15. Cell signalling and signal transduction (III)

Question 1

Enzyme-coupled receptors

Answer 1

• Inactive catalytic domain
• signal molecule in form of a dimer
• active catalytic domain
• signal molecule
• activated associated enzyme

Question 2

Enzyme-coupled cell surface receptors

Answer 2

• only one transmembrane domain

- cytosolic domain either has enzyme activity or associates directly with an enzyme