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Mol Cell Biol. 1987 October; 7(10): 3678–3687.
PMCID: PMC368023

Immunofluorescence localization of the Saccharomyces cerevisiae CDC12 gene product to the vicinity of the 10-nm filaments in the mother-bud neck.


Budding cells of the yeast Saccharomyces cerevisiae possess a ring of 10-nm-diameter filaments, of unknown biochemical nature, that lies just inside the plasma membrane in the neck connecting the mother cell to its bud (B. Byers and L. Goetsch, J. Cell Biol. 69:717-721, 1976). Mutants defective in any of four genes (CDC3, CDC10, CDC11, and CDC12) lack these filaments and display a pleiotropic phenotype that involves abnormal bud growth and cell-wall deposition and an inability to complete cytokinesis. We fused the cloned CDC12 gene to the Escherichia coli lacZ and trpE genes and used the resulting fusion proteins to raise polyclonal antibodies specific for the CDC12 gene product. In immunofluorescence experiments with affinity-purified antibodies, the neck region of wild-type and mutant cells stained in patterns consistent with the hypothesis that the CDC12 gene product is a constituent of the ring of 10-nm filaments. Without careful affinity purification of the CDC12-specific antibodies, these staining patterns were completely obscured by the staining of residual cell wall components in the neck by antibodies present even in the "preimmune" sera of all rabbits tested.

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Selected References

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