Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 79, Issue 3, Pages 488-495Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09168451.2014.982501
Keywords
Aspergillus aculeatus; cellulase-related genes; ClbR; gene regulation
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Funding
- New Energy and Industrial Technology Development Organization (NEDO) Project
- [23780086]
- Grants-in-Aid for Scientific Research [25450110] Funding Source: KAKEN
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ClbR is a Zn(II)(2)Cys(6) transcriptional activator that controls the expression of cellulase-related genes in response to Avicel and cellobiose in Aspergillus aculeatus. A clbR-overexpressing strain (clbR-OE) that expresses the clbR gene at levels sevenfold higher than the control strain sustainably produced xylanolytic and cellulolytic activities during 10-day cultivation of A. aculeatus, enabling synchronization of xylanolytic and cellulolytic activities at a maximum level. However, clbR overexpression did not simultaneously increase levels of all xylanolytic and cellulolytic enzymes. Peptide mass fingerprint analysis revealed markedly increased production of FIa-xylanase in clbR-OE, whereas expression of FIII-avicelase and FII-carboxymethyl cellulase was unaffected and expression of hydrocellulase was lower in clbR-OE than in the control. Northern blot analysis confirmed that these effects of clbR overexpression on enzyme production were mediated at the transcriptional level. These data suggest that ClbR participates in diverse signaling pathways to control the expression of cellulosic biomass-degrading enzymes in A. aculeatus.
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