Page Banner

United States Department of Agriculture

Agricultural Research Service

Research Project: AFLATOXIN CONTROL THROUGH TARGETING MECHANISMS GOVERNING AFLATOXIN BIOSYNTHESIS IN CORN AND COTTONSEED Title: Understanding Nonaflatoxigenicity of Aspergillus sojae: A Windfall of Aflatoxin Biosynthesis Research

item Chang, Perng Kuang
item Matsushima, Kenichiro - NODA INST SCI RES
item Takahashi, Tadashi - NODA INST SCI RES
item Yu, Jiujiang
item Abe, Keietsu - TOHOKU UNIV
item Bhatnagar, Deepak
item Yuan, Gwo-Fang - FOOD IND R&D INST
item Koyama, Yasuji - NODA INST SCI RES
item Cleveland, Thomas

Submitted to: Applied Microbiology and Biotechnology
Publication Type: Review Article
Publication Acceptance Date: July 7, 2007
Publication Date: July 31, 2007
Citation: Chang, P.-K., Matsushima, K., Takahashi, T., Yu, J., Abe, K., Bhatnagar, D., Yuan, G., Koyama, Y., Cleveland, T.E. 2007. Understanding nonaflatoxigenicity of Aspergillus sojae: a windfall of aflatoxin biosynthesis research. Applied Microbiology and Biotechnology. 76:977-984.

Technical Abstract: Aspergillus section Flavi includes aflatoxin-producing and nonproducing fungi. A. sojae is unable to produce aflatoxins and is generally recognized as safe for food fermentation. However, because of its taxonomical relatedness to aflatoxin-producing A. parasiticus and A. flavus, it is necessary to decipher the underlying mechanisms for its inability to produce aflatoxins. This review addresses the relationship between A. sojae and A. parasiticus, and the advances that have been made in aflatoxin biosynthesis research, especially with regard to gene structure, genome organization, and gene regulation in A. parasiticus and A. flavus and how this has been used to assure the safety of A. sojae as an organism for food fermentation. The lack of aflatoxin-producing ability of A. sojae results primarily from an early termination point mutation in the pathway-specific aflR regulatory gene, which causes the truncation of the transcriptional activation domain of AflR and the abolishment of interaction between AflR and the AflJ co-activator. Both are required for gene expression. In addition, a defect in the polyketide synthase gene also contributes to its nonaflatoxigenicity.

Last Modified: 11/25/2015