Abstract
The CDC4 gene product of Saccharomyces cerevisiae is required at the late G1 S phase boundary of the cell cycle. In an attempt to better understand the function of CDC4, we performed experiments to localize this protein in the yeast cell. Using antisera, directed against a TrpE-CDC4 fusion protein, to analyze immuno-blots of different subcellular fractions from yeast, we demonstrated that the CDC4 gene product localizes in the nucleus by two different biochemical preparations of the yeast nucleoskeletal proteins. Immunofluorescence microscopy further confirmed its nuclear localization. These data support a model that includes the CDC4 gene product as a component of the yeast nuclear skeleton. The significance of this association in relationship to the biological role of CDC4 is discussed.
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