Role of the regulatory gene areA of Aspergillus oryzae in nitrogen metabolism

Article Abstract:

Research was conducted to examine the role of the regulatory gene areA of Aspergillus oryzae in nitrogen metabolism. Cloning of the areA gene of A. oryzae was performed by cross-hybridization with the A. nidulans areA gene and was discovered to encode an 866-amino-acid protein very similar to other fungal nitrogen regulatory proteins. Results indicate the critical role that the AreA protein may play in the regulation of nitrogen assimilation in addition to its previously established regulatory role in nitrogen catabolism.

Aspergillus, Nitrogen metabolism

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Purification and preliminary characterization of permethrinase from a pyrethroid-transforming strain of Bacillus cereus

Article Abstract:

Bacillus cereus SM3 was originally described as a hydrolyzer of a number of pyrethroids while using Tween 80 as the main carbon source. The enzyme responsible for pyrethroid degradation was purified and characterized. The enyzme, termed permethrinase, is a tetramer with a molecular weight of about 61-kDa and displays distinctive carboxylesterase activity. The enzyme could be developed as a pyrthroid detoxifier with possible industrial applications.

Esterases, Biodegradation, Identification and classification, Microbial enzymes, Pesticides, Pyrethroids

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Cloning of the beta-amylase gene from Bacillus cereus and characteristics ofthe primary structure of the enzyme

Article Abstract:

The complete strucure of the beta-amylase from Bacillus cereus and the novel features of this structure are discussed. Experiments involved the cloning of the Bacillus cereus beta-amylase gene, partial sequence homology of beta-amylase and the conserved amino acid sequence in beta-amylase. It was found that an extra raw-starch-binding domain exists in B. cereus beta amylase.

Analysis, Enzymes, Amylases

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