Abstract
An attempt was made to assess the expression level and targeting of a human protein entitled recombinant tissue plasminogen activator (rt-PA) through accumulation in three cellular compartments including the endoplasmic reticulum and cytosolic and apoplastic spaces in transgenic tobacco plants. In this context, three chimeric constructs pBI-SP-tPA, pBI-tPA-KDEL, and pBI-Ext-tPA were employed and transferred into the tobacco plants through a popular transformation-based system called Agrobacterium tumefaciens. As an initial screening system, the incorporation of the rt-PA gene in the genomic DNA of tobacco transgenic plants and the possible existence of the rt-PA-specific transcript in the total RNAs of transgenic plant leaves were confirmed via PCR and reverse transcription (RT)-PCR, respectively. Southern blot analysis, in addition, was used to determine the copy number of the corresponding gene (i.e., t-PA) transformed into the each transgenic plant; one or more copies were detected regarding transformants derived from all three abovementioned constructs. According to the enzyme-linked immunosorbent assay, the mean values of t-PA expression were calculated as 0.50, 0.68, and 0.69 μg/mg of the total soluble protein when a collection containing 30 transgenic plants transformed with pBI-SP-tPA, pBI-tPA-KDEL, and pBI-Ext-tPA was taken into account, respectively. The zymography assay was lastly performed and concluded the expression of the properly folded rt-PA in this expression system. Our results, altogether, revealed that tobacco plants could be utilized as a bioreactor system for the large-scale production of enzymatically active t-PA and presumably other therapeutic recombinant proteins in large quantities.
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Goojani, H.G., Javaran, M.J., Nasiri, J. et al. Expression and Large-Scale Production of Human Tissue Plasminogen Activator (t-PA) in Transgenic Tobacco Plants Using Different Signal Peptides. Appl Biochem Biotechnol 169, 1940–1951 (2013). https://doi.org/10.1007/s12010-013-0115-4
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DOI: https://doi.org/10.1007/s12010-013-0115-4