4.4 Article

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

Journal

BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 72, Issue 5, Pages 1376-1379

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.70825

Keywords

sake yeast; Aspergillus oryzae; glucoamylase; cell-surface engineering; bioethanol

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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.

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