Related Experiment Video
Updated: May 16, 2026
13:51
Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
Published on: November 11, 2018
Rho family GTPases
1Memorial Sloan-Kettering Cancer Center, Cell Biology Program, 1275 York Avenue, New York, NY 10065, USA. halla@mskcc.org
Biochemical Society Transactions
|November 27, 2012
Summary
Rho GTPases are molecular switches crucial for cell functions like actin cytoskeleton regulation. Their dysregulation is linked to various human diseases, highlighting their importance in cellular signaling and health.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Rho GTPases function as molecular switches regulating eukaryotic cellular signal transduction.
- Their activity is modulated by GTP binding, which facilitates interactions with effector proteins.
- A conserved role across species is the regulation of the actin cytoskeleton.
Purpose of the Study:
- To elucidate the fundamental role of Rho GTPases in cellular processes.
- To highlight the conserved functions of Rho GTPases from yeast to humans.
- To underscore the link between Rho GTPase dysregulation and human diseases.
Main Methods:
- This study is a review of existing literature on Rho GTPase function.
- Key findings are synthesized from studies across various model organisms.
- The focus is on conserved molecular mechanisms and cellular outcomes.
Main Results:
- Rho GTPases control diverse cellular activities beyond actin cytoskeleton regulation.
- Actin cytoskeleton dynamics, governed by Rho GTPases, are essential for cell morphogenesis, migration, phagocytosis, and cytokinesis.
- Dysregulation of Rho GTPase signaling is implicated in numerous human pathologies.
Conclusions:
- Rho GTPases are critical regulators of fundamental cellular processes.
- Their conserved role in actin dynamics is vital for cell behavior.
- Understanding Rho GTPase function and dysfunction is key for addressing associated human diseases.
Related Concept Videos
01:24Small 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:
Three regulatory proteins control their activity:
01:22Activation and Inactivation of G Proteins
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
02:14GTPases and their Regulation
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins, also known...
Large G-proteins, also known...
02:14GTPases and their Regulation
Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒ small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins, also known...
Large G-proteins, also known...
01:14Rab 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 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...
01:25Rab 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.