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Expression of NAD(H) Kinase and Glucose-6-Phosphate Dehydrogenase Improve NADPH Supply and l-isoleucine Biosynthesis in Corynebacterium glutamicum ssp. lactofermentum

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Abstract

Corynebacterium glutamicum is the workhorse for the production of amino acids, including l-isoleucine (Ile). During Ile biosynthesis, NADPH is required as a crucial cofactor. In this study, four NADPH-supplying strategies based on NAD kinase, NADH kinase, glucose-6-phosphate dehydrogenase, and NAD kinase coupling with glucose-6-phosphate dehydrogenase were compared, and their influences on Ile biosynthesis were examined. PpnK is a NAD kinase of C. glutamicum ssp. lactofermentum JHI3-156 that predominantly phosphorylates NAD+ to produce NADP+. Pos5 is a NADH kinase of Saccharomyces cerevisiae that predominantly phosphorylates NADH to produce NADPH. Zwf is a glucose-6-phosphate dehydrogenase of JHI3-156. The ppnK, POS5, zwf, and zwf-ppnK genes were overexpressed in the Ile-producing strain JHI3-156. The expression of all four genes increased intracellular NADPH concentration and Ile production. The increase of NADPH concentration and Ile production in a POS5-expressing strain (229 and 75.6 %, respectively) was higher than that in a ppnK-expression strain. The expression of zwf also increased NADPH supply and Ile biosynthesis, but the constitutive expression of zwf was not as effective as the inducible expression of zwf. Coexpression of zwf and ppnK genes greatly enhanced NADPH supply and thus improved Ile production by up to 85.9 %, indicating that this strategy was the most effective one. These results are helpful for improving Ile biosynthesis and other biosynthetic processes.

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Acknowledgments

This work was supported by the grants from the National Natural Science Foundation of China (no. 30870056).

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Authors and Affiliations

  1. State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, China

    Feng Shi, Kun Li, Xiaojing Huan & Xiaoyuan Wang

  2. The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China

    Feng Shi, Kun Li, Xiaojing Huan & Xiaoyuan Wang

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  1. Feng Shi
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Correspondence to Feng Shi.

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Shi, F., Li, K., Huan, X. et al. Expression of NAD(H) Kinase and Glucose-6-Phosphate Dehydrogenase Improve NADPH Supply and l-isoleucine Biosynthesis in Corynebacterium glutamicum ssp. lactofermentum . Appl Biochem Biotechnol 171, 504–521 (2013). https://doi.org/10.1007/s12010-013-0389-6

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