Abstract
Klebsiella pneumoniae converts glycerol to the specialty chemical 1,3-propanediol (1,3-PDO), which is used for the production of polytrimethylene terepthalate (PTT). In this study, an NAD+-dependent gamma-glutamyl-gamma-aminobutyraldehyde dehydrogenase (PuuC) of K. pneumoniae DSM 2026, which oxidizes 3-hydroxypropionaldehyde to a platform chemical 3-hydroxypropionic acid (3-HP), was cloned and overexpressed in K. pneumoniae DSM 2026 for the co-production of 3-HP and 1,3-PDO from glycerol. In addition, the gene dhaT, encoding NADH-dependent 1,3-propanediol oxidoreductase (1,3-PDOR), was deleted from the chromosome for the balanced production of 3-HP and 1,3-PDO. The recombinant K. pneumoniae ∆dhaT, expressing puuC, produced 3.6 g 3-HP and 3.0 g 1,3-PDO per liter with an average yield of 81% on glycerol carbon in shake flask culture under microaerobic conditions. When a fed-batch culture was carried out under microaerobic conditions at pH 7.0 in a 5-l bioreactor, the recombinant K. pneumoniae ∆dhaT (puuC) strain produced 16.0 g 3-HP and 16.8 g 1,3-PDO per liter with a cumulative yield of 51% on glycerol carbon in 24 h. The production of 1,3-PDO in the dhaT-deletion mutant was attributed to the expression of NAD(P)H-dependent hypothetical oxidoreductase. This study demonstrates the feasibility of obtaining two commercially valuable chemicals, 3-HP and 1,3-PDO, at a significant scale.
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Acknowledgments
This work was financially supported by the Korean Ministry of Commerce, Industry, and Energy (Grant No. 10028380-2006-11), and Korean Ministry of Education, Science and Technology through Advanced Biomass R&D Centre (ABC; Grant No. 2010-0029799), KAIST, Korea. Dr. S. M. Raj is grateful to the Brain Korea 21 program, Pusan National University for providing financial assistance.
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Ashok, S., Raj, S.M., Rathnasingh, C. et al. Development of recombinant Klebsiella pneumoniae ∆dhaT strain for the co-production of 3-hydroxypropionic acid and 1,3-propanediol from glycerol. Appl Microbiol Biotechnol 90, 1253–1265 (2011). https://doi.org/10.1007/s00253-011-3148-z
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DOI: https://doi.org/10.1007/s00253-011-3148-z