Notes on Single Transduction Pathways

Overview of Signal Transduction Pathways

• Topic 4.3: Single Transduction Pathways
• Focus: How changes in signaling molecule structure affect activity and predict effects based on models.

Key Concepts

• Mutations in Receptor Proteins:

  • Changes in receptor proteins can disrupt signal transduction.
  • Mutated receptors can no longer bind signaling molecules, halting pathway activation.

• Effect of Chemicals:

  • Chemicals can activate or inhibit signaling pathways.
  • Activation example: Fibroblast growth factor (FGF) leads to conformational changes in proteins, activating the pathway.
  • Inhibition example: Blocking neurotransmitter release prevents communication with target cells.

Insulin Signaling Pathway

• Role of Insulin Receptor:

  • Transmembrane protein regulating glucose homeostasis.
  • Binding of insulin stimulates transduction pathway, resulting in GLUT4 translocation for glucose transport.

• Loss of Function Prediction:

  • Loss of function in the insulin receptor's intracellular domain can disrupt pathway and glucose uptake.

Key Takeaways

• Mutations: Altered ligand-receptor specificity can lead to inactive signaling pathways.
• Activation & Amplification: Proper signaling results in pathway amplification.
• Inhibition: Interference prevents signaling pathways from occurring effectively.