L-Methionine repressible promoters for tuneable gene expression in Trichoderma reesei.

Background Trichoderma reesei is the main producer of lignocellulolytic enzymes that are required for plant biomass hydrolysis in the biorefinery industry. Although the molecular toolbox for T. reesei is already well developed, repressible promoters for strain engineering and functional genomics studies are still lacking. One such promoter that is widely employed for yeasts is that of the l-methionine repressible MET3 gene, encoding ATP sulphurylase.