A yeast plasmid partitioning protein is a karyoskeletal component

L. C.C. Wu, P. A. Fisher, James Broach

Research output: Contribution to journalArticle

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Abstract

The Saccharomyces yeast plasmid, 2-μm circle, encodes a partitioning system that ensures equidistribution of plasmid molecules to both progeny following cell division. This system consists of two proteins encoded in plasmid genes REP1 and REP2 and a cis-active noncoding locus, designated REP3. We have raised antibodies against a REP1 β-galactosidase fusion protein and used them to identify the authentic REP1 protein in plasmid-bearing yeast cells. We find that REP1 protein is located exclusively in the nucleus and co-purifies with a karyoskeletal protein subfraction operationally and morphologically equivalent to the nuclear matrix-pore complex-lamina fraction of higher cells. The carboxyl half of the REP1 protein exhibits strong sequence homology to myosin heavy chain, vimentin, and nuclear lamins A and C, indicating a fibrous structure for the protein. From these observations, we suggest that REP1 protein may promote plasmid partitioning by intercalating into the nuclear lamina of the host cell to provide dispersed anchorage sites for attachment of plasmid molecules.

Original languageEnglish (US)
Pages (from-to)883-891
Number of pages9
JournalJournal of Biological Chemistry
Volume262
Issue number2
StatePublished - Jan 1 1987

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Yeast
Plasmids
Yeasts
Proteins
Scleroproteins
Nuclear Lamina
Galactosidases
Lamin Type A
Bearings (structural)
Nuclear Matrix
Nuclear Pore
Cells
Saccharomyces
Myosin Heavy Chains
Vimentin
Molecules
Sequence Homology
Cell Division
Fusion reactions
Genes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Wu, L. C.C. ; Fisher, P. A. ; Broach, James. / A yeast plasmid partitioning protein is a karyoskeletal component. In: Journal of Biological Chemistry. 1987 ; Vol. 262, No. 2. pp. 883-891.
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A yeast plasmid partitioning protein is a karyoskeletal component. / Wu, L. C.C.; Fisher, P. A.; Broach, James.

In: Journal of Biological Chemistry, Vol. 262, No. 2, 01.01.1987, p. 883-891.

Research output: Contribution to journalArticle

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