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1: Science. 2003 Jan 3;299(5603):112-4. Epub 2002 Nov 14.Click here to read Links

Modulation of ATP-dependent chromatin-remodeling complexes by inositol polyphosphates.

Shen X, Xiao H, Ranallo R, Wu WH, Wu C.

Laboratory of Molecular Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-4255, USA.

Eukaryotes use adenosine triphosphate (ATP)-dependent chromatin-remodeling complexes to regulate gene expression. Here, we show that inositol polyphosphates can modulate the activities of several chromatin-remodeling complexes in vitro. Inositol hexakisphosphate (IP6) inhibits nucleosome mobilization by NURF, ISW2, and INO80 complexes. In contrast, nucleosome mobilization by the yeast SWI/SNF complex is stimulated by inositol tetrakisphosphate (IP4) and inositol pentakisphosphate (IP5). We demonstrate that mutations in genes encoding inositol polyphosphate kinases that produce IP4, IP5, and IP6 impair transcription in vivo. These results provide a link between inositol polyphosphates, chromatin remodeling, and gene expression.

PMID: 12434013 [PubMed - indexed for MEDLINE]