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Molecular and Cellular Biology, December 1999, p. 8451-8460, Vol. 19, No. 12
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
The Drosophila Polycomb Protein
Interacts with Nucleosomal Core Particles In Vitro via Its
Repression Domain
Achim
Breiling,1,
Edgar
Bonte,2,
Simona
Ferrari,2
Peter B.
Becker,2,§ and
Renato
Paro1,*
ZMBH, University of Heidelberg, 69120 Heidelberg,1 and EMBL, 69117 Heidelberg,2 Germany
Received 1 June 1999/Returned for modification 6 July 1999/Accepted 7 September 1999
The proteins of the Polycomb group (PcG) are required for
maintaining regulator genes, such as the homeotic selectors, stably and
heritably repressed in appropriate developmental domains. It has been
suggested that PcG proteins silence genes by creating higher-order
chromatin structures at their chromosomal targets, thus preventing the
interaction of components of the transcriptional machinery with their
cis-regulatory elements. An unresolved issue is how higher
order-structures are anchored at the chromatin base, the nucleosomal
fiber. Here we show a direct biochemical interaction of a PcG
protein
the Polycomb (PC) protein
with nucleosomal core particles in
vitro. The main nucleosome-binding domain coincides with a region in
the C-terminal part of PC previously identified as the repression
domain. Our results suggest that PC, by binding to the core particle,
recruits other PcG proteins to chromatin. This interaction could
provide a key step in the establishment or regulation of higher-order
chromatin structures.
*
Corresponding author. Mailing address: ZMBH, Im
Neuenheimer Feld 282, 69120 Heidelberg, Germany. Phone: 49-6221-54-68 78. Fax: 49-6221-54 58 93. E-mail:
paro{at}sun0.urz.uni-heidelberg.de.
Present address: Hospitale San Raffaele, DIBIT, 20132 Milan, Italy.

Present address: Department of Cell Biology, Erasmus University
Rotterdam, 3000 DR Rotterdam, The
Netherlands.
§
Present address: Adolf-Butenandt-Institut, Molekularbiologie,
Ludwig-Maximilians-Universität München, 80336 Munich,
Germany.
Molecular and Cellular Biology, December 1999, p. 8451-8460, Vol. 19, No. 12
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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