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Related Concept Videos

The Ras Gene02:38

The Ras Gene

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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...
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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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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
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Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
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Updated: Mar 23, 2026

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells
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Plasma membrane regulates Ras signaling networks.

Tanmay Sanjeev Chavan1, Serena Muratcioglu2, Richard Marszalek3

  • 1Department of Medicinal Chemistry; University of Illinois at Chicago ; Chicago, IL USA.

Cellular Logistics
|April 8, 2016
PubMed
Summary

The plasma membrane is crucial for Ras signaling diversity, regulating essential cell functions like proliferation and survival. Membrane interactions guide Ras protein localization, conformation, and oligomerization, optimizing isoform function.

Keywords:
Ras GTPasesRas oligomerizationRas signalinglipid raftsmembrane microdomainsplasma membrane

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Ras GTPases are key regulators of cellular functions, including proliferation, survival, and migration, through over 20 distinct signaling pathways.
  • The precise mechanisms by which Ras proteins achieve their diverse signaling outputs remain incompletely understood.
  • Emerging evidence points to the critical role of the plasma membrane in modulating Ras activity and signaling specificity.

Approach:

  • Investigating the multifaceted roles of the plasma membrane in Ras signaling.
  • Analyzing the impact of membrane localization, induced conformational changes, and oligomerization on Ras function.
  • Examining the sequence variability in Ras membrane-targeting domains to infer functional importance.

Key Points:

  • The plasma membrane facilitates Ras signaling by selectively recruiting Ras and its effectors to specific membrane microdomains.
  • Membrane-induced conformational alterations in Ras proteins contribute significantly to their functional diversity.
  • Oligomerization of membrane-bound Ras is essential for the recruitment and activation of downstream effectors like Raf.

Conclusions:

  • The plasma membrane is not merely a scaffold but an active regulator of Ras signaling pathways.
  • Membrane localization, local environment, and orientation are critical determinants of Ras isoform function.
  • Understanding membrane-Ras interactions is key to deciphering Ras-driven cellular processes and diseases.