Phosphorylation in Receptor Tyrosine Kinases

Phosphorylation in Receptor Tyrosine Kinases

• Dimerization of Receptors

  • Phosphorylation occurs between two receptor tyrosine kinases that have dimerized (formed a dimer).
  • Each receptor phosphorylates the other, leading to a cascade of cellular events.

• Phosphate Groups and Protein Structure

  • The addition of phosphate groups to the tyrosine residues changes the conformational shape of the protein.
  • This shape change is crucial for the functionality of the protein because it enables interaction with different binding partners.

• Binding of Relay Proteins

  • The phosphorylated version of the protein is now capable of binding to specific relay proteins.
  • The binding of relay proteins marks the initiation of signal transduction processes within the cell.

• Signal Transduction and Cellular Response

  • Once relay proteins are activated, they trigger a chain of reactions that lead to the cellular response.
  • This process plays a fundamental role in various cellular functions, including growth, differentiation, and metabolism.

• Q&A Segment

  • After explaining the above concepts, the instructor checks for understanding by asking if there are any questions regarding receptor tyrosine kinases and the phosphorylation process.

• Transition to Break

  • The instructor decides to take a break before proceeding to a more detailed discussion on signal transduction mechanisms.