Improving ionic liquid tolerance in Saccharomyces cerevisiae through heterologous expression and directed evolution of an ILT1 homolog from Yarrowia lipolytica

Author:

Reed Kevin B1,Wagner James M1,d’Oelsnitz Simon2,Wiggers Joshua M1,Alper Hal S12

Affiliation:

1. grid.89336.37 0000 0004 1936 9924 McKetta Department of Chemical Engineering The University of Texas at Austin 200 East Dean Keeton St., Stop C0400 78712 Austin TX USA

2. grid.89336.37 0000 0004 1936 9924 Institute for Cellular and Molecular Biology The University of Texas at Austin 2500 Speedway Avenue 78712 Austin TX USA

Abstract

Abstract Ionic liquids show promise for deconstruction of lignocellulosic biomass prior to fermentation. Yet, imidazolium ionic liquids (IILs) can be toxic to microbes even at concentrations present after recovery. Here, we show that dominant overexpression of an Ilt1p homolog (encoded by YlILT1/YALI0C04884) from the IIL-tolerant yeast Yarrowia lipolytica confers an improvement in 1-ethyl-3-methylimidazolium acetate tolerance in Saccharomyces cerevisiae compared to the endogenous Ilt1p (ScILT1/YDR090C). We subsequently enhance tolerance in S. cerevisiae through directed evolution of YlILT1 using growth-based selection, leading to identification of mutants that grow in up to 3.5% v/v ionic liquid. Lastly, we demonstrate that strains expressing YlILT1 variants demonstrate improved growth rate and ethanol production in the presence of residual IIL. This shows that dominant overexpression of a heterologous protein (wild type or evolved) from an IIL-tolerant yeast can increase tolerance in S. cerevisiae at concentrations relevant to bioethanol production from IIL-treated biomass.

Funder

Camille and Henry Dreyfus Foundation

Publisher

Oxford University Press (OUP)

Subject

Applied Microbiology and Biotechnology,Biotechnology,Bioengineering

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