Question

Sequencing of a Signal Transduction Pathway: Put the following steps of the epinephrine receptor signaling pathway in the correct sequence. The epinephrine receptor is a member of the G-protein coupled receptor (GPCR) family. 1. The $\alpha$ subunit dissociates from the $\beta\gamma$ dimer 2. cAMP is produced 3. The $\alpha$ subunit exchanges a new GTP for its GDP, thereby being activated 4. cAMP binds to and activates Protein Kinase A (PKA) 5. Phosphodiesterase (PDE) converts cAMP to AMP, inactivating it. 6. The activated receptor binds to a G protein within the cell 7. Adenylyl cyclase is bound by the $\alpha$ subunit and activated 8. Epinephrine binds to the extracellular domain of its receptor and activates it. 9. Activated PKA phosphorylates target enzymes involved with glycogen metabolism 10. The $\alpha$ subunit hydrolyzes GTP into GDP + P$_i$, and associates with the $\beta\gamma$ dimer 1st ___ $\to$ 2nd _ $\to$ 3rd _ $\to$ 4th _ $\to$ 5th _ 6th _ $\to$ 7th _ $\to$ 8th _ $\to$ 9th _ $\to$ 10th ___ What are the two primary advantages of signaling via a second messenger such as cAMP? List and explain each. 1. Signal Amplification-where a single extracellular signal can trigger a 2. The ability to integrate multiple signals from diff. pathways within the cell large intracellular resp.

          Sequencing of a Signal Transduction Pathway:
Put the following steps of the epinephrine receptor signaling pathway in the correct sequence. The epinephrine receptor is a member of the G-protein coupled receptor (GPCR) family.
1. The $\alpha$ subunit dissociates from the $\beta\gamma$ dimer
2. cAMP is produced
3. The $\alpha$ subunit exchanges a new GTP for its GDP, thereby being activated
4. cAMP binds to and activates Protein Kinase A (PKA)
5. Phosphodiesterase (PDE) converts cAMP to AMP, inactivating it.
6. The activated receptor binds to a G protein within the cell
7. Adenylyl cyclase is bound by the $\alpha$ subunit and activated
8. Epinephrine binds to the extracellular domain of its receptor and activates it.
9. Activated PKA phosphorylates target enzymes involved with glycogen metabolism
10. The $\alpha$ subunit hydrolyzes GTP into GDP + P$_i$, and associates with the $\beta\gamma$ dimer
1st _______ $\to$ 2nd _______ $\to$ 3rd _______ $\to$ 4th _______ $\to$ 5th _______
6th _______ $\to$ 7th _______ $\to$ 8th _______ $\to$ 9th _______ $\to$ 10th _______
What are the two primary advantages of signaling via a second messenger such as cAMP? List and explain each.
1. Signal Amplification-where a single extracellular signal can trigger a
2. The ability to integrate multiple signals from
diff. pathways within the cell large intracellular resp.

sequencing of a signal transduction pathway put the following steps of the epinephrine receptor signaling pathway in the correct sequence the epinephrine receptor is a member of the g protei 61413

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