ArticleMolecular genetics and genomics : MGG2007
Cloning and functional characterization of the copper/zinc superoxide dismutase gene from the heavy-metal-tolerant yeast Cryptococcus liquefaciens strain N6.
Article in Molecular genetics and genomics : MGG, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The deep-sea yeast Cryptococcus liquefaciens strain N6 possesses high superoxide dismutase (SOD) activity and a high tolerance toward metal ions. To clarify the relationship between metal tolerance and SOD activity in this strain, we cloned the Cu/Zn SOD gene. This gene (Cl-SOD1) consists of 471 bp encoding 157 amino acids; the associated protein had 59.9-76.7% identity with Cu/Zn SOD proteins of other yeast species. The highest identity corresponded to Cryptococcus gattii (76.7%). Cl-SOD1 expression in the sod1 mutant of Saccharomyces cerevisiae revealed that this SOD protein was functional in S. cerevisiae. The Cl-SOD1 protein possessed approximately fourfold greater activity than S. cerevisiae SOD1 (Sc-SOD1) at 30 degrees C. The amount of Cl-SOD1 mRNA in strain N6 increased in the presence of copper ion. However, the level of this transcript was not dependent on an increase in copper ion concentration and did not correlate well with changes in the amount of Cu/Zn SOD protein. This result suggests that strain N6 possesses other Cu/Zn SOD genes induced in a manner different from Cl-SOD1 as found in Candida albicans, or that the Cl-SOD1 gene undergoes posttranscriptional regulation upon increase of copper ion.
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