Fig. 3
From: Comparison and contrast of plant, yeast, and mammalian ER stress and UPR
A schematic illustration of the unfolded protein response in plants. IRE1 splices 23 nucleotides in bZIP60 mRNA in the plant UPR. bZIP28 and bZIP17 are activated in the Golgi by S1P and S2P. The N-terminal domains of bZIP28 and bZIP17 are translocated to the nucleus, where bZIP28, together with NF-Y, induces the expression of UPR genes. The function of bZIP17 in the UPR is not clear. No homolog of PERK has been identified in plants