Mutations in the RAS gene, particularly in the H-RAS and K-RAS isoforms, are commonly found in various types of cancer. What is the primary function of the RAS protein in normal cells?
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One of the most studied proteins is Ras: What is the normal cellular role of Ras? Is Ras considered a proto-oncogene or a tumor suppressor gene? Explain why. Describe the specific type of mutation in Ras that is frequently found in cancer cells. Explain how this type of mutation affects the activity of Ras.
Sri K.
In what way does the Ras oncogene contribute to cancers? Ras codes for GTPase, which in its mutated form cannot be switched off. Ras codes for a transcription factor, which is produced in abnormally large amounts. Ras codes for an unusual fusion protein that behaves like a constitutively activated growth factor receptor. Ras codes for a truncated form of a growth factor receptor, which is continuously active. Ras codes for a tumor suppressor protein, which is produced in abnormally large amounts.
Madhur L.
The Ras protein functions as a molecular switch that is set to its "on" state by other proteins that cause it to expel its bound GDP and bind GTP. A GTPase-activating protein helps reset the switch to the "off" state by inducing Ras to hydrolyze its bound GTP to GDP much more rapidly than it would without this encouragement. Thus, Ras works like a light switch that one person turns on and another turns off. You are given a mutant cell that lacks the GTPase-activating protein. What abnormalities would you expect to find in the way in which Ras activity responds to extracellular signals?
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