Co-production of 3-hydroxypropionic acid and 1,3-propanediol from glycerol using resting cells of recombinant Klebsiella pneumoniae J2B strain overexpressing aldehyde dehydrogenase. 2012

Vinod Kumar, and Mugesh Sankaranarayanan, and Kyeung-Eun Jae, and Meetu Durgapal, and Somasundar Ashok, and Yeounjoo Ko, and Ritam Sarkar, and Sunghoon Park
Department of Chemical and Biomolecular Engineering, Pusan National University, San 30, Jangjeon-dong, Geumjeong-gu, Busan, 609-735, South Korea.

The co-production of 3-hydroxypropionic acid (3HP) and 1,3-propanediol (PDO) from glycerol was studied using the resting cells of a recombinant Klebsiella pneumoniae J2B strain that overexpresses an aldehyde dehydrogenase (KGSADH). Active biomass was produced in a mineral salt medium containing yeast extract and glycerol under a range of aeration conditions, and shifted to potassium phosphate buffer containing glycerol for bioconversion. The microaerobic or anaerobic conditions were favorable for both the production of active biomass and subsequent bioconversion. At the flask level, the recombinant strain (2.0 g CDW/L) grown under microaerobic conditions produced 43.2 mM 3HP and 59.0 mM PDO from glycerol (117 mM) in 30 min with a cumulative yield of 0.87 (mol/mol). The fed-batch bioconversion, which was performed in a 1.5-L bioreactor with 1.0 g CDW/L at a constant pH 7.0 under anaerobic conditions, resulted in 125.6 mM 3HP and 209.5 mM PDO in 12 h with a cumulative overall productivity, yield, and maximum specific production rate of 27.9 mmol/L/h, 0.71 (mol/mol), and 128.5 mmol/g CDW/h, respectively. Lactate, succinate and 2,3-butanediol were the major by-products, whereas the production of acetate and ethanol was marginal. This is the first report of the simultaneous production of 3HP and PDO from glycerol using a resting cell system.

UI MeSH Term Description Entries
D007711 Klebsiella pneumoniae Gram-negative, non-motile, capsulated, gas-producing rods found widely in nature and associated with urinary and respiratory infections in humans. Bacillus pneumoniae,Bacterium pneumoniae crouposae,Hyalococcus pneumoniae,Klebsiella pneumoniae aerogenes,Klebsiella rhinoscleromatis
D011409 Propylene Glycols Derivatives of propylene glycol (1,2-propanediol). They are used as humectants and solvents in pharmaceutical preparations. Propanediols,Glycols, Propylene
D005990 Glycerol A trihydroxy sugar alcohol that is an intermediate in carbohydrate and lipid metabolism. It is used as a solvent, emollient, pharmaceutical agent, or sweetening agent. 1,2,3-Propanetriol,Glycerin,1,2,3-Trihydroxypropane,Glycerine
D000444 Aldehyde Dehydrogenase An enzyme that oxidizes an aldehyde in the presence of NAD+ and water to an acid and NADH. This enzyme was formerly classified as EC 1.1.1.70. D-Glucuronolactone Dehydrogenase,Aldehyde Dehydrogenase (NAD(+)),Aldehyde Dehydrogenase E1,Aldehyde Dehydrogenase E2,Aldehyde-NAD Oxidoreductase,Aldehyde NAD Oxidoreductase,D Glucuronolactone Dehydrogenase,Dehydrogenase, Aldehyde,Dehydrogenase, D-Glucuronolactone
D001426 Bacterial Proteins Proteins found in any species of bacterium. Bacterial Gene Products,Bacterial Gene Proteins,Gene Products, Bacterial,Bacterial Gene Product,Bacterial Gene Protein,Bacterial Protein,Gene Product, Bacterial,Gene Protein, Bacterial,Gene Proteins, Bacterial,Protein, Bacterial,Proteins, Bacterial
D012722 Sewage Refuse liquid or waste matter carried off by sewers. Sludge,Sludge Flocs
D060847 Metabolic Engineering Methods and techniques used to genetically modify cells' biosynthetic product output and develop conditions for growing the cells as BIOREACTORS. Engineering, Metabolic
D019344 Lactic Acid A normal intermediate in the fermentation (oxidation, metabolism) of sugar. The concentrated form is used internally to prevent gastrointestinal fermentation. (From Stedman, 26th ed) Lactate,2-Hydroxypropanoic Acid,2-Hydroxypropionic Acid,Ammonium Lactate,D-Lactic Acid,L-Lactic Acid,Propanoic Acid, 2-Hydroxy-, (2R)-,Propanoic Acid, 2-Hydroxy-, (2S)-,Sarcolactic Acid,2 Hydroxypropanoic Acid,2 Hydroxypropionic Acid,D Lactic Acid,L Lactic Acid,Lactate, Ammonium

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