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[Regulation of a small GTPase Rap2]
1Laboratory of Molecular and Cellular Pathology, Department of Neurological Disorder, Division of Neurological Science, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan.
[Hokkaido Igaku Zasshi] the Hokkaido Journal of Medical Science
|March 10, 2001
Summary
Rap2, a Ras-family protein, shares regulatory factors and cellular localization with Rap1. It suppresses Ras-mediated ERK/MAP kinase activation by inhibiting the Elk1 transcription factor.
Area of Science:
- Molecular Biology
- Cell Signaling
- Ras GTPases
Context:
- Rap2 is a Ras-family GTPase with poorly understood regulation and function.
- Comparison with the well-studied Rap1 provides insights into Rap2's biological role.
Purpose:
- To investigate and compare the regulation and function of Rap2 with Rap1.
- To elucidate Rap2's molecular mechanisms and cellular activities.
Summary:
- Rap2 is regulated by the same guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs) as Rap1.
- Rap2 localizes to both plasma and intracellular membranes.
- Rap2 binds to Raf, inhibiting Ras-dependent Elk1 activation, with over 50% of Rap2 in the GTP-bound state.
Impact:
- Rap2 suppresses Ras-mediated ERK/MAP kinase activation in quiescent cells.
- This study clarifies Rap2's role in cellular signaling pathways.
- Findings contribute to understanding Ras GTPase family regulation and function.