Dicistronic expression of human proinsulin-protein A fusion in tobacco chloroplast
| Autor: | Maryam Nikkhah, Melina Yarbakht, Mehdi Mohebodini, Mokhtar Jalali-Javaran |
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| Rok vydání: | 2014 |
| Předmět: |
Homoplasmy
Process Chemistry and Technology Biomedical Engineering food and beverages Bioengineering General Medicine Biology Applied Microbiology and Biotechnology Molecular biology Drug Discovery Gene expression biology.protein Molecular Medicine Plastid Protein A Gene Biotechnology Transplastomic plant Southern blot Proinsulin |
| Zdroj: | Biotechnology and Applied Biochemistry. 62:55-63 |
| ISSN: | 0885-4513 |
| Popis: | Different expression systems such as bacteria and mammalian cells have been used to produce pharmaceutical proteins. In recent years, the use of plants as bioreactors offers efficient and economical systems in recombinant protein production. Furthermore, because of the large number of plastid copies in plants, chloroplast engineering functions as an effective method to increase recombinant protein expression. Because the commercially available insulin for treatment does not contain C-peptide, which is of great importance for type 1 diabetic patients, the current study introduces the human proinsulin gene fused with protein A into the tobacco chloroplast genome using the biolistic method. To achieve homoplasmy, three rounds of selection and regeneration of transforming cells were performed on the medium that contained spectinomycin antibiotic and hormones. The PCR analysis indicated the presence of the proinsulin gene in transplastomic plants. The reverse-transcription PCR analysis confirmed the expression of the proinsulin–protein A fusion at the transcription level. Immunoblot assays of leaf-derived protein extracts confirmed that the target gene expression is up to 0.2% of the total soluble protein. Our study showed that protein A fusion is not as efficient as other reported fusions. The transplastomic plants were also confirmed for homoplasmy using Southern blot analysis. |
| Databáze: | OpenAIRE |
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