The second messenger cyclic AMP (CAMP) is synthesized from ATP by the activity of the enzyme adenylyl cyclase. Cyclic AMP, in turn, activates protein kinase A (PKA), also called cAMP-dependent protein kinase, which is responsible for most of the effects of CAMP within the cell. Determine the correct steps in the activation of PKA, and then place them in the correct order, starting after the adenylyl cyclase reaction. Cytosolic CAMP concentration increases. Two cAMP molecules bind to each PKA regulatory subunit. Each regulatory subunit is activated as the two CAMP molecules release. The regulatory subunits dissociate from the catalytic subunits. Answer Bank Cytosolic CAMP concentration decreases. The free catalytic subunits interact with proteins to phosphorylate Ser or Thr residues.

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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Question 8 // Last tutor worked on it and gave me this. But it was wrong. Please list the 4 correct ones in order as showed in picture. 

Solution
In the given flow chart for the activation of protein kinase enzyme, the steps are in the correct order as
follows.
1. In the cell, the cytosolic concentration of CAMP increases.
2. Two of the CAMP molecules are required to bind to each of the PKA regulatory subunits.
3. Each regulatory subunit is activated as the two CAMP molecules release.
4. The regulatory subunit dissociates from the catalytic subunit.
5. The free catalytic subunit interacts with proteins to phosphorylate Ser or Thr residues.
6. Cytosolic CAMP concentration decreases.
Transcribed Image Text:Solution In the given flow chart for the activation of protein kinase enzyme, the steps are in the correct order as follows. 1. In the cell, the cytosolic concentration of CAMP increases. 2. Two of the CAMP molecules are required to bind to each of the PKA regulatory subunits. 3. Each regulatory subunit is activated as the two CAMP molecules release. 4. The regulatory subunit dissociates from the catalytic subunit. 5. The free catalytic subunit interacts with proteins to phosphorylate Ser or Thr residues. 6. Cytosolic CAMP concentration decreases.
The second messenger cyclic AMP (CAMP) is synthesized from ATP by the activity of the enzyme adenylyl cyclase. Cyclic
AMP, in turn, activates protein kinase A (PKA), also called cAMP-dependent protein kinase, which is responsible for most of
the effects of CAMP within the cell.
Determine the correct steps in the activation of PKA, and then place them in the correct order, starting after the adenylyl
cyclase reaction.
Incorrect
Cytosolic CAMP concentration increases.
Two cAMP molecules bind to each PKA
regulatory subunit.
Each regulatory subunit is activated as the two
CAMP molecules release.
The regulatory subunits dissociate from the
catalytic subunits.
Answer Bank
Cytosolic cAMP concentration decreases.
The free catalytic subunits interact with
proteins to phosphorylate Ser or Thr residues.
Transcribed Image Text:The second messenger cyclic AMP (CAMP) is synthesized from ATP by the activity of the enzyme adenylyl cyclase. Cyclic AMP, in turn, activates protein kinase A (PKA), also called cAMP-dependent protein kinase, which is responsible for most of the effects of CAMP within the cell. Determine the correct steps in the activation of PKA, and then place them in the correct order, starting after the adenylyl cyclase reaction. Incorrect Cytosolic CAMP concentration increases. Two cAMP molecules bind to each PKA regulatory subunit. Each regulatory subunit is activated as the two CAMP molecules release. The regulatory subunits dissociate from the catalytic subunits. Answer Bank Cytosolic cAMP concentration decreases. The free catalytic subunits interact with proteins to phosphorylate Ser or Thr residues.
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