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Related Experiment Videos

Visualizing Ras signalling in real-time.

Simon A Walker1, Peter J Lockyer

  • 1Laboratory of Molecular Signalling, The Babraham Institute, Babraham Research Campus, Babraham, Cambridge, CB2 4AT, UK.

Journal of Cell Science
|June 16, 2004
PubMed
Summary
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Ras GTPases, crucial for cell signaling, are now known to be active not just on the plasma membrane but also on internal organelles like the Golgi. This discovery opens new questions about the significance of Ras signaling from these distinct cellular compartments.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Ras GTPases function as molecular switches regulating signal transduction.
  • Lipid modifications anchor Ras proteins to membranes, influencing their localization and dynamics.
  • The plasma membrane has historically been viewed as the primary site of Ras activity.

Purpose of the Study:

  • To investigate the spatial and temporal regulation of Ras activity beyond the plasma membrane.
  • To explore the functional significance of Ras signaling from intracellular organelles.
  • To reconcile differing observations on Ras activity based on experimental methodologies.

Main Methods:

  • Live-cell imaging techniques.
  • Development and application of novel probes for Ras activity visualization.

Related Experiment Videos

  • Analysis of Ras activation kinetics in different cellular compartments.

    • Main Results:

    • Ras GTPase activity was detected on intracellular organelles, including the Golgi apparatus.
    • Ras activation on the Golgi exhibits distinct kinetics compared to the plasma membrane.
    • Compartmentalized Ras signaling appears particularly significant in specific cell types like lymphocytes.

    Conclusions:

    • Ras GTPases can signal from intracellular compartments, challenging the long-held view of plasma membrane exclusivity.
    • The functional implications of Ras signaling from organelles like the Golgi warrant further investigation.
    • Understanding Ras compartmentalization is key to deciphering its role in endogenous signaling pathways.