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In vitro reconstitution and biochemical analyses of the Schizosaccharomyces pombe nucleosome.

Schizosaccharomyces pombe, which has a small genome but shares many physiological functions with higher eukaryotes, is a useful single-cell, model eukaryotic organism. In particular, many features concerning chromatin structure and dynamics, including heterochromatin, centromeres, telomeres, and DNA replication origins, are well conserved between S. pombe and higher eukaryotes. However, the S. pombe nucleosome, the fundamental structural unit of chromatin, has not been reconstituted in vitro. In the present study, we established the method to purify S. pombe histones H2A, H2B, H3, and H4, and successfully reconstituted the S. pombe nucleosome in vitro. Our thermal stability assay and micrococcal nuclease treatment assay revealed that the S. pombe nucleosome is markedly unstable and its DNA ends are quite accessible, as compared to the canonical human nucleosome. These findings are important to understand the mechanisms of epigenetic genomic DNA regulation in fission yeast.

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