[No authors listed]
We isolated the cDNA of the fission yeast mitochondrial endonuclease SpNUC1, which consists of 322 amino acids and has a significant homology with the budding yeast NUC1 and mammalian endonuclease G. Comparison of the cDNA sequence with the genomic sequence showed that the gene consists of three exons and two introns and spans 1.31 kb. The enzyme localization in mitochondria was demonstrated by expressing the SpNUC1-green fluorescent protein fusion in the yeast. The endonuclease was activated by truncation of the amino-terminal region of the protein, indicating that the enzyme is encoded as an inactive precursor. The active enzyme degraded single-stranded DNA and RNA, the activity being dependent on Mg(2+) (Mn(2+)).
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