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A yeast plasmid partitioning protein is a karyoskeletal component
The Journal of Biological Chemistry
|January 15, 1987
Summary
The Saccharomyces yeast 2-micron plasmid partitioning system relies on REP1 protein, found in the nucleus. This protein may anchor plasmid DNA to the nuclear lamina for accurate cell division.
Area of Science:
- Molecular Biology
- Yeast Genetics
- Cell Biology
Background:
- The 2-micron circle plasmid in Saccharomyces cerevisiae ensures its stable inheritance through a partitioning system.
- This system involves REP1 and REP2 proteins and the REP3 locus.
Purpose of the Study:
- To identify the location and cellular interactions of the REP1 protein.
- To elucidate the mechanism by which REP1 facilitates plasmid partitioning.
Main Methods:
- Antibodies were generated against a REP1 beta-galactosidase fusion protein.
- Immunofluorescence and co-purification techniques were used to study REP1 localization and interactions in yeast cells.
Main Results:
- REP1 protein was found exclusively within the yeast nucleus.
- REP1 co-purified with a nuclear matrix-associated fraction.
- Sequence analysis revealed homology between REP1 and cytoskeletal/nuclear lamina proteins.
Conclusions:
- REP1 protein is a nuclear component involved in plasmid partitioning.
- REP1 likely functions by interacting with the nuclear lamina to anchor plasmid molecules.
- This mechanism ensures the stable inheritance of the 2-micron plasmid during yeast cell division.