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Engineering All-Round Cellulase for Bioethanol Production.

Minghui Wang1, Haiyang Cui2, Chenlei Gu1

  • 1School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, No. 2 Xuelin Road, Nanjing 210097, China.

ACS Synthetic Biology
|July 5, 2023
PubMed
Summary
This summary is machine-generated.

Engineered cellulase variants significantly boost bioethanol production by overcoming ethanol inhibition. This protein engineering approach enhances enzyme stability and catalytic efficiency for improved biofuel yields.

Keywords:
bioethanolcellulasefermentationoptimized 2GenReProbust enzyme

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Area of Science:

  • Biotechnology
  • Bioenergy Engineering
  • Enzyme Engineering

Background:

  • Bioethanol production from biomass is crucial for reducing crude oil consumption and environmental impact.
  • Cellulolytic enzyme stability and hydrolysis efficiency are key limitations in bioethanol fermentation, often hindered by increasing ethanol concentrations.
  • Enzyme inactivation by ethanol reduces final bioethanol yield, necessitating strategies for enhanced enzyme performance.

Purpose of the Study:

  • To evolve cellulase CBHI (Carbohydrate-binding domain I) for improved performance in bioethanol production using an optimized Two-Gene Recombination Process (2GenReP).
  • To develop cellulase variants with enhanced resistance to ethanol, organic solvent inhibitors, and improved stability during simultaneous saccharification and fermentation (SSF).

Main Methods:

  • Utilized an optimized Two-Gene Recombination Process (2GenReP) to engineer cellulase CBHI.
  • Screened and identified two highly effective CBHI variants, designated R2 and R4.
  • Evaluated the catalytic efficiency (kcat/KM) and stability of the evolved variants under various conditions, including the presence of ethanol and organic solvents.

Main Results:

  • Two all-round CBHI variants, R2 and R4, were successfully evolved, exhibiting improved ethanol resistance, organic solvent tolerance, and SSF stability.
  • CBHI variant R4 demonstrated a 7.0- to 34.5-fold increase in catalytic efficiency (kcat/KM) in the presence and absence of ethanol.
  • Incorporating evolved CBHI R2 and R4 into the 1G bioethanol process led to a significant improvement in ethanol yield, up to 10.27% (6.7 g/L) higher than controls.

Conclusions:

  • The 2GenReP approach effectively generated robust cellulase variants for practical bioethanol fermentation.
  • The evolved CBHI variants (R2 and R4) offer superior stability and catalytic efficiency, overcoming key limitations in current bioethanol production processes.
  • This protein engineering strategy is transferable and holds potential for developing versatile enzymes for biotransformation and bioenergy applications.