Abstract
Thrombomodulin is a membrane-bound protein that plays an active role in the blood coagulation system by binding thrombin and initiating the protein C anticoagulant pathway. Solulin™ is a recombinant soluble derivative of human thrombomodulin. It is used for the treatment of thrombotic disorders. To evaluate the production of this pharmaceutical protein in plants, expression vectors were generated using four different N-terminal signal peptides. Immunoblot analysis of transiently transformed tobacco leaves showed that intact Solulin™ could be detected using three of these signal peptides. Furthermore transgenic tobacco plants and BY2 cells producing Solulin™ were generated. Immunoblot experiments showed that Solulin™ accumulated to maximum levels of 115 and 27 μg g−1 plant material in tobacco plants and BY2 cells, respectively. Activity tests performed on the culture supernatant of transformed BY2 cells showed that the secreted Solulin™ was functional. In contrast, thrombomodulin activity was not detected in total soluble protein extracts from BY2 cells, probably due to inhibitory effects of substances in the cell extract. N-terminal sequencing was carried out on partially purified Solulin™ from the BY2 culture supernatant. The sequence was identical to that of Solulin™ produced in Chinese hamster ovary cells, confirming correct processing of the N-terminal signal peptide. We have demonstrated that plants and plant cell cultures can be used as alternative systems for the production of an active recombinant thrombomodulin derivative.
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Schinkel, H., Schiermeyer, A., Soeur, R. et al. Production of an active recombinant thrombomodulin derivative in transgenic tobacco plants and suspension cells. Transgenic Res 14, 251–259 (2005). https://doi.org/10.1007/s11248-004-8082-8
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DOI: https://doi.org/10.1007/s11248-004-8082-8