Abstract
Until recently, the methylotrophic yeast has not been considered as a potential producer of biofuels, particularly, ethanol from lignocellulosic hydrolysates. The first work published 10 years ago revealed the ability of the thermotolerant methylotrophic yeast Hansenula polymorpha to ferment xylose—one of the main sugars of lignocellulosic hydrolysates—which has made the yeast a promising organism for high-temperature alcoholic fermentation. Such a feature of H. polymorpha could be used in the implementation of a potentially effective process of simultaneous saccharification and fermentation (SSF) of raw materials. SSF makes it possible to combine enzymatic hydrolysis of raw materials with the conversion of the sugars produced into ethanol: enzymes hydrolyze polysaccharides to monomers, which are immediately consumed by microorganisms (producers of ethanol). However, the efficiency of alcoholic fermentation of major sugars produced via hydrolysis of lignocellulosic raw materials and, especially, xylose by wild strains of H. polymorpha requires significant improvements. In this review, the main results of metabolic engineering of H. polymorpha for the construction of improved producers of ethanol from xylose, starch, xylan, and glycerol, as well as that of strains with increased tolerance to high temperatures and ethanol, are represented.
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Original Russian Text © K.V. Dmytruk, A.A. Sibirny, 2013, published in Tsitologiya i Genetika, 2013, Vol. 47, No. 6, pp. 3–21.
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Dmytruk, K.V., Sibirny, A.A. Metabolic engineering of the yeast Hansenula polymorpha for the construction of efficient ethanol producers. Cytol. Genet. 47, 329–342 (2013). https://doi.org/10.3103/S0095452713060029
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DOI: https://doi.org/10.3103/S0095452713060029