Cells terminate their response to signals through several mechanisms involving G proteins. One key mechanism is the hydrolysis of GTP to GDP on the Gα subunit, leading to its inactivation and dissociation from the effector protein. Additionally, regulatory proteins like RGS (Regulator of G protein Signaling) can accelerate this process. To maintain the ability to respond to new signals, cells can recycle and re-sensitize G protein-coupled receptors (GPCRs) via processes such as receptor phosphorylation and internalization, allowing them to be ready for subsequent signaling events.
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