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Small GTPases - Ras and Rho

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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.
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Activation and Inactivation of G Proteins

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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...

GTPases and their Regulation

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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.
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GTPases and their Regulation

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Related Experiment Video

Updated: May 18, 2026

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

Published on: November 11, 2018

Rho GTPases in pulmonary vascular dysfunction.

Elisabeth M Storck¹, Beata Wojciak-Stothard

¹Centre for Pharmacology and Therapeutics, Imperial College London, UK.

Vascular Pharmacology

|September 18, 2012

Summary

Rho GTPases regulate vascular functions and are implicated in pulmonary vascular diseases. This review overviews their role in conditions like pulmonary hypertension and acute lung injury.

Area of Science:

Biochemistry and Molecular Biology
Cell Biology
Physiology

Background:

Rho proteins are key regulators of actin dynamics.
They control critical vascular cell functions including migration, proliferation, and survival.
Dysregulation of Rho GTPases is linked to various pulmonary vascular diseases.

Purpose of the Study:

To provide an overview of the current knowledge on Rho GTPases in vascular dysfunction.
To explore the role of Rho GTPases in specific pulmonary diseases.

Main Methods:

Literature review and synthesis of existing research.
Focus on the molecular mechanisms of Rho GTPase signaling in vascular cells.
Analysis of their involvement in pathological conditions.

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Last Updated: May 18, 2026

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

Published on: November 11, 2018

Right Ventricular Systolic Pressure Measurements in Combination with Harvest of Lung and Immune Tissue Samples in Mice

Right Ventricular Systolic Pressure Measurements in Combination with Harvest of Lung and Immune Tissue Samples in Mice

Published on: January 16, 2013

Isolation of Pulmonary Artery Smooth Muscle Cells from Neonatal Mice

Isolation of Pulmonary Artery Smooth Muscle Cells from Neonatal Mice

Published on: October 19, 2013

Main Results:

Rho GTPases influence multiple cellular processes essential for vascular health.
Evidence links their aberrant activity to the pathogenesis of pulmonary hypertension, embolism, COPD, ALI, and ARDS.
Specific pathways and downstream effects are detailed.

Conclusions:

Rho GTPases are critical mediators of vascular cell behavior.
Their dysregulation represents a significant factor in the development and progression of pulmonary vascular diseases.
Targeting Rho GTPase pathways may offer therapeutic strategies for these conditions.