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Engineering yeasts for raw starch conversion

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Abstract

Next to cellulose, starch is the most abundant hexose polymer in plants, an import food and feed source and a preferred substrate for the production of many industrial products. Efficient starch hydrolysis requires the activities of both α-1,4 and α-1,6-debranching hydrolases, such as endo-amylases, exo-amylases, debranching enzymes, and transferases. Although amylases are widely distributed in nature, only about 10 % of amylolytic enzymes are able to hydrolyse raw or unmodified starch, with a combination of α-amylases and glucoamylases as minimum requirement for the complete hydrolysis of raw starch. The cost-effective conversion of raw starch for the production of biofuels and other important by-products requires the expression of starch-hydrolysing enzymes in a fermenting yeast strain to achieve liquefaction, hydrolysis, and fermentation (Consolidated Bioprocessing, CBP) by a single organism. The status of engineering amylolytic activities into Saccharomyces cerevisiae as fermentative host is highlighted and progress as well as challenges towards a true CBP organism for raw starch is discussed. Conversion of raw starch by yeast secreting or displaying α-amylases and glucoamylases on their surface has been demonstrated, although not at high starch loading or conversion rates that will be economically viable on industrial scale. Once efficient conversion of raw starch can be demonstrated at commercial level, engineering of yeast to utilize alternative substrates and produce alternative chemicals as part of a sustainable biorefinery can be pursued to ensure the rightful place of starch converting yeasts in the envisaged bio-economy of the future.

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Authors and Affiliations

  1. Department of Microbiology, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa

    W. H. van Zyl, M. Bloom & M. J. Viktor

  2. Department of Microbiology, University of Stellenbosch, Stellenbosch, 7600, South Africa

    W. H. van Zyl, M. Bloom & M. J. Viktor

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  1. W. H. van Zyl
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  2. M. Bloom
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Correspondence to W. H. van Zyl.

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van Zyl, W.H., Bloom, M. & Viktor, M.J. Engineering yeasts for raw starch conversion. Appl Microbiol Biotechnol 95, 1377–1388 (2012). https://doi.org/10.1007/s00253-012-4248-0

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