Abstract
N-acetyl-l-glutamate kinase (NAGK) catalyzes the second step of l-arginine biosynthesis and is inhibited by l-arginine in Corynebacterium crenatum. To ascertain the basis for the arginine sensitivity of CcNAGK, residue E19 which located at the entrance of the Arginine-ring was subjected to site-saturated mutagenesis and we successfully illustrated the inhibition-resistant mechanism. Typically, the E19Y mutant displayed the greatest deregulation of l-arginine feedback inhibition. An equally important strategy is to improve the catalytic activity and thermostability of CcNAGK. For further strain improvement, we used site-directed mutagenesis to identify mutations that improve CcNAGK. Results identified variants I74V, F91H and K234T display higher specific activity and thermostability. The l-arginine yield and productivity of the recombinant strain C. crenatum SYPA-EH3 (which possesses a combination of all four mutant sites, E19Y/I74V/F91H/K234T) reached 61.2 and 0.638 g/L/h, respectively, after 96 h in 5 L bioreactor fermentation, an increase of approximately 41.8% compared with the initial strain.
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Acknowledgements
This work was supported by the High-tech Research and Development Programs of China (2015AA021004), the National Natural Science Foundation of China (31300028), the Jiangsu Provincial National Basic Research Program (BK20150002, BK20130137), the Research Project of Chinese Ministry of Education (113033A), the Program Funded by China Scholarship Council, the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the 111 Project (No. 111-2-06), and the Jiangsu province “Collaborative Innovation Center for Advanced Industrial Fermentation” industry development program.
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Zhang, J., Xu, M., Ge, X. et al. Reengineering of the feedback-inhibition enzyme N-acetyl-l-glutamate kinase to enhance l-arginine production in Corynebacterium crenatum . J Ind Microbiol Biotechnol 44, 271–283 (2017). https://doi.org/10.1007/s10295-016-1885-9
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DOI: https://doi.org/10.1007/s10295-016-1885-9