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Cyclin E associates with BAF155 and BRG1, components of the mammalian SWI-SNF complex, and alters the ability of BRG1 to induce growth arrest.

Authors:
Shanahan F, Seghezzi W, Parry D, Mahony D, Lees E
Affiliation:
Journal:
Molecular and cellular biology

Abstract

SWI-SNF complexes have been implicated in transcriptional regulation by chromatin remodeling. We have identified an interaction between two components of the mammalian SWI-SNF complex and cyclin E, an essential cell cycle regulatory protein required for G1/S transition. BRG1 and BAF155, mammalian homologs of yeast SWI2 and SWI3, respectively, are found in cyclin E complexes and are phosphorylated by cyclin E-associated kinase activity. In this report, we show that overexpression of BRG1 causes growth arrest and induction of senescence-associated beta-galactosidase activity, which can be overcome by cyclin E. Our results suggest that cyclin E may modulate the activity of the SWI-SNF apparatus to maintain the chromatin in a transcriptionally permissive state.

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