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Rice prolamin species form a layered structure in the protein body type I (PB-I) storage organelle. Rice prolamins are classified as 10 kDa, 13a-1, 13a-2, 13b-1, 13b-2 and 16 kDa prolamin. Prolamin species form layer structure in PB-I in order of 10 kDa core, 13b-1 layer, 13a (13a-1 and 13a-2) and 16 kDa middle layer and 13b-2 outer-most layer. In a previous study, we showed that the fusion proteins in 13b-2 prolamin-GFP, 13a-1 prolamin-GFP and 10 kDa prolamin-GFP were localized in the same layer of PB-I as the native prolamin, when they were expressed by their respective native prolamin promoters. Our preliminary study suggested that the temporal control of the native prolamin promoters was responsible for the localization of the respective prolamins. The aim of this study was to determine whether the use of a prolamin promoter other than the native prolamin promoter would change the localization of prolamin-GFP fusion proteins. For this purpose, we generated transgenic lines expressing 13b-2 prolamin-GFP and 13a-1 prolamin-GFP fusion proteins driven by each prolamin promoter other than the native prolamin promoter. As a result, the localization of the fusion protein in PB-I was changed. Based on our results, foreign protein localization in PB-I can be achieved by the temporal control of the different prolamin promoters.

plant biotechnology

The localization of rice prolamin species in protein body type I is determined by the temporal control of gene expression of the respective prolamin promoters