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- W1994831740 abstract "The gene encoding the rice transcription factor, REB (rice endosperm bZIP) was cloned from a bacterial artificial chromosome library of rice. The cloned 6,227-bp-long Reb gene is composed of six exons and five introns and is flanked by a 1.2-kb 5' promoter and a 1.2-kb 3' terminator region. The function of the Reb gene was explored by a transient assay by using a rice immature endosperm system. The effector constructs containing the native gene or fusion genes linking Reb to the rice actin (Act) or globulin (Glb) gene promoters and the reporter gene construct Glb-beta-glucuronidase (GUS) were used in this study. When these effector constructs were cotransferred with the reporter uidA gene encoding GUS under the control of the Glb promoter into immature rice endosperm cells, the Glb promoter was activated. The transient GUS expression was 2.0 to 2.5-fold higher with the effector construct than without. When the upstream activation sequence containing the GCCACGT(A/C)AG motifs of the Glb promoter was deleted, the activation by REB was abolished. On the other hand, a gain-of-function experiment showed that inserting the upstream activation sequence into the glutelin-1 (Gt1) promoter made it responsive to activation by REB. When cotransformed with Reb gene, mature transgenic rice grains containing the human lysozyme gene driven by the Glb promoter produced 3.7-fold more lysozyme. Accumulation of recombinant lysozyme in mature seed ranged from 30.57 to 279.61 microg.mg(-1) total soluble protein in individual transformants from 30 independent transformation events. Thus, our results show that REB is not only a transcriptional activator, it can also be used to increase the expression of recombinant protein in transgenic rice grains." @default.
- W1994831740 created "2016-06-24" @default.
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- W1994831740 date "2001-09-25" @default.
- W1994831740 modified "2023-10-18" @default.
- W1994831740 title "Expression of the REB transcriptional activator in rice grains improves the yield of recombinant proteins whose genes are controlled by a <i>Reb</i> -responsive promoter" @default.
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- W1994831740 doi "https://doi.org/10.1073/pnas.201411298" @default.
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