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. 1993 Nov;4(11):1087–1096. doi: 10.1091/mbc.4.11.1087

p63cdc13, a B-type cyclin, is associated with both the nucleolar and chromatin domains of the fission yeast nucleus.

I M Gallagher 1, C E Alfa 1, J S Hyams 1
PMCID: PMC275745  PMID: 8305731

Abstract

The cellular distribution of the fission yeast mitotic cyclin B, p63cdc13, was investigated by a combination of indirect immunofluorescence light microscopy, immunogold electron microscopy, and nuclear isolation and fractionation. Immunofluorescence microscopy of wild-type cells and the cold-sensitive mutant dis2.11 with a monospecific anti-p63cdc13 antiserum was consistent with the association of a major subpopulation of fission yeast M-phase protein kinase with the nucleolus. Immunogold electron microscopy of freeze-substituted wild-type cells identified two nuclear populations of p63cdc13, one associated with the nucleolus, the other with the chromatin domain. To investigate the cell cycle regulation of nuclear labeling, the mutant cdc25.22 was synchronized through mitosis by temperature arrest and release. Immunogold labeling of cells arrested at G2M revealed gold particles present abundantly over the nucleolus and less densely over the chromatin region of the nucleus. Small vesicles around the nucleus were also labeled by anti-p63cdc13, but few gold particles were detected over the cytoplasm. Labeling of all cell compartments declined to zero through mitosis. Cell fractionation confirmed that p63cdc13 was substantially enriched in both isolated nuclei and in a fraction containing small vesicles and organelles. p63cdc13 was not extracted from nuclei by treatment with RNase A, Nonidet P40 (NP-40), Triton X-100, and 0.1 M NaCl, although partial solubilization was observed with DNase I and 1 M NaCl. A known nucleolar protein NOP1, partitioned in a similar manner to p63cdc13, as did p34cdc2, the other subunit of the M-phase protein kinase. We conclude that a major subpopulation of the fission yeast mitotic cyclin B is targeted to structural elements of the nucleus and nucleolus.

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