Consider this pathway: epinephrine →G protein-coupled receptor →G protein →adenylyl cyclase →cAM

step 1 This question asks us to identify the second messenger in a G -protein signaling pathway. We are

Consider this pathway: epinephrine →G protein-coupled...

Consider this pathway: epinephrine $\rightarrow$ G protein-coupled receptor $\rightarrow G$ protein $\rightarrow$ adenylyl cyclase $\rightarrow$ cAMP. Identify the second messenger. $$ \begin{array}{ll}{\text { (A) } \operatorname{cAMP}} & {\text { (C) GTP }} \\ {\text { (B) Grotein }} & {\text { (D) adenylyl cyclase }}\end{array} $$

Consider this pathway: epinephrine $\rightarrow$ G protein-coupled
receptor $\rightarrow G$ protein $\rightarrow$ adenylyl cyclase $\rightarrow$ cAMP.
Identify the second messenger.
$$
\begin{array}{ll}{\text { (A) } \operatorname{cAMP}} & {\text { (C) GTP }} \\ {\text { (B) Grotein }} & {\text { (D) adenylyl cyclase }}\end{array}
$$

Key Concepts

Second Messenger (cAMP)

Second messengers are small intracellular molecules that relay and amplify signals from receptors to target molecules within the cell. cAMP is a well-known second messenger that mediates various cellular responses by activating downstream protein kinases and other targets.

Adenylyl Cyclase

Adenylyl cyclase is an enzyme that catalyzes the conversion of ATP to cyclic AMP (cAMP). It is activated by G proteins in certain signal transduction pathways, thereby linking receptor activation to the production of key second messengers.

Signal Transduction

Signal transduction refers to the process by which cells respond to external signals through a series of molecular events. This process typically involves ligand binding to a receptor, activation of intracellular messengers, and the resulting cascade that amplifies the signal leading to a cellular response.

G Protein-Coupled Receptors (GPCRs)

GPCRs are a large class of cell surface receptors that detect external stimuli and initiate intracellular signaling pathways. Upon ligand binding, these receptors activate associated G proteins, which then propagate the signal to various downstream effectors.

G Proteins

G proteins function as molecular switches inside cells, transitioning between inactive and active states in response to receptor activation. They play a critical role in transmitting signals from GPCRs to other proteins such as enzymes involved in generating second messengers.

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