TY - JOUR
T1 - Cellulase productivity of Trichoderma reesei mutants developed in Japan varies with varying pH conditions
AU - Hirasawa, Hiroki
AU - Shioya, Koki
AU - Mori, Kazuki
AU - Tashiro, Kosuke
AU - Aburatani, Sachiyo
AU - Shida, Yosuke
AU - Kuhara, Satoru
AU - Ogasawara, Wataru
N1 - Funding Information:
This work was supported by a grant from the New Energy and Industrial Technology Development Organization (NEDO) Project ( P16009 ).
Publisher Copyright:
© 2019 The Society for Biotechnology, Japan
PY - 2019/9
Y1 - 2019/9
N2 - The ascomycete Trichoderma reesei is known to produce a variety of cellulases and hemicellulases and the hyper-cellulolytic mutants of this fungus are useful as industrial cellulase producers. In Japan, PC-3-7, derived from the early mutant QM9414, is well-known as a cellulase hyperproducing mutant. In addition to the productivity of enzymes, the composition of secreted enzymes greatly influences biomass saccharification. Therefore, we evaluated the cellulase productivity of T. reesei mutants in Japan at different pH as a factor influencing enzyme production. At higher pH values, QM9414 exhibited reduced cellulase productivity whereas PC-3-7 maintained high cellulase productivity and gene expression at the transcriptional level. The gene encoding the pH-responsive transcription factor PACI did not mutate in PC-3-7, and its expression pattern against different pH conditions was similar between QM9414 and PC-3-7. Furthermore, the deletion of pac1 encoding PACI caused different expression patterns of cellulase genes between QM9414 and PC-3-7. Therefore, we suggest that T. reesei possesses a pH-responsive cellulase production mechanism that is different from the PACI-related mechanism. Finally, we identified that N-25, a strain developed at an early stage of mutant development acquired cellulase productivity at a higher pH. In this investigation, we also found and tested candidate genes possibly affecting pH response using comparative genome analysis.
AB - The ascomycete Trichoderma reesei is known to produce a variety of cellulases and hemicellulases and the hyper-cellulolytic mutants of this fungus are useful as industrial cellulase producers. In Japan, PC-3-7, derived from the early mutant QM9414, is well-known as a cellulase hyperproducing mutant. In addition to the productivity of enzymes, the composition of secreted enzymes greatly influences biomass saccharification. Therefore, we evaluated the cellulase productivity of T. reesei mutants in Japan at different pH as a factor influencing enzyme production. At higher pH values, QM9414 exhibited reduced cellulase productivity whereas PC-3-7 maintained high cellulase productivity and gene expression at the transcriptional level. The gene encoding the pH-responsive transcription factor PACI did not mutate in PC-3-7, and its expression pattern against different pH conditions was similar between QM9414 and PC-3-7. Furthermore, the deletion of pac1 encoding PACI caused different expression patterns of cellulase genes between QM9414 and PC-3-7. Therefore, we suggest that T. reesei possesses a pH-responsive cellulase production mechanism that is different from the PACI-related mechanism. Finally, we identified that N-25, a strain developed at an early stage of mutant development acquired cellulase productivity at a higher pH. In this investigation, we also found and tested candidate genes possibly affecting pH response using comparative genome analysis.
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U2 - 10.1016/j.jbiosc.2019.03.005
DO - 10.1016/j.jbiosc.2019.03.005
M3 - Article
C2 - 30975564
AN - SCOPUS:85064008698
SN - 1389-1723
VL - 128
SP - 264
EP - 273
JO - Journal of Bioscience and Bioengineering
JF - Journal of Bioscience and Bioengineering
IS - 3
ER -