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Abstract:
D-Allulose is considered an ideal alternative to sucrose and has shown tremendous application potential in many fields. Recently, most efforts on production of D-allulose have focused on in vitro enzyme-catalyzed epimerization of cheap hexoses. Here, we proposed an approach to efficiently produce D-allulose through fermentation using metabolically engineered Escherichia coli JM109 (DE3), in which a SecY (Delta P) channel and a D-allulose 3-epimerase (DPEase) were co-expressed, ensuring that D-fructose could be transported in its nonphosphorylated form and then converted into D-allulose by cells. Further deletion of fruA, manXYZ, mak, galE, and fruK and the use of Ni2+ in a medium limited the carbon flux flowing into the byproduct-generating pathways and the Embden-Meyerhof-Parnas (EMP) pathway, achieving a approximate to 0.95 g/g yield of D-allulose on D-fructose using E. coli (DPEase, SecY [Delta P], Delta FruA, Delta ManXYZ, Delta Mak, Delta GalE, Delta FruK) and 8 mu M Ni2+. In fed-batch fermentation, the titer of D-allulose reached approximate to 23.3 g/L.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
ISSN: 0021-8561
Year: 2021
Issue: 45
Volume: 69
Page: 13578-13585
5 . 8 9 5
JCR@2021
5 . 7 0 0
JCR@2023
ESI Discipline: AGRICULTURAL SCIENCES;
ESI HC Threshold:84
JCR Journal Grade:1
CAS Journal Grade:2
Cited Count:
WoS CC Cited Count: 19
SCOPUS Cited Count: 19
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
Affiliated Colleges: