Final answer:
Rab GTPase and SNARE proteins are used during protein trafficking in the endomembrane system. They help in the sorting, transport, and fusion of vesicles to ensure accurate delivery of proteins to their final destinations within the cell.
Step-by-step explanation:
Rab GTPase and SNARE proteins are used during protein trafficking in the endomembrane system. Rab GTPase proteins are involved in the regulation of vesicle formation and movement, while SNARE proteins are responsible for the fusion of vesicles with their target membranes.
For example, in the Golgi apparatus, Rab GTPases help in the sorting and transport of cargo proteins from the trans Golgi stack to different cellular or extracellular destinations. V-SNARE proteins on budding vesicles bind to complementary T-SNARE proteins on receiving membranes, leading to vesicle fusion.
Overall, Rab GTPase and SNARE proteins play crucial roles in the accurate delivery of proteins to their final destinations within the cell.