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Title: Engineering towards a complete heterologous cellulase secretome in Yarrowia lipolytica reveals its potential for consolidated bioprocessing

Abstract

Background: Yarrowia lipolytica is an oleaginous yeast capable of metabolizing glucose to lipids, which then accumulate intracellularly. However, it lacks the suite of cellulolytic enzymes required to break down biomass cellulose and cannot therefore utilize biomass directly as a carbon source. Toward the development of a direct microbial conversion platform for the production of hydrocarbon fuels from cellulosic biomass, the potential for Y. lipolytica to function as a consolidated bioprocessing strain was investigated by first conducting a genomic search and functional testing of its endogenous glycoside hydrolases. Once the range of endogenous enzymes was determined, the critical cellulases from Trichoderma reesei were cloned into Yarrowia. Results: Initially, work to express T. reesei endoglucanase II (EGII) and cellobiohydrolase (CBH) II in Y. lipolytica resulted in the successful secretion of active enzymes. However, a critical cellulase, T. reesei CBHI, while successfully expressed in and secreted from Yarrowia, showed less than expected enzymatic activity, suggesting an incompatibility (probably at the post-translational level) for its expression in Yarrowia. This result prompted us to evaluate alternative or modified CBHI enzymes. Our subsequent expression of a T. reesei-Talaromyces emersonii (Tr-Te) chimeric CBHI, Chaetomium thermophilum CBHI, and Humicola grisea CBHI demonstrated remarkably improved enzymatic activities. Specifically, themore » purified chimeric Tr-Te CBHI showed a specific activity on Avicel that is comparable to that of the native T. reesei CBHI. Furthermore, the chimeric Tr-Te CBHI also showed significant synergism with EGII and CBHII in degrading cellulosic substrates, using either mixed supernatants or co-cultures of the corresponding Y. lipolytica transformants. The consortia system approach also allows rational volume mixing of the transformant cultures in accordance with the optimal ratio of cellulases required for efficient degradation of cellulosic substrates. In Conclusion: Taken together, this work demonstrates the first case of successful expression of a chimeric CBHI with essentially full native activity in Y. lipolytica, and supports the notion that Y. lipolytica strains can be genetically engineered, ultimately by heterologous expression of fungal cellulases and other enzymes, to directly convert lignocellulosic substrates to biofuels.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
OSTI Identifier:
1164091
Report Number(s):
NREL/JA-2700-62643
Journal ID: ISSN 1754-6834
Grant/Contract Number:  
AC36-08-GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Biotechnology for Biofuels
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 1754-6834
Publisher:
BioMed Central
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Chemical and Biosciences; Yarrowia lipolytica; oleaginous yeast; heterologous expression; cellulase; cellobiohydrolase I; cellobiohydrolase II; endoglucanase II; cell consortia; advanced biofuels

Citation Formats

Wei, Hui, Wang, Wei, Alahuhta, Markus, Vander Wall, Todd, Baker, John O., Taylor, Larry E., Decker, Stephen R., Himmel, Michael E., and Zhang, Min. Engineering towards a complete heterologous cellulase secretome in Yarrowia lipolytica reveals its potential for consolidated bioprocessing. United States: N. p., 2014. Web. doi:10.1186/s13068-014-0148-0.
Wei, Hui, Wang, Wei, Alahuhta, Markus, Vander Wall, Todd, Baker, John O., Taylor, Larry E., Decker, Stephen R., Himmel, Michael E., & Zhang, Min. Engineering towards a complete heterologous cellulase secretome in Yarrowia lipolytica reveals its potential for consolidated bioprocessing. United States. doi:10.1186/s13068-014-0148-0.
Wei, Hui, Wang, Wei, Alahuhta, Markus, Vander Wall, Todd, Baker, John O., Taylor, Larry E., Decker, Stephen R., Himmel, Michael E., and Zhang, Min. Thu . "Engineering towards a complete heterologous cellulase secretome in Yarrowia lipolytica reveals its potential for consolidated bioprocessing". United States. doi:10.1186/s13068-014-0148-0. https://www.osti.gov/servlets/purl/1164091.
@article{osti_1164091,
title = {Engineering towards a complete heterologous cellulase secretome in Yarrowia lipolytica reveals its potential for consolidated bioprocessing},
author = {Wei, Hui and Wang, Wei and Alahuhta, Markus and Vander Wall, Todd and Baker, John O. and Taylor, Larry E. and Decker, Stephen R. and Himmel, Michael E. and Zhang, Min},
abstractNote = {Background: Yarrowia lipolytica is an oleaginous yeast capable of metabolizing glucose to lipids, which then accumulate intracellularly. However, it lacks the suite of cellulolytic enzymes required to break down biomass cellulose and cannot therefore utilize biomass directly as a carbon source. Toward the development of a direct microbial conversion platform for the production of hydrocarbon fuels from cellulosic biomass, the potential for Y. lipolytica to function as a consolidated bioprocessing strain was investigated by first conducting a genomic search and functional testing of its endogenous glycoside hydrolases. Once the range of endogenous enzymes was determined, the critical cellulases from Trichoderma reesei were cloned into Yarrowia. Results: Initially, work to express T. reesei endoglucanase II (EGII) and cellobiohydrolase (CBH) II in Y. lipolytica resulted in the successful secretion of active enzymes. However, a critical cellulase, T. reesei CBHI, while successfully expressed in and secreted from Yarrowia, showed less than expected enzymatic activity, suggesting an incompatibility (probably at the post-translational level) for its expression in Yarrowia. This result prompted us to evaluate alternative or modified CBHI enzymes. Our subsequent expression of a T. reesei-Talaromyces emersonii (Tr-Te) chimeric CBHI, Chaetomium thermophilum CBHI, and Humicola grisea CBHI demonstrated remarkably improved enzymatic activities. Specifically, the purified chimeric Tr-Te CBHI showed a specific activity on Avicel that is comparable to that of the native T. reesei CBHI. Furthermore, the chimeric Tr-Te CBHI also showed significant synergism with EGII and CBHII in degrading cellulosic substrates, using either mixed supernatants or co-cultures of the corresponding Y. lipolytica transformants. The consortia system approach also allows rational volume mixing of the transformant cultures in accordance with the optimal ratio of cellulases required for efficient degradation of cellulosic substrates. In Conclusion: Taken together, this work demonstrates the first case of successful expression of a chimeric CBHI with essentially full native activity in Y. lipolytica, and supports the notion that Y. lipolytica strains can be genetically engineered, ultimately by heterologous expression of fungal cellulases and other enzymes, to directly convert lignocellulosic substrates to biofuels.},
doi = {10.1186/s13068-014-0148-0},
journal = {Biotechnology for Biofuels},
number = 1,
volume = 7,
place = {United States},
year = {Thu Oct 16 00:00:00 EDT 2014},
month = {Thu Oct 16 00:00:00 EDT 2014}
}

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