Rab family GTPase%3B involved in the ER-to-Golgi step of the secretory pathway%3B complex formation with the Rab escort protein Mrs6p is required for prenylation of Ypt1p by type II protein geranylgeranyltransferase (Bet2p-Bet4p)%3B binds to unspliced HAC1 mRNA%3B regulates the unfolded protein response (UPR) by promoting the decay of HAC1 RNA%3B localizes to the early Golgi%2C the transitional Golgi and ER membranes%2C pre-autophagosomal structures%2C and cytoplasmic vesicles