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Regulating the regulator: post-translational modification of RAS.

Ian M Ahearn1, Kevin Haigis, Dafna Bar-Sagi

  • 1NYU School of Medicine, 550 First Avenue, New York, NY 10016, USA.

Nature Reviews. Molecular Cell Biology
|December 23, 2011
PubMed
Summary

RAS proteins are molecular switches regulated by GEFs and GAPs. Post-translational modifications (PTMs) like farnesylation and palmitoylation further control RAS signaling by directing proteins to membranes and modulating activity.

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • RAS proteins function as crucial molecular switches in cellular signaling pathways.
  • Their activity is regulated by guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs).
  • Post-translational modifications (PTMs) play a significant role in modulating RAS protein function and localization.

Purpose of the Study:

  • To elucidate the diverse roles of post-translational modifications (PTMs) in RAS protein regulation.
  • To detail the specific PTMs affecting RAS proteins and their functional consequences.
  • To highlight how PTMs influence RAS localization and signaling.

Main Methods:

  • Review of existing literature on RAS protein modifications.
  • Analysis of biochemical pathways involved in RAS PTMs.
  • Examination of the structural and functional impacts of various PTMs on RAS.

Main Results:

  • RAS GTP-GDP exchange is modulated by GEFs and GAPs without covalent modification.
  • Key RAS PTMs include constitutive farnesylation, proteolysis, and methylation of the CAAX motif.
  • Reversible modifications like palmitoylation and conditional PTMs (phosphorylation, ubiquitylation, etc.) also impact RAS localization and activity.

Conclusions:

  • PTMs are critical for directing RAS proteins to specific cellular membranes.
  • These modifications can fine-tune RAS signaling by affecting GTP-GDP exchange.
  • A comprehensive understanding of RAS PTMs is essential for deciphering complex cellular processes.