Chromatin-remodelling factor chrac contains the atpases iswi and topoisomerase ii

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Chromatin-remodelling factor chrac contains the atpases iswi and topoisomerase ii"


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ABSTRACT Repressive chromatin structures need to be unravelled to allow DNA-binding proteins access to their target sequences. This de-repression constitutes an important point at which


transcription and presumably other nuclear processes can be regulated1,2. Energy-consuming enzyme complexes that facilitate the interaction of transcription factors with chromatin by


modifying nucleosome structure are involved in this regulation3,4,5. One such factor, nucleosome-remodelling factor (NURF), has been isolated from _Drosophila_ embryo extracts4,6,7. We have


now identified a chromatin-accessibility complex (CHRAC) which uses energy to increase the general accessibility of DNA in chromatin. However, unlike other known chromatin remodelling


factors, CHRAC can also function during chromatin assembly: it uses ATP to convert irregular chromatin into a regular array of nucleosomes with even spacing. CHRAC combines enzymes that


modulate nucleosome structure and DNA topology. Using mass spectrometry, we identified two of the five CHRAC subunits as the ATPase ISWI, which is also part of NURF6,8, and topoisomerase II.


The presence of ISWI in different contexts suggests that chromatin remodelling machines have a modular nature and that ISWI has a central role in different chromatin remodelling reactions.


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support SIMILAR CONTENT BEING VIEWED BY OTHERS STRUCTURE OF THE ISW1A COMPLEX BOUND TO THE DINUCLEOSOME Article 04 January 2024 ISWI CATALYZES NUCLEOSOME SLIDING IN CONDENSED NUCLEOSOME


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references ACKNOWLEDGEMENTS This research was supported by an EMBO fellowship to P.D.V. and by a grant for the DFG to P.B.B. We thank T. Tsukiyama and C. Wu for a generous gift of NURF


fractions and ISWI antibodies, S. Beek and J. Tamkun for antibodies against ISWI, P. Fisher and D. Arndt-Jovin for antibodies against topo II; A. Shevchenko for technical help, H.


Stunnenberg for important suggestions and discussions, T. Blank and C. Garcia-Jimenez for introduction to chromatography and P. Riedinger for artwork. AUTHOR INFORMATION AUTHORS AND


AFFILIATIONS * European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117, Heidelberg, Germany Patrick D. Varga-Weisz, Matthias Wilm, Edgar Bonte, Katia Dumas, Matthias Mann & Peter


B. Becker Authors * Patrick D. Varga-Weisz View author publications You can also search for this author inPubMed Google Scholar * Matthias Wilm View author publications You can also search


for this author inPubMed Google Scholar * Edgar Bonte View author publications You can also search for this author inPubMed Google Scholar * Katia Dumas View author publications You can also


search for this author inPubMed Google Scholar * Matthias Mann View author publications You can also search for this author inPubMed Google Scholar * Peter B. Becker View author


publications You can also search for this author inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to Peter B. Becker. RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS


ARTICLE CITE THIS ARTICLE Varga-Weisz, P., Wilm, M., Bonte, E. _et al._ Chromatin-remodelling factor CHRAC contains the ATPases ISWI and topoisomerase II. _Nature_ 388, 598–602 (1997).


https://doi.org/10.1038/41587 Download citation * Received: 29 January 1997 * Accepted: 28 May 1997 * Issue Date: 07 August 1997 * DOI: https://doi.org/10.1038/41587 SHARE THIS ARTICLE


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