Efficient cloning system for construction of gene silencing vectors in Aspergillus niger

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Oliveira, JM (Author) Other; van der Veen, D (Author) Other; de Graaff, LH (Author) Other; Qin, L (Author) Other

Journal

Title: Applied Microbiology and Biotechnology

Vol. 80

Pages: 917-924

ISSN: 0175-7598

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 17 Citations

Scopus - 16 Citations

Other information

Authenticus ID: P-00F-VD1

DOI: 10.1007/s00253-008-1640-x

Abstract (EN): An approach based on Gateway recombination technology to efficiently construct silencing vectors was developed for use in the biotechnologically important fungus Aspergillus niger. The transcription activator of xylanolytic and cellulolytic genes XlnR of A. niger was chosen as target for gene silencing. Silencing was based on the expression vector pXLNRir that was constructed and used in co-transformation. From all the strains isolated (N=77), nine showed poor xylan-degrading activities in two semi-quantitative plate assays testing different activities for xylan degradation. Upon induction on D-xylose, transcript levels of xlnR were decreased in the xlnR-silenced strains, compared to a wild-type background. Under these conditions, the transcript levels of xyrA and xynB (two genes regulated by XlnR) were also decreased for these xlnR-silenced strains. These results indicate that the newly developed system for rapid generation of silencing vectors is an effective tool for A. niger, and this can be used to generate strains with a tailored spectrum of enzyme activities or product formation by silencing specific genes encoding, e.g., regulators such as XlnR.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8