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Within the 80 kb aflatoxin pathway gene cluster characterized earlier, and between adhA and norA genes, we have identified an estA gene encoding an esterase from wild type strain Aspergillus parasiticus SRRC 143. The 1,500 bp genomic DNA and 945 bp cDNA sequences were determined for estA. Outside of the aflatoxin pathway gene cluster, an additional copy of the estA gene (named estA2) was also cloned...
Regulation of aflatoxin (AF) biosynthesis likely involves a complex interplay of positive- and negative-acting factors that are affected by physiological cues responsive to internal and external stimuli. These factors, presumably, modulate the expression of the AF pathway-specific regulatory gene, aflR, whose product, AFLR, a zinc cluster transcription factor, then turns on or off the transcription...
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