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[Ras p21 and signal transduction]
Abstract:
It is known that ras gene was discovered as a transforming gene of rat sarcoma virus. This gene is conserved ubiquitously from yeast to human, and a dominant activating mutation of ras results in transformation in mammalian cells. Currently it is evident that ras gene regulates cell proliferation and differentiation. The gene product, ras p21, binds to GDP or GTP, and hydrolyzes GTP to GDP and Pi. The GTP-bound form is in active conformation which transmits signals to a downstream target. In this review, we focus on how the activity of ras p21 is regulated and on the mode of action of ras p21 in cell proliferation and differentiation.
Insights
The ras gene, crucial for cell growth and development, regulates cell proliferation and differentiation. This review explores how ras p21 activity is controlled and its signaling mechanisms in cellular processes.
Area of Science:
- Molecular Biology
- Cellular Signaling
- Oncogenes
Context:
- The ras gene, identified from rat sarcoma virus, is highly conserved across species.
- Activating mutations in ras genes drive mammalian cell transformation.
- Ras proteins are key regulators of fundamental cellular processes.
Purpose:
- To review the regulatory mechanisms controlling ras p21 activity.
- To elucidate the functional role of ras p21 in cell proliferation and differentiation.
- To detail the signal transduction pathways involving ras proteins.
Summary:
- Ras proteins, like ras p21, bind GTP and hydrolyze it to GDP, acting as molecular switches.
- The GTP-bound, active conformation of ras p21 initiates downstream signaling cascades.
- This review focuses on the regulation of ras p21 activity and its impact on cell growth and differentiation.
Impact:
- Understanding ras p21 regulation is vital for comprehending cell cycle control.
- Insights into ras signaling pathways can inform cancer research and therapeutic strategies.
- This review provides a comprehensive overview of ras gene function in normal and transformed cells.