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Papers In Press, published online ahead of print January 24, 2001
J. Biol. Chem, 10.1074/jbc.M010470200
Submitted on November 20, 2000
Revised on January 23, 2001
Accepted on January 24, 2001
Biochemistry & Molecular Biology, Southern Illinois University School of Medicine, Carbondale, Illinois 62901-4413
Corresponding Author: bbartholomew{at}siumed.edu
Interactions of the yeast chromatin remodeling complexes SWI/SNF and RSC with nucleosomes were probed using site-specific DNA photoaffinity labeling. 5S rDNA was engineered with photoreactive nucleotides incorporated at different sites in DNA to scan for the subunits of SWI/SNF in close proximity to DNA when SWI/SNF is bound to the 5S nucleosome or to free 5S rDNA. The Swi2/Snf2 and Snf6 subunits of SWI/SNF were efficiently cross-linked at several positions in the nucleosome, whereas only Snf6 was efficiently cross-linked when SWI/SNF is bound to free DNA. DNA photoaffinity labeling of RSC showed that the Rsc4 subunit is in close proximity to nucleosomal DNA and not when RSC is bound to free DNA. After remodeling, the Swi2/Snf2 and Rsc4 subunits are no longer detected near the nucleosomal DNA and are evidently displaced from the surface of the nucleosome, indicating significant changes in SWI/SNF and RSC contacts with DNA after remodeling.
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