Effects of manR disruption and overexpression on Aspergillus oryzae gene expression

ABSTRACT: Fungal endo-β-mannanases (β-mannanases) are widely used as industrial enzymes; however, no transcriptional regulator of β-mannanases has been identified in fungi or other eukaryotic cells to date. To identify a transcriptional regulator of β-mannanases in Aspergillus oryzae, a gene-disruptant library of transcriptional regulators was screened for mutants exhibiting reduced β-mannanase activity by using konjac glucomannan as the substrate, and ManR, a Zn(II)2Cys6 type DNA binding protein was identified. Moreover, a manR-overexpressing strain showed significantly increased β-mannanase activity. DNA microarray analysis of the manR-disruptant strain and the manR-overexpressing strain further indicated that when konjac glucomannan is used as the carbon source, ManR positively regulates the gene expression of not only β-mannanase, but also the enzymes involved in the degradation of galactomannans and glucomannans such as α-galactosidase, β-mannosidase, acetylmannan esterase, and β-glucosidase. Therefore, we conclude that ManR is a positive regulator of the β-mannan utilization system in A. oryzae.

ORGANISM(S): Aspergillus oryzae RIB40

PROVIDER: GSE40590 | GEO | 2012/11/08

SECONDARY ACCESSION(S): PRJNA174354

REPOSITORIES: GEO