Abstract
Klebsiella pneumoniae produces 3-hydroxypropionic acid (3-HP) from glycerol with oxidation of 3-hydroxypropionaldehyde (3-HPA) to 3-HP in a reaction catalyzed by aldehyde dehydrogenase (ALDH). In the present study, two putative ALDHs of K. pneumoniae, YneI and YdcW were identified and characterized. Recombinant YneI was specifically active on 3-HPA and preferred NAD+ as a cofactor, whereas YdcW exhibited broad substrate specificity and preferred NADP+ as a cofactor. Overexpression of ALDHs in the glycerol oxidative pathway-deficient mutant K. pneumoniae AK resulted in a significant increase in 3-HP production upon shake-flask culture. The final titers of 3-HP were 2.4 and 1.8 g L−1 by recombinants overexpressing YneI and YdcW, respectively. Deletion of the ALDH gene from K. pneumoniae did not affect the extent of 3-HP synthesis, implying non-specific activity of ALDHs on 3-HPA. The ALDHs might play major roles in detoxifying the aldehyde generated in glycerol metabolism.
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Acknowledgments
The authors are very grateful to Prof. Sunghoon Park for the kind gift of 3-hydroxypropionaldehyde. This study was supported by the Ministry of Education, Science and Technology, Korea.
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Luo, L.H., Seo, JW., Heo, SY. et al. Identification and characterization of Klebsiella pneumoniae aldehyde dehydrogenases increasing production of 3-hydroxypropionic acid from glycerol. Bioprocess Biosyst Eng 36, 1319–1326 (2013). https://doi.org/10.1007/s00449-012-0880-4
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DOI: https://doi.org/10.1007/s00449-012-0880-4