Abstract
Chloroplast transformation has many potential advantages for the production of recombinant proteins in plants. However, it has been reported that chloroplast expression of many proteins, such as human epidermal growth factor (hEGF), results hindered by post-transcriptional mechanisms. hEGF degradation has been related to the redox potential of the stroma and protein misfolding. To solve this problem, we proposed the redirection of hEGF into the thylakoid lumen where the environment could improve disulfide bonds formation stabilizing the functional conformation of the protein. We generated transplastomic tobacco plants targeting hEGF protein to the thylakoid lumen by adding a transit peptide (Str). Following this approach, we could detect thylakoid lumen-targeted hEGF by western blotting while stromal accumulation of hEGF remained undetectable. Southern blot analysis confirmed the integration of the transgene through homologous recombination into the plastome. Northern blot analysis showed similar levels of egf transcripts in the EGF and StrEGF lines. These results suggest that higher stability of the hEGF peptide in the thylakoid lumen is the primary cause of the increased accumulation of the recombinant protein observed in StrEGF lines. They also highlight the necessity of exploring different sub-organellar destinations to improve the accumulation levels of a specific recombinant protein in plastids.
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Acknowledgements
The authors would like to thank Dr. María Eugenia Segretin and Lic. Federico Gabriel Mirkin for critical reading of this manuscript. This work has been supported by Grant PICT 2014-2766 from Agencia Nacional de Promoción Científica y Tecnológica. EFA and NB are fellows of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, Argentina). MM and FBA are research scientists of CONICET. This work has also been supported by Fondo para la Investigación Científica y Tecnológica (Grant No. 2013-1355).
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FBA and MM conceived and designed research. FBA directed the project. MM, NB, CV, and EFA conducted experiments. FBA and MM analyzed data. FBA and MM wrote the manuscript. All authors read and approved the manuscript.
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Morgenfeld, M.M., Vater, C.F., Alfano, E.F. et al. Translocation from the chloroplast stroma into the thylakoid lumen allows expression of recombinant epidermal growth factor in transplastomic tobacco plants. Transgenic Res 29, 295–305 (2020). https://doi.org/10.1007/s11248-020-00199-7
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DOI: https://doi.org/10.1007/s11248-020-00199-7