proteins Isolation by the RaPID Methodology

Published on: September 30, 2016

Chapter 5: rab proteins and their interaction partners.

Angelika Barnekow¹, Anika Thyrock, Daniel Kessler

¹Department of Experimental Tumorbiology, University of Münster, Badestrasse 9, 48149 Münster, Germany.

International Review of Cell and Molecular Biology

|April 8, 2009

Summary

This summary is machine-generated.

Small GTPases, including Rab proteins, are key regulators of cell signaling and trafficking. Understanding their interactions is crucial for deciphering cellular functions and diseases like cancer.

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Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

The Ras superfamily comprises over 150 small proteins that act as molecular switches, cycling between GDP-bound inactive and GTP-bound active states.
These proteins are integral to signal transduction pathways regulating cell growth, trafficking, migration, and apoptosis.
The Rab family, the largest in the Ras superfamily, specifically governs vesicular transport pathways.

Purpose of the Study:

To explore methods for detecting and characterizing small GTPase interacting partners.
To enhance understanding of the physiological roles of small GTPases in both normal and cancerous cells.
To investigate the regulatory mechanisms and effector interactions of Rab proteins.

Main Methods:

Review of established and novel techniques for identifying small GTPase interacting proteins.
Analysis of literature on Rab protein regulation and effector interactions.
Focus on Rab-binding domains (RBDs) and their role in protein recruitment.

Main Results:

Small GTPases are crucial for diverse cellular processes.
Rab proteins function as membrane-associated switches controlling vesicular trafficking.
Regulatory proteins modulate Rab guanine nucleotide-binding status, and effectors interact via RBDs to mediate specific functions.

Conclusions:

Characterizing small GTPase interactomes provides insights into cellular signaling and disease.
Rab proteins and their regulatory/effector networks are vital for vesicular transport.
Further research into these interactions can reveal therapeutic targets for various diseases.