D-Allulose Production from D-Fructose by Permeabilized Recombinant Cells of Corynebacterium glutamicum Cells Expressing D-Allulose 3-Epimerase Flavonifractor plautii

作者：Park Chul Soon; Kim Taeyong; Hong Seung Hye; Shin Kyung Chul; Kim Kyoung Rok; Oh Deok Kun^*

来源：PLos One, 2016, 11(7): e0160044.

DOI：10.1371/journal.pone.0160044

A D-allulose 3-epimerase from Flavonifractor plautii was cloned and expressed in Escherichia coli and Corynebacterium glutamicum. The maximum activity of the enzyme purified from recombinant E. coli cells was observed at pH 7.0, 65 degrees C, and 1 mM Co2+ with a half-life of 40 min at 65 degrees C, K-m of 162 mM, and k(cat) of 25280 1/s. For increased D-allulose production, recombinant C. glutamicum cells were permeabilized via combined treatments with 20 mg/L penicillin and 10% (v/v) toluene. Under optimized conditions, 10 g/L permeabilized cells produced 235 g/L D-allulose from 750 g/L D-fructose after 40 min, with a conversion rate of 31% (w/w) and volumetric productivity of 353 g/L/h, which were 1.4- and 2.1-fold higher than those obtained for nonpermeabilized cells, respectively.

• 出版日期2016-7-28