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Isolation and Characterization of the nsdC Gene in Sexual Development of Aspergillus nidulans  

Kim, Hye-Ryun (Division of Life Sciences, Wonkwang University)
Han, Dong-Min (Division of Life Sciences, Wonkwang University)
Publication Information
Korean Journal of Microbiology / v.42, no.4, 2006 , pp. 246-251 More about this Journal
Abstract
A lot of mutants which cannot initiate sexual development were screened and several loci including nsdA, nsdB, nsdC, and nsdD were identified in homothallic ascomycetes Aspergillus nidulans. The NSD206, which has nsdC6 allele, showed typical phenotype of NSD (Never in sexual development) mutants. The nsdC gene was cloned by transforming NSDP697 ($nsdC^-$, $pryG^-$) with AMA1-NotI genomic library. The transforming library DNA recovered from several transformants showing wild phenotype carried about 10 kb genomic DNA insert. The DNA sequence of nsdC was analysed using GPS (Genome priming system). The nsdC gene has an open reading frame (ORF) of 1,929 bp encoding a putative polypeptide of 643 amino acids. The NsdC carries $C_2H_2C_2H_2C_2HC$ type zinc finger DNA binding domains in the middle of the polypeptide. A coiled-coil domain at its C terminus were also found. In nsdC6 allele, a single T insertion was occurred between 407-408 bp leading to the frameshift mutation and early termination of translation producing the truncated protein which has only 139 amino acids.
Keywords
Aspergillus nidulans; gene structure; nsdC; sexual development;
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