MOLECULAR-CLONING OF A CDNA-ENCODING ENOLASE FROM THE FILAMENTOUS FUNGUS, ASPERGILLUS-ORYZAE

A 1.6-kbp full-length cDNA for the Aspergillus oryzae enolase gene (en oA) was cloned. The sequenced insert contained a continuous open readi ng frame of 1314 bp encoding a protein of molecular weight 47 405. Amo ng all enolases sequenced to-date, the deduced aminoacid sequence show ed the highest homology (74.9%) with Candida albicans enolase (ENO1). Strong codon biases and multiple transcription start sites downstream from CT-blocks in the 5'-flanking region suggested strong expression. enoA mRNA was found to occupy approximately 3% (w/w) of total mRNA of A. oryzae by quantitative RT-PCR. This strong transcription was depend ent on the carbon source in the medium and correlated with the growth rate of the mycelium.