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  • Title: Fermentative production of (R)-(-)-3-hydroxybutyrate using 3-hydroxybutyrate dehydrogenase null mutant of Ralstonia eutropha and recombinant Escherichia coli.
    Author: Shiraki M, Endo T, Saito T.
    Journal: J Biosci Bioeng; 2006 Dec; 102(6):529-34. PubMed ID: 17270718.
    Abstract:
    Two systems, one using an (R)-(-)-3-hydroxybutyrate dehydrogenase (BDH) null mutant of Ralstonia eutropha and the other using a recombinant Escherichia coli strain containing a synthetic poly[(R)-(-)-3-hydroxybutyrate] (PHB) operon and an extracellular PHB depolymerase gene, were used for the fermentative production of (R)-(-)-3-hydroxybutyrate (3HB). The concentration of 3HB in the culture supernatant of the mutant R. eutropha system reached about 30 mM after 5 d under anaerobic conditions, although it was about 4-10 mM under aerobic conditions. On the other hand, the 3HB concentration in the culture supernatant of the recombinant E. coli system reached about 70 mM after 4 d, indicating that about 70% of the glucose added was converted to 3HB.
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