Q.26 - Biology

Question

Why is cAMP-mediated signal amplification not required in steroid hormone signaling? Describe how steroid signaling is amplified instead.

Step-by-Step Solution

Answer

• An enzyme termed adenylyl cyclase that's membrane-bound is sequentially activated by the active G-protein. 
• ATP is modified into cAMP through the action of adenylyl cyclase. 

Step 1: cAMP

• In turn, protein kinases are activated by cAMP, which causes them to transfer an ATP phosphate group to a substrate molecule in a very procedure called phosphorylation. 
• A substrate molecule's structural orientation is altered by phosphorylation, which activates it. 
• Changes in cellular functions can then be mediated by these activated molecules. 

Step 2: Adenylyl cyclase

• A hormone's impact is increased because the signalling pathway develops. 
• Adenylyl cyclase is activated when a hormone binds to 1 receptor and a number of other G-proteins are activated as a result. 
• The numerous molecules of cAMP are then produced as a results of each adenylyl cyclase molecule.