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The Ras Gene

The Ras Gene

The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...

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:

GTPases and their Regulation

GTPases 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...

GTPases and their Regulation

GTPases 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...

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...

The Ras Gene

The Ras Gene

The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...

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Related Experiment Video

Updated: May 26, 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

The Interplay between ROS and Ras GTPases: Physiological and Pathological Implications.

Elisa Ferro¹, Luca Goitre, Saverio Francesco Retta

¹Department of Biotechnology, University of Siena, Via Fiorentina 1, 53100 Siena, Italy.

Journal of Signal Transduction

|December 17, 2011

Summary

Redox agents, including reactive oxygen and nitrogen species, regulate Ras GTPases, which are key to cell signaling. This interplay influences cellular processes and disease.

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Last Updated: May 26, 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

Examining the Dynamics of Cellular Adhesion and Spreading of Epithelial Cells on Fibronectin During Oxidative Stress

Examining the Dynamics of Cellular Adhesion and Spreading of Epithelial Cells on Fibronectin During Oxidative Stress

Published on: October 13, 2019

Area of Science:

Cellular Biology
Biochemistry
Signaling Networks

Background:

Ras GTPases are crucial for fundamental cellular processes, regulated by their guanine nucleotide-bound state.
Reactive oxygen species (ROS) and reactive nitrogen species (RNS) are increasingly recognized as signaling molecules, not just pathological agents.
Evidence suggests a complex interplay where Ras GTPases influence ROS production and oxidants act as effectors.

Purpose of the Study:

To review the current understanding of the mechanisms governing the interaction between GTPases and redox agents.
To discuss the physiopathological implications of this GTPase-redox signaling axis.

Main Methods:

Literature review and synthesis of existing research findings.
Discussion of proposed regulatory mechanisms and signaling pathways.

Main Results:

Redox agents can act as both upstream regulators and downstream effectors of Ras GTPases.
The interaction between GTPases and redox agents plays a role in various cell signaling pathways.
This interplay has significant implications for cellular function and disease pathogenesis.

Conclusions:

The bidirectional communication between Ras GTPases and redox agents is a critical aspect of cellular regulation.
Further research is needed to fully elucidate the complex mechanisms and therapeutic potential of targeting this signaling axis.