Improvement of promoter activity by the introduction of multiple copies of the conserved region III sequence, involved in the efficient expression of Aspergillus oryzae amylase-encoding genes

T. Minetoki, C. Kumagai, Katsuya Gomi, K. Kitamoto, K. Takahashi

Research output: Contribution to journalArticle

76 Citations (Scopus)

Abstract

The role of the conserved sequence region III in the promoter regions of the amylase-encoding genes amyB, glaA and agdA of Aspergillus oryzae was examined. Introduction of multiple copies of the region III fragment into the agdA promoter resulted in a significant increase in promoter activity at the transcriptional level. This result suggests that the fragment comprising region III consists of one or more cis-acting sequence(s). Moreover, expression of the agdA gene under the control of the improved agdA promoter resulted in efficient overproduction of α-glucosidase, even in the presence of glucose. Thus, overexpression of genes controlled by the improved promoter incorporating region III is possible. Interestingly, expression of the amyB and glaA genes in the transformant was strongly repressed. This result suggests that the trans-acting regulatory protein(s) that interact with region III are common to these amylase genes and that the titration of regulatory protein(s) reduced the expression of the amyB and glaA genes.

Original languageEnglish
Pages (from-to)459-467
Number of pages9
JournalApplied Microbiology and Biotechnology
Volume50
Issue number4
DOIs
Publication statusPublished - 1998 Nov 18
Externally publishedYes

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

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