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Explain how we can visualize cAMP in cells using FRET (2 pts) Please no cursive handwriting,...

Explain how we can visualize cAMP in cells using FRET (2 pts)

Please no cursive handwriting, I can't read cursive.

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Answer #1

The FRET-based cAMP indicator includes two major components :

  • a cAMP sensor, and
  • a chromophore donor and acceptor fused to the cAMP sensor.

Changes in conformation, or distance between the interacting protein partners, influence the distance or orientation of the two fluorophores and thus the energy transfer efficiency. The real-time cAMP imaging is based on fluorescein-labeled PKA-C and rhodamine-labeled PKA-R subunits, which have been microinjected into cells. Within a resting cell, FRET occurs between the two fluorophores under low cAMP conditions, while an increase within cAMP concentration is associated with a decrease in FRET due to dissociation of PKA subunits.

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