ATP-dependent histone octamer sliding mediated by the chromatin remodeling complex NURF.
Drosophila NURF is an ATP-dependent chromatin remodeling complex that contains ISWI, a member of the SWI2/SNF2 family of ATPases. We demonstrate that NURF catalyzes the bidirectional redistribution of mononucleosomes reconstituted on hsp70 promoter DNA. In the presence of NURF, nucleosomes adopt one predominant position from an ensemble of possible locations within minutes. Movements occur in cis, with no transfer to competing DNA. Migrating intermediates trapped by Exo III digestion reveal progressive nucleosome motion in increments of several base pairs. All four core histones are retained quantitatively during this process, indicating that the general integrity of the histone octamer is maintained. We suggest that NURF remodels nucleosomes by transiently decreasing the activation energy for short-range sliding of the histone octamer.
Laboratory of Molecular Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, USA.
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Hamiche
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Sandaltzopoulos
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Gdula
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Wu
D000251:Adenosine Triphosphatases / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism*; D000818:Animals; D020029:Base Pairing; D002843:Chromatin / Q000502:physiology*; D004331:Drosophila melanogaster; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism; D006657:Histones / Q000378:metabolism*; D019476:Insect Proteins / Q000378:metabolism*; D009707:Nucleosomes / Q000378:metabolism / Q000502:physiology; D011401:Promoter Regions, Genetic; D012341:RNA, Ribosomal, 5S; D014157:Transcription Factors / Q000378:metabolism
D002843:Chromatin; D018840:HSP70 Heat-Shock Proteins; D006657:Histones; C086468:ISWI protein; D019476:Insect Proteins; D009707:Nucleosomes; D012341:RNA, Ribosomal, 5S; D014157:Transcription Factors; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases