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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.
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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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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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The Function of Embryonic Stem Cell-expressed RAS (E-RAS), a Unique RAS Family Member, Correlates with Its Additional

Saeideh Nakhaei-Rad1, Hossein Nakhaeizadeh1, Claus Kordes2

  • 1Institute of Biochemistry and Molecular Biology II, Hepatology, and Infectious Diseases, Medical Faculty of the Heinrich-Heine University, 40255 Düsseldorf.

The Journal of Biological Chemistry
|May 6, 2015
PubMed
Summary

Embryonic RAS (E-RAS) has a unique N-terminal extension crucial for its signaling. This E-RAS protein interacts differently with effectors compared to H-RAS, due to specific sequence variations.

Keywords:
E-RASH-RASRAS proteinRaf kinaseeffector selectionembryonic stem cell-expressed RASphosphatidylinositide 3-kinase (PI 3-kinase)phosphatidylinositol kinase (PI kinase)small GTPasespecificity determining residues

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Area of Science:

  • Molecular biology
  • Cellular signaling
  • Protein structure-function relationships

Background:

  • E-RAS is a RAS family member found in embryonic stem cells and certain tumors.
  • It possesses a unique N-terminal extension distinguishing it from classical RAS isoforms.
  • The functional significance of E-RAS's unique features remains largely unexplored.

Purpose of the Study:

  • To investigate the molecular mechanisms regulating E-RAS function.
  • To elucidate the role of E-RAS's unique sequence and structural features in its activity.
  • To compare E-RAS's effector interaction mode with that of H-RAS.

Main Methods:

  • Sequence and structural analysis of E-RAS.
  • Investigation of E-RAS signaling activity.
  • Comparative analysis of E-RAS and H-RAS effector interactions.

Main Results:

  • The N-terminal extension of E-RAS is essential for its signaling activity.
  • E-RAS exhibits a distinct effector interaction mode compared to H-RAS.
  • Sequence deviations in the effector-binding site, particularly tryptophan 79, influence E-RAS's effector selectivity.

Conclusions:

  • E-RAS's unique N-terminal region and effector interaction mode are key to its distinct biological roles.
  • Understanding E-RAS regulation provides insights into RAS protein diversity and function.
  • Tryptophan 79 is identified as a critical residue modulating RAS effector selectivity.