PMID: 8604294Feb 15, 1996Paper

Binding to the yeast SwI4,6-dependent cell cycle box, CACGAAA, is cell cycle regulated in vivo

Nucleic Acids Research
L A Harrington, Brenda Andrews

Abstract

In Saccharomyces cerevisiae commitment to cell division occurs late in the G1 phase of the cell cycle at a point called Start and requires the activity of the Cdc28 protein kinase and its associated G1 cyclins. The Swi4,6-dependent cell cycle box binding factor, SBF, is important for maximal expression of the G1 cyclin and HO endonuclease genes at Start. The cell cycle regulation of these genes is modulated through an upstream regulatory element termed the SCB (SwI4,6-dependent cell cycle box, CACGAAA), which is dependent on both SWI4 and SWI6. Although binding of SWI4 and SWI6 to SCB sequences has been well characterized in vitro, the binding of SBF in vivo has not been examined. We used in vivo dimethyl sulfate footprinting to examine the occupancy of SCB sequences throughout the cell cycle. We found that binding to SCB sequences occurred in the G1 phase of the cell cycle and was greatly reduced in G2. In the absence of either SWI4 or SWI6, SCB sequences were not occupied at any cell cycle stage. These results suggest that the G1-specific expression of SCB-dependent genes is regulated at the level of DNA binding in vivo.

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Citations

Aug 29, 2006·Oncogene·K Cooper
Dec 5, 2002·Genes & Development·Christine E HorakMichael Snyder
Sep 17, 2008·Molecular and Cellular Biology·Robertus A M de BruinCurt Wittenberg
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