A. Activation of protein kinase A
B. ATP to Cyclic AMP
C. Release of calcium ion
D. Muscle contraction
Choose the correct answer from the options given below:
G Protein Receptor Activation Sequence
G Protein-coupled receptors (GPCRs) initiate intracellular signaling cascades upon activation. The specific sequence depends on the type of G protein and downstream effectors involved.
Signal Cascade Steps
Based on the typical pathway involving Gs activation:
- ATP to Cyclic AMP (cAMP) Conversion: Activated GPCRs stimulate the enzyme adenylyl cyclase. Adenylyl cyclase catalyzes the conversion of ATP (adenosine triphosphate) into cyclic AMP (cAMP), a crucial second messenger. This corresponds to option B.
- Protein Kinase A (PKA) Activation: The generated cAMP binds to the regulatory subunits of Protein Kinase A (PKA), causing the release and activation of its catalytic subunits. This is option A.
- Calcium Ion Release: Activated PKA can phosphorylate various target proteins. In certain cell types, this phosphorylation can lead to the release of stored calcium ions (Ca2+) from intracellular stores like the endoplasmic reticulum. This corresponds to option C.
- Muscle Contraction: Increased intracellular calcium levels are a key trigger for muscle contraction by enabling the interaction of actin and myosin filaments. This represents option D.
Therefore, the correct sequence following G Protein receptor activation in this context is ATP to Cyclic AMP, Activation of Protein Kinase A, Release of calcium ion, and Muscle contraction (B, A, C, D).
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