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Reference: Watabe H, et al. (1983) A new class of site-specific endodeoxyribonucleases. Endo.Sce I isolated from a eukaryote, Saccharomyces cerevisiae. J Biol Chem 258(8):4663-5

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Abstract


We had found that yeasts had intracellular endodeoxyribonucleases that cut phage DNA into a set of double-stranded fragments with discrete chain lengths. We purified one of them to apparent homogeneity from Saccharomyces cerevisiae and designated it Endo.Sce I. Sequence analysis around 5 cleavage sites in plasmid DNA and phage DNA revealed that Endo.Sce I cuts a defined phosphodiester bond in each strand of double helix at the cleavage sites and produces free cohesive ends consisting of 4 nucleotides protruding at 3'-termini. However, unlike in the case of prokaryotic type II-restriction endonucleases, (i) Endo.Sce I seems to consist of two nonidentical subunits, (ii) no common palindrome or consensus sequence including more than 5 base pairs is detected at or near these cleavage sites, and (iii) Endo.Sce I can cut the DNA isolated from the cells that produced Endo.Sce I. All of the 5 cleavage sites are included in inverted repeats, but these inverted repeats are variable in size, nucleotide sequence, and distance between repeating units. An inverted repeat itself is not a structure recognized by Endo.Sce I. This study shows that Endo.Sce I is the first example of eukaryotic site-specific endonuclease and has properties, as described above, which distinguish it from prokaryotic restriction endonucleases.

Reference Type
Journal Article
Authors
Watabe H, Iino T, Kaneko T, Shibata T, Ando T
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