One-Pot Three-Enzyme System for Production of a Novel Prebiotic Mannosyl-β-(1 → 4)-Fructose Using a d-Mannose Isomerase from Xanthomonas phaseoli

J Agric Food Chem. 2022 Sep 28;70(38):12117-12127. doi: 10.1021/acs.jafc.2c04649. Epub 2022 Sep 19.

Abstract

The present supply of prebiotics is entirely inadequate to meet their demand. To produce novel prebiotics, a d-mannose isomerase (XpMIaseA) from Xanthomonas phaseoli was first produced in Komagataella phaffii (Pichia pastoris). XpMIaseA shared the highest amino acid sequence identity (58.0%) with the enzyme from Marinomonas mediterranea. Efficient secretory production of XpMIaseA (282.0 U mL-1) was achieved using high cell density fermentation. The optimal conditions of XpMIaseA were pH 7.5 and 55 °C. It showed a broad substrate specificity, which isomerized d-mannose, d-talose, mannobiose, epilactose, and mannotriose. XpMIaseA was employed to construct a one-pot three-enzyme system for the production of mannosyl-β-(1 → 4)-fructose (MF) using mannan (5%, w/v) as the substrate. The equilibrium yield of MF was 58.2%. In in vitro fermentations, MF significantly stimulated (≤3.2-fold) the growth of 12 among 15 tested Bifidobacterium and Lactobacillus strains compared with fructo-oligosaccharides. Thus, the novel d-mannose isomerase provides a one-pot bioconversion strategy for efficiently producing novel prebiotics.

Keywords: Komagataella phaffii (Pichia pastoris); d-mannose isomerase; mannosyl-β-(1 → 4)-fructose; one-pot production; prebiotic activity.

MeSH terms

  • Aldose-Ketose Isomerases
  • Fructose
  • Mannans* / metabolism
  • Mannose* / metabolism
  • Oligosaccharides / chemistry
  • Xanthomonas

Substances

  • Mannans
  • Oligosaccharides
  • Fructose
  • Aldose-Ketose Isomerases
  • mannose isomerase
  • Mannose

Supplementary concepts

  • Xanthomonas phaseoli