Abstract
The plant-based expression systems are now accredited as bioreactors for the high production of various biopharmaceuticals. However, low levels of agglomeration and the absence of effective procedures for purification of recombinant proteins have remained two essential obstacles in molecular farming. In this research, we have studied the production of human interferon gamma (hIFN-γ) in tobacco and analyzed the effects of elastin-like polypeptide (ELP) tag and subcellular localization on its accumulation. We report a remarkable enhancement of accumulation of the fusion proteins versus the corresponding unfused hIFN-γ proteins. Furthermore, the hIFN-γ (with and without ELP) accumulated to higher levels in the endoplasmic reticulum. The ELP fusion proteins were successfully recovered from total soluble protein with adding 2.75 M NaCl and three rounds of inverse transition cycling (ITC). The hIFN-γ was also separated from ELP with Enterokinase cleavage of the fusion protein and recovered by ITC. Inverse transition analysis indicated that the hIFN-γ-ELP variants aggregate above their inverse transition temperature and at high ionic strength. Investigation of glycosylation revealed that fused or unfused hIFN-γ proteins are N-glycosylated in different cellular locations. Moreover, N-glycosylation analysis and bioassay showed that fusion to ELP does not disturb glycosylation process and antiviral activity of hIFN-γ.
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Abbreviations
- BSA:
-
Bovine serum albumin
- CaMV:
-
Cauliflower mosaic virus
- CHO:
-
Chinese hamster ovary
- CPMV:
-
Cowpea mosaic virus
- DAB:
-
3, 3′-Diaminobenzidine
- ELISA:
-
Enzyme-linked immunosorbent assay
- ELP:
-
Elastin-like polypeptides
- ER:
-
Endoplasmic reticulum
- Ext:
-
Extensin signal peptide
- hIFN-γ:
-
Human interferon-γ
- ITC:
-
Inverse transition cycling
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- nos :
-
Nopaline synthase
- PTM:
-
Post-translation modification
- PVP:
-
Polyvinyl pyrrolidone
- qRT-PCR:
-
Quantitative real-time PCR
- TSP:
-
Total soluble protein
- Tt:
-
Inverse transition temperature
- UTR:
-
Untranslated regions
- VSV:
-
Vesicular stomatitis virus
- Zera:
-
γ-Zein signal peptide
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Acknowledgements
This study was financially supported by Grant No: 951105 of the Biotechnology Development Council of the Islamic Republic of Iran.
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Heidari-Japelaghi, R., Valizadeh, M., Haddad, R. et al. Fusion to elastin-like polypeptide increases production of bioactive human IFN-γ in tobacco. Transgenic Res 29, 381–394 (2020). https://doi.org/10.1007/s11248-020-00205-y
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DOI: https://doi.org/10.1007/s11248-020-00205-y