Tags: Protein.
Rap1 (Ras-proximate-1 or Ras-related protein 1) is a small GTPase which are small cytosolic proteins that act like cellular switches and are vital for effective signal transduction. There are two isoforms of the Rap1 protein each encoded by a separate gene RAP1A and RAP1B. Rap1 belongs to Ras-related protein family. GTPases are inactive when in their GDP-bound form and become active when they bind to GTP.