• protein
  • the source of the guanosine found in RNA and also involved in many cellular processes, including microtubule assembly, protein synthesis , and cell signaling, due to the energy it releases upon removal of its terminal phosphate group (yielding GDP). (factbites.com)
  • A guanosine 5-triphosphate (GTP)-dependent protein kinase was detected in preparations of outer chloroplast envelope membranes of pea (Pisum sativum L.) chloroplasts. (uni-muenchen.de)