Genome sequencing of the Trichoderma reesei QM9136 mutant identifies a truncation of the transcriptional regulator XYR1 as the cause for its cellulase-negative phenotype
Abstract
Here, Trichoderma reesei is the main industrial source of cellulases and hemicellulases required for the hydrolysis of biomass to simple sugars, which can then be used in the production of biofuels and biorefineries. The highly productive strains in use today were generated by classical mutagenesis. As byproducts of this procedure, mutants were generated that turned out to be unable to produce cellulases. In order to identify the mutations responsible for this inability, we sequenced the genome of one of these strains, QM9136, and compared it to that of its progenitor T. reesei QM6a. In QM9136, we detected a surprisingly low number of mutagenic events in the promoter and coding regions of genes, i.e. only eight indels and six single nucleotide variants. One of these indels led to a frame-shift in the Zn2Cys6 transcription factor XYR1, the general regulator of cellulase and xylanase expression, and resulted in its C-terminal truncation by 140 amino acids. Retransformation of strain QM9136 with the wild-type xyr1 allele fully recovered the ability to produce cellulases, and is thus the reason for the cellulase-negative phenotype. Introduction of an engineered xyr1 allele containing the truncating point mutation into the moderate producer T. reesei QM9414 rendered this strain alsomore »
- Authors:
-
- Vienna Univ. of Technology (Austria). Inst. of Chemical Engineering
- French Inst. of Petroleum (IFP), Rueil-Mamaison (France)
- Univ. of Paris, Sorbonne (France)
- U.S. Joint Genome Inst., Walnut Creek, CA (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Genomics Division; Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC). Joint Genome Institute; Austrian Science Fund (FWF); USDOE
- OSTI Identifier:
- 1242698
- Alternate Identifier(s):
- OSTI ID: 1185053; OSTI ID: 1208746
- Report Number(s):
- LBNL-177776; PNNL-SA-110701
Journal ID: ISSN 1471-2164; ir:177776
- Grant/Contract Number:
- AC02-05CH11231 P-23202; I-1249; P24219; AC02-05CH11231; AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- BMC Genomics
- Additional Journal Information:
- Journal Volume: 16; Journal Issue: 1; Related Information: The Erratum to this article has been published in BMC Genomics 2015 16:725; Journal ID: ISSN 1471-2164
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; single nucleotide polymorphism; SNP; indel; comparative genomics; classical mutant; XYR1; transcription; factor shuttling; cellulases; Trichoderma reesei; QM9136; Trichoderma reesei; transcription factor shuttling
Citation Formats
Lichius, Alexander, Bidard, Frédérique, Buchholz, Franziska, Le Crom, Stéphane, Martin, Joel, Schackwitz, Wendy, Austerlitz, Tina, Grigoriev, Igor V., Baker, Scott E., Margeot, Antoine, Seiboth, Bernhard, and Kubicek, Christian P. Genome sequencing of the Trichoderma reesei QM9136 mutant identifies a truncation of the transcriptional regulator XYR1 as the cause for its cellulase-negative phenotype. United States: N. p., 2015.
Web. doi:10.1186/s12864-015-1526-0.
Lichius, Alexander, Bidard, Frédérique, Buchholz, Franziska, Le Crom, Stéphane, Martin, Joel, Schackwitz, Wendy, Austerlitz, Tina, Grigoriev, Igor V., Baker, Scott E., Margeot, Antoine, Seiboth, Bernhard, & Kubicek, Christian P. Genome sequencing of the Trichoderma reesei QM9136 mutant identifies a truncation of the transcriptional regulator XYR1 as the cause for its cellulase-negative phenotype. United States. https://doi.org/10.1186/s12864-015-1526-0
Lichius, Alexander, Bidard, Frédérique, Buchholz, Franziska, Le Crom, Stéphane, Martin, Joel, Schackwitz, Wendy, Austerlitz, Tina, Grigoriev, Igor V., Baker, Scott E., Margeot, Antoine, Seiboth, Bernhard, and Kubicek, Christian P. Mon .
"Genome sequencing of the Trichoderma reesei QM9136 mutant identifies a truncation of the transcriptional regulator XYR1 as the cause for its cellulase-negative phenotype". United States. https://doi.org/10.1186/s12864-015-1526-0. https://www.osti.gov/servlets/purl/1242698.
@article{osti_1242698,
title = {Genome sequencing of the Trichoderma reesei QM9136 mutant identifies a truncation of the transcriptional regulator XYR1 as the cause for its cellulase-negative phenotype},
author = {Lichius, Alexander and Bidard, Frédérique and Buchholz, Franziska and Le Crom, Stéphane and Martin, Joel and Schackwitz, Wendy and Austerlitz, Tina and Grigoriev, Igor V. and Baker, Scott E. and Margeot, Antoine and Seiboth, Bernhard and Kubicek, Christian P.},
abstractNote = {Here, Trichoderma reesei is the main industrial source of cellulases and hemicellulases required for the hydrolysis of biomass to simple sugars, which can then be used in the production of biofuels and biorefineries. The highly productive strains in use today were generated by classical mutagenesis. As byproducts of this procedure, mutants were generated that turned out to be unable to produce cellulases. In order to identify the mutations responsible for this inability, we sequenced the genome of one of these strains, QM9136, and compared it to that of its progenitor T. reesei QM6a. In QM9136, we detected a surprisingly low number of mutagenic events in the promoter and coding regions of genes, i.e. only eight indels and six single nucleotide variants. One of these indels led to a frame-shift in the Zn2Cys6 transcription factor XYR1, the general regulator of cellulase and xylanase expression, and resulted in its C-terminal truncation by 140 amino acids. Retransformation of strain QM9136 with the wild-type xyr1 allele fully recovered the ability to produce cellulases, and is thus the reason for the cellulase-negative phenotype. Introduction of an engineered xyr1 allele containing the truncating point mutation into the moderate producer T. reesei QM9414 rendered this strain also cellulase-negative. The correspondingly truncated XYR1 protein was still able to enter the nucleus, but failed to be expressed over the basal constitutive level. In conclusion, the missing 140 C-terminal amino acids of XYR1 are therefore responsible for its previously observed auto-regulation which is essential for cellulases to be expressed. Our data present a working example of the use of genome sequencing leading to a functional explanation of the QM9136 cellulase-negative phenotype.},
doi = {10.1186/s12864-015-1526-0},
journal = {BMC Genomics},
number = 1,
volume = 16,
place = {United States},
year = {Mon Apr 20 00:00:00 EDT 2015},
month = {Mon Apr 20 00:00:00 EDT 2015}
}
Web of Science
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