Efficient and direct fermentation of starch to ethanol by sake yeast strains displaying fungal glucoamylases

Biosci Biotechnol Biochem. 2008 May;72(5):1376-9. doi: 10.1271/bbb.70825. Epub 2008 May 7.

Abstract

Aspergillus oryzae glucoamylases encoded by glaA and glaB, and Rhizopus oryzae glucoamylase, were displayed on the cell surface of sake yeast Saccharomyces cerevisiae GRI-117-UK and laboratory yeast S. cerevisiae MT8-1. Among constructed transformants, GRI-117-UK/pUDGAA, displaying glaA glucoamylase, produced the most ethanol from liquefied starch, although MT8-1/pUDGAR, displaying R. oryzae glucoamylase, had the highest glucoamylase activity on its cell surface.

MeSH terms

  • Aspergillus oryzae / enzymology
  • Ethanol / metabolism*
  • Fermentation*
  • Glucan 1,4-alpha-Glucosidase / metabolism*
  • Rhizopus / enzymology
  • Saccharomyces cerevisiae / cytology
  • Saccharomyces cerevisiae / metabolism*
  • Starch / metabolism*
  • Wine / microbiology*

Substances

  • Ethanol
  • Starch
  • Glucan 1,4-alpha-Glucosidase