Construction of allitol synthesis pathway by multi-enzyme coexpression in Escherichia coli and its application in allitol production

J Ind Microbiol Biotechnol. 2015 May;42(5):661-9. doi: 10.1007/s10295-014-1578-1. Epub 2015 Feb 28.

Abstract

An engineered strain for the conversion of D-fructose to allitol was developed by constructing a multi-enzyme coupling pathway and cofactor recycling system in Escherichia coli. D-Psicose-3-epimerase from Ruminococcus sp. and ribitol dehydrogenase from Klebsiella oxytoca were coexpressed to form the multi-enzyme coupling pathway for allitol production. The cofactor recycling system was constructed using the formate dehydrogenase gene from Candida methylica for continuous NADH supply. The recombinant strain produced 10.62 g/l allitol from 100 mM D-fructose. To increase the intracellular concentration of the substrate, the glucose/fructose facilitator gene from Zymomonas mobilis was incorporated into the engineered strain. The results showed that the allitol yield was enhanced significantly to 16.53 g/l with a conversion rate of 92 %. Through optimizing conversion conditions, allitol was produced effectively on a large scale by the whole-cell biotransformation system; the yield reached 48.62 g/l when 500 mM D-fructose was used as the substrate.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bioreactors
  • Biosynthetic Pathways / genetics*
  • Biotransformation
  • Candida / enzymology
  • Candida / genetics
  • Carbohydrate Epimerases / genetics*
  • Carbohydrate Epimerases / metabolism
  • Escherichia coli / genetics*
  • Escherichia coli / metabolism
  • Formate Dehydrogenases / genetics*
  • Formate Dehydrogenases / metabolism
  • Fructose / metabolism
  • Klebsiella oxytoca / enzymology
  • Klebsiella oxytoca / genetics
  • Metabolic Engineering*
  • NAD / metabolism
  • Racemases and Epimerases / genetics
  • Racemases and Epimerases / metabolism
  • Ruminococcus / enzymology
  • Ruminococcus / genetics
  • Sugar Alcohol Dehydrogenases / genetics*
  • Sugar Alcohol Dehydrogenases / metabolism
  • Sugar Alcohols / metabolism*
  • Zymomonas / genetics

Substances

  • Sugar Alcohols
  • NAD
  • psicose
  • Fructose
  • allitol
  • Sugar Alcohol Dehydrogenases
  • ribitol 2-dehydrogenase
  • Formate Dehydrogenases
  • Racemases and Epimerases
  • Carbohydrate Epimerases