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Title: Evolved strains of Scheffersomyces stipitis achieving high ethanol productivity on acid- and base-pretreated biomass hydrolyzate at high solids loading

Journal Article · · Biotechnology for Biofuels
 [1];  [2];  [2];  [2];  [3];  [4];  [4];  [4];  [4];  [2]
  1. USDA National Center for Agricultural Utilization Research, Peoria, IL (United States). Bioenergy Research Unit.; None
  2. USDA National Center for Agricultural Utilization Research, Peoria, IL (United States). Bioenergy Research Unit.
  3. USDA National Center for Agricultural Utilization Research, Peoria, IL (United States). Bacterial Foodborne Pathogens and Mycology Research.
  4. Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center (GLBRC).

Lignocellulosic biomass is an abundant, renewable feedstock useful for the production of fuel-grade ethanol via the processing steps of pretreatment, enzyme hydrolysis, and microbial fermentation. Traditional industrial yeasts do not ferment xylose and are not able to grow, survive, or ferment in concentrated hydrolyzates that contain enough sugar to support economical ethanol recovery since they are laden with toxic byproducts generated during pretreatment. Repetitive culturing in two types of concentrated hydrolyzates was applied along with ethanol challenged xylose-fed continuous culture to force targeted evolution of the native pentose fermenting yeast Scheffersomyces (Pichia) stipitis strain NRRL Y-7124 maintained in the ARS Culture Collection, Peoria, IL. Isolates collected from various enriched populations were screened and ranked based on relative xylose uptake rate and ethanol yield. Ranking on hydrolyzates with and without nutritional supplementation was used to identify those isolates with best performance across diverse conditions. Robust S. stipitis strains adapted to perform very well in enzyme hydrolyzates of high solids loading ammonia fiber expansion-pretreated corn stover (18% weight per volume solids) and dilute sulfuric acid-pretreated switchgrass (20% w/v solids) were obtained. Improved features include reduced initial lag phase preceding growth, significantly enhanced fermentation rates, improved ethanol tolerance and yield, reduced diauxic lag during glucose-xylose transition, and ability to accumulate >40 g/L ethanol in <167 h when fermenting hydrolyzate at low initial cell density of 0.5 absorbance units and pH 5 to 6.

Research Organization:
Great Lakes Bioenergy Research Center (GLBRC), Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FC02-07ER64494
OSTI ID:
1184797
Journal Information:
Biotechnology for Biofuels, Journal Name: Biotechnology for Biofuels Journal Issue: 1 Vol. 8; ISSN 1754-6834
Publisher:
BioMed CentralCopyright Statement
Country of Publication:
United States
Language:
English

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Genome and metabolic engineering in non-conventional yeasts: Current advances and applications journal September 2017
Optimization of cellulolytic enzyme components through engineering Trichoderma reesei and on-site fermentation using the soluble inducer for cellulosic ethanol production from corn stover journal February 2018
Comparative lipid production by oleaginous yeasts in hydrolyzates of lignocellulosic biomass and process strategy for high titers: High Titer Lipid Production by Yeasts in Lignocellulosic Hydrolyzates journal February 2016
Adaptive laboratory evolution of nanocellulose‐producing bacterium journal May 2019
Optimization of cellulolytic enzyme components through engineering Trichoderma reesei and on-site fermentation using the soluble inducer for cellulosic ethanol production from corn stover journal February 2018
Synthetic biology for evolutionary engineering: from perturbation of genotype to acquisition of desired phenotype journal May 2019
Genomic and transcriptomic analysis of Candida intermedia reveals the genetic determinants for its xylose-converting capacity journal March 2020
Global Warming Potential of Biomass-to-Ethanol: Review and Sensitivity Analysis through a Case Study journal July 2019