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| Content Provider | Springer Nature Link |
|---|---|
| Author | Takaiwa, Fumio Yang, Lijun Maruyama, buyuki Wakasa, Yuhya Ozawa, Kenjiro |
| Copyright Year | 2016 |
| Abstract | Mouse TGF-β highly accumulated by expressing as a secretory homodimeric protein in transgenic rice endosperm. It was tightly deposited in ER-derived PBs by interaction with cysteine-rich prolamins. TGF-β is one of the key players involved in the induction and maintenance of mucosal immune tolerance to dietary proteins through the induction of regulatory T cells. In order to utilize rice-based TGF-β as a tool to promote oral immune tolerance induction, high production of TGF-β is essentially required. When the codon-optimized mTGF-β was expressed as a secretory protein by ligating an N-terminal signal peptide and C-terminal KDEL ER retention signal under the control of the endosperm-specific rice storage protein glutelin GluB-1 promoter, accumulation level was low in stable transgenic rice seeds. Then, to increase the accumulation level of mTGF-β, it was expressed as fusion proteins by inserting into the C terminus of acidic subunit of glutelin GluA and the variable region of 26 kDa globulin. When fused with the glutelin, it could accumulate well as visible bands by CBB staining gel, but not for the 26 kDa globulin. Unexpectedly, expression of homodimeric mTGF-β linked by a 6×Gly1×Ser linker as secretory protein resulted in higher level of accumulation. This expression level was further enhanced by reduction of some endogenous prolamins by RNA interference. The monomeric and dimeric mTGF-βs were deposited in ER-derived PBs containing prolamins. When highly produced in rice seed, it is notable that most of ER-derived PBs were distorted and granulated. Step-wise extraction of storage proteins from rice seeds suggested that the mTGF-β strongly interacted with cysteine-rich prolamins via disulfide bonds. This result was also supported by the finding that reducing agent was absolutely required for mTGF-β extraction. |
| Starting Page | 2461 |
| Ending Page | 2473 |
| Page Count | 13 |
| File Format | |
| ISSN | 07217714 |
| Journal | Plant Cell Reports |
| Volume Number | 35 |
| Issue Number | 12 |
| e-ISSN | 1432203X |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2016-08-31 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Endosperm ER stress Prolamin Protein body Seed storage protein Transgenic rice TGF-β Plant Sciences Cell Biology Biotechnology Plant Biochemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Medicine Agronomy and Crop Science |
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