You are studying a cell line that expresses both GPCR-A and GPCR-B, each receptor binds the same ligand but activates different heterotrimeric G proteins that act on adenylyl cyclase. GPCR-A causes an increase in adenylyl cyclase activity, while GPCR-B causes an decrease in adenylyl cyclase activity. There is a basal level of adenylyl cyclase activity that produces a baseline CAMP concentration. Which of the following mutations would decrease the intracellular levels of CAMP upon ligand addition? Select all that apply. A mutation in Gi that prevents release of bound GDP A mutation in GPCR-B that prevents G protein activation A mutation in GPCR-A that prevents G protein activation A mutation in Gs that prevents release of bound GDP

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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You are studying a cell line that expresses both GPCR-A and GPCR-B, each receptor
binds the same ligand but activates different heterotrimeric G proteins that act on
adenylyl cyclase.
GPCR-A causes an increase in adenylyl cyclase activity, while GPCR-B causes an
decrease in adenylyl cyclase activity.
There is a basal level of adenylyl cyclase activity that produces a baseline CAMP
concentration.
Which of the following mutations would decrease the intracellular levels of cAMP
upon ligand addition?
Select all that apply.
A mutation in Gi that prevents release of bound GDP
A mutation in GPCR-B that prevents G protein activation
A mutation in GPCR-A that prevents G protein activation
A mutation in Gs that prevents release of bound GDP
Transcribed Image Text:You are studying a cell line that expresses both GPCR-A and GPCR-B, each receptor binds the same ligand but activates different heterotrimeric G proteins that act on adenylyl cyclase. GPCR-A causes an increase in adenylyl cyclase activity, while GPCR-B causes an decrease in adenylyl cyclase activity. There is a basal level of adenylyl cyclase activity that produces a baseline CAMP concentration. Which of the following mutations would decrease the intracellular levels of cAMP upon ligand addition? Select all that apply. A mutation in Gi that prevents release of bound GDP A mutation in GPCR-B that prevents G protein activation A mutation in GPCR-A that prevents G protein activation A mutation in Gs that prevents release of bound GDP
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