期刊
JOURNAL OF MOLECULAR MICROBIOLOGY AND BIOTECHNOLOGY
卷 24, 期 1, 页码 37-45出版社
KARGER
DOI: 10.1159/000355264
关键词
Shikimic acid; Dehydroshikimic acid; Bacillus subtilis; Metabolic engineering; Pyruvate kinase; Phosphoenolpyruvate
资金
- Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT)/Universidad Nacional Autonoma de Mexico [IN203007-2]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) [D43243-Z, 83039]
The glycolytic intermediate phosphoenolpyruvate (PEP) is a precursor of several cellular components, including various aromatic compounds. Modifications to the PEP node such as PEP: sugar phosphotransferase system (PTS) or pyruvate kinase inactivation have been shown to have a positive effect on aromatics production capacity in Escherichia coli and Bacillus subtilis. In this study, pyruvate kinase and PTS-deficient B. subtilis strains were employed for the construction of derivatives lacking shikimate kinase activity that accumulate two industrially valuable chemicals, the intermediates of the common aromatic pathway, shikimic and dehydroshikimic acids. The pyruvate kinase-deficient strain (CLC6-PYKA) showed the best production parameters under resting-cell conditions. Compared to the PTS-deficient strain, the shikimic and dehydroshikimic acids specific production rates for CLC6-PYKA were 1.8- and 1.7-fold higher, respectively. A batch fermentor culture using complex media supplemented with 83 g/l of glucose was developed with strain CLC6-PYKA, where final titers of 4.67 g/l ( shikimic acid) and 6.2 g/l (dehydroshikimic acid) were produced after 42 h. (C) 2013 S. Karger AG, Basel
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