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Eukaryotes use adenosine triphosphate (ATP)-dependent
chromatin-remodeling complexes to regulate gene expression. Here, weshow that inositol polyphosphates can modulate the activitiesof
several chromatin-remodeling complexes in vitro. Inositol
hexakisphosphate(IP6) inhibits nucleosome mobilization by
NURF, ISW2, and INO80complexes. In contrast, nucleosome mobilization
by the yeast SWI/SNFcomplex is stimulated by inositol
tetrakisphosphate (IP4) andinositol pentakisphosphate
(IP5). We demonstrate that mutationsin genes encoding
inositol polyphosphate kinases that produceIP4,
IP5, and IP6 impair transcription in vivo.
These resultsprovide a link between inositol polyphosphates, chromatin
remodeling,and gene expression.
Laboratory of Molecular Cell Biology, Center for Cancer Research,
National Cancer Institute, National Institutes of Health, Bethesda, MD
20892-4255, USA.
*
Present address: Department of Carcinogenesis, University of
Texas MD Anderson Cancer Center, Science Park Research Division,Smithville, TX 78957, USA.
To whom correspondence should be addressed. E-mail:
carlwu{at}helix.nih.gov
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