G-Proteins

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4 Terms

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What are G-proteins made of?

Three subunits — alpha (α), beta (β), and gamma (γ).

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What happens when G-protein is activated?

The alpha subunit (bound to GTP) separates from the beta and gamma subunits to activate or inhibit target enzymes or ion channels.

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How is the G-protein turned off?

The alpha subunit hydrolyzes GTP back to GDP, stopping the signal and reuniting with the beta and gamma subunits.

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