Abstract
Key message
Specific domain of the Mal d 1 was identified to be mainly involved in higher accumulation level in vegetative tissues of transgenic rice than the Bet v 1.
Abstract
Apple food allergen Mal d 1 and birch pollen allergen Bet v 1 belong to the same pathogen related protein 10 (PR10) family. When green fluorescent protein (GFP) fused to either of these allergens was expressed as a secretory protein in transgenic rice by ligating an N terminal signal peptide and a C terminal KDEL ER retention signal under the control of the maize ubiquitin constitutive promoter, the GFP:Mald1 highly accumulated in various tissues, whereas accumulation level of the GFP:Betv1 was remarkably reduced in vegetative tissues except for seed. Analysis by RT-PCR exhibited that there was little difference in their transcript levels, indicating the involvement of post-transcriptional regulation. To investigate the cause of such difference in accumulation levels, deletion analysis of the Mal d 1 and domain swapping between them were carried out in transgenic rice. The results showed that the region between positions 41–90 in the Mal d 1 is predominantly implicated in higher level accumulation in vegetative tissues as well as seed as compared with the Bet v 1. The GFP:Mald1 was localized in oligomeric form within ER lumen or ER-derived particles in vegetative tissues, whereas in seed mainly deposited into novel huge ER-derived protein bodies with the size of 5–10 µm in aleurone cells.
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Abbreviations
- Cys:
-
Cysteine
- BiP:
-
Binding protein
- DTT:
-
Dithiothreitol
- ER:
-
Endoplasmic reticulum
- ELP:
-
Elastin-like polypeptide
- GFP:
-
Green fluorescence protein
- OAS:
-
Oral allergy syndrome
- PB:
-
Protein body
- 2-MER:
-
2-Mercaptoethanol
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- RT-PCR:
-
Reverse transcription-polymerase chain reactions
- PR10:
-
Pathogen related protein 10
- PDIL:
-
Protein disulfide isomerase like
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Acknowledgements
We thank Ms. K. Miyashita, Y. Ikemoto and H. Yajima for technical assistance and Dr. Kenjirou Ozawa for encourage of this research.
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FT carried out the experimental design, data analysis and wrote the manuscript. YO and YW participated in experiments and contributed the data analysis.
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Takaiwa, F., Ogo, Y. & Wakasa, Y. Specific region affects the difference in accumulation levels between apple food allergen Mal d 1 and birch pollen allergen Bet v 1 which are expressed in vegetative tissues of transgenic rice. Plant Mol Biol 98, 439–454 (2018). https://doi.org/10.1007/s11103-018-0789-7
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DOI: https://doi.org/10.1007/s11103-018-0789-7