Abstract
In the present study, the genes encoding trypsinogen and active trypsin from Streptomyces griseus were both cloned and expressed in the methylotrophic yeast Pichia pastoris with the α-factor secretion signal under the control of the alcohol oxidase promoter. The mature trypsin was successfully accumulated extracellularly in soluble form with a maximum amidase activity of 6.6 U ml−1 (batch cultivation with flask cultivation) or 14.4 U ml−1 (fed-batch cultivation with a 3-l fermentor). In contrast, the recombinant trypsinogen formed inclusion bodies and no activity was detected. Replacement of the trypsin propeptide Ala-Pro-Asn-Pro confirmed that its physiological function was as a repressor of activity. More importantly, our results proved that the propeptide inhibited the activity of trypsinogen after its successful folding.
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Acknowledgments
We thank Professor Byong Lee at Jiangnan University for his discussion and revision. We also thank Professor Jian Jin and Ph.D. candidate Ying Hou at the School of Medicine and Pharmaceutics of Jiangnan University for their support with the mammalian cell digestions. This work was financially supported by the National High Technology Research and Development Program of China (863 Program, 2011AA100905), Program for Changjiang Scholars and Innovative Research Team in University (No. IRT1135), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Ling, Z., Ma, T., Li, J. et al. Functional expression of trypsin from Streptomyces griseus by Pichia pastoris . J Ind Microbiol Biotechnol 39, 1651–1662 (2012). https://doi.org/10.1007/s10295-012-1172-3
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DOI: https://doi.org/10.1007/s10295-012-1172-3