Repression of the expression of genes encoding xylanolytic enzymes in Aspergillusoryzae by introduction of multiple copies of the xynF1 promoter |
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| Authors: | N Kitamoto S Yoshino M Ito T Kimura K Ohmiya N Tsukagoshi |
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| Institution: | (1) Food Research Institute, Aichi Prefectural Government, 2-1-1 Shinpukuji-cho, Nishi-ku, Nagoya 451–0083, Japan Tel.: +81-52-5219316 Fax: +81-52-5325791, JP;(2) Faculty of Bioresources, Mie University, Tsu 514-8507, Japan, JP;(3) Department of Applied Biological Sciences, Faculty of Agriculture, Nagoya University, Nagoya 464-8601, Japan, JP |
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| Abstract: | A xylanase gene, xynF1, was cloned and characterized from a shoyu koji mould Aspergillus oryzae KBN616. The xynF1 gene was found to be comprised of 1484 bp with ten introns. The deduced amino acid sequence encodes a protein consisting
of 327 amino acids (35,402 Da) which is very similar to the fungal family F xylanases such as Aspergillus nidulans XlnC, Aspergillus kawachii XynA and Penicillium chrysogenum XylP. The intron/exon organization of xynF1 is very similar to that of the fungal family F xylanase genes. Plasmid pXPR64, which contains 64 copies of the xynF1 promoter region (PxynF1) in the same direction, was constructed and introduced into A. oryzae. This led to reduced expression of both xylanase and β-xylosidase genes in the transformants.
Received: 18 May 1998 / Received revision: 7 July 1998 / Accepted: 9 July 1998 |
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