Abstract
The direct fermentative production of l-serine from sugar has attracted increasing attention. Corynebacterium glutamicum SYPS-062 can directly convert sugar to l-serine. In this study, the effects of exogenous and endogenous regulation of cofactor folate on C. glutamicum SYPS-062 growth and l-serine accumulation were investigated. For exogenous regulation, the inhibitor (sulfamethoxazole) or precursor (p-aminobenzoate) of folate biosynthesis was added to the medium, respectively. For endogenous regulation, the gene (pabAB) that encodes the key enzyme of folate biosynthesis was knocked out or overexpressed to obtain the recombinant C. glutamicum SYPS-062 ΔpabAB and SYPS-062(pJC-tac-pabAB), respectively. The results indicated that decreased levels of cofactor folate supported l-serine accumulation, whereas increased levels of cofactor folate aided in cell growth of C. glutamicum SYPS-062. Thus, this study not only elucidated the role of folate in C. glutamicum SYPS-062 growth and l-serine accumulation, but also provided a novel and convenient approach to regulate folate biosynthesis in C. glutamicum.
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This work was financially supported by the High Tech Development Program of China (863 Project, No. 2012AA022102) and the production project of Ministry of Education of Guangdong province (No. 2012B091000083).
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Zhang, X., Xu, G., Li, H. et al. Effect of Cofactor Folate on the Growth of Corynebacterium glutamicum SYPS-062 and l-Serine Accumulation. Appl Biochem Biotechnol 173, 1607–1617 (2014). https://doi.org/10.1007/s12010-014-0945-8
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DOI: https://doi.org/10.1007/s12010-014-0945-8