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Isolation and initial characterization of residual nuclear structures from yeast
Experimental Cell Research
|August 1, 1984
Summary
Researchers isolated residual nuclear structures from Saccharomyces cerevisiae, finding they retain minimal DNA, RNA, and proteins. These structures preferentially bind replicating DNA, similar to those in other organisms.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Residual nuclear structures are conserved across eukaryotes.
- These structures are obtained after treating nuclei with high salt and DNase I.
Purpose of the Study:
- To characterize residual nuclear structures from Saccharomyces cerevisiae.
- To compare these yeast structures with those from other organisms.
Main Methods:
- Isolation of nuclei from Saccharomyces cerevisiae.
- Treatment with 1.95 M NaCl and DNase I.
- Biochemical analysis of retained DNA, RNA, and proteins.
- Electron microscopy for structural analysis.
Main Results:
- Sedimentable residual nuclear structures were obtained from yeast.
- These structures retained <7% nuclear DNA, <17% RNA, and <50% proteins.
- Electron microscopy revealed a sparse fibrogranular network derived from the nuclear interior.
- Replicating DNA was preferentially bound to these structures.
Conclusions:
- Yeast residual nuclear structures share similarities with those from other eukaryotes.
- These structures serve as a scaffold for DNA replication machinery.