214 Chapter 4. Structure and functions of biological membranes. Cell signaling pathways Table 4.1. Adenylyl cyclase and phosphatidylinositol 4',5'-bisphosphate (PIP,) signaling pathways Structure and Function Adenylyl cyclase system Ihosital phosphate An example of the primary messenger system Integral membrane protein, complementary binding the primary messenger primary Protein, activating the enzyme of the signaling system System enzyme, forming the secondary messenger(s) мвенный cumem Secondary messenger(s) of the system Cytosolic enzyme(s), interacting with the secondary messenger Regulatory mechanisms (specific to the system) of the metabolic enzyme activity Mechanisms of the secondary messenger's concentration decrease in the targeted cell The cause of the membrane enzyme activity decrease (specific to the system)

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