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Structure of the arginase coding gene and its transcript in Aspergillus nidulans
P Borsuk1, A Dzikowska, J Empel
1Department of Genetics, University of Warsaw and Institute of Biochemistry and Biophysics Polish Academy of Science, Warszawa.
Acta Biochimica Polonica
|November 5, 1999
Summary
Researchers cloned and characterized the Aspergillus nidulans arginase gene (agaA). Gene expression is regulated by different transcript 5
Area of Science:
- Molecular Biology
- Fungal Genetics
- Gene Regulation
Background:
- Arginase (agaA) is a key enzyme in nitrogen metabolism.
- Understanding its regulation is crucial for fungal physiology.
Purpose of the Study:
- To clone and characterize the Aspergillus nidulans arginase structural gene (agaA).
- To investigate the regulatory mechanisms of agaA gene expression.
Main Methods:
- Gene cloning and characterization techniques.
- Analysis of mRNA transcripts and their 5' ends.
- Bioinformatic prediction of secondary mRNA structures.
Main Results:
- The Aspergillus nidulans arginase gene (agaA) was successfully cloned and characterized.
- agaA transcripts exhibit heterogeneity in their 5' ends, influenced by growth conditions.
- The messenger RNA (mRNA) contains a long 5' untranslated region (UTR) with potential secondary structures.
- Putative arginine-binding aptamers were identified within the 5' UTR.
Conclusions:
- Differential transcription initiation or mRNA processing affects agaA expression.
- The 5' UTR's structure and potential aptamers suggest a novel regulatory mechanism for agaA.
- This finding offers insights into the complex regulation of fungal gene expression.