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Compaction of chromatin by diverse Polycomb group proteins requires localized regions of high charge

Open access
Grau, Daniel J., Chapman, Brad A., Garlick, Joe D., Borowsky, Mark, Francis, Nicole J., Kingston, Robert E.·2011·Genes & Development

Abstract

Polycomb group (PcG) proteins are required for the epigenetic maintenance of developmental genes in a silent state. Proteins in the Polycomb-repressive complex 1 (PRC1) class of the PcG are conserved from flies to humans and inhibit transcription. One hypothesis for PRC1 mechanism is that it compacts chromatin, based in part on electron microscopy experiments demonstrating that Drosophila PRC1 compacts nucleosomal arrays. We show that this function is conserved between Drosophila and mouse PRC1 complexes and requires a region with an overrepresentation of basic amino acids. While the active region is found in the Posterior Sex Combs (PSC) subunit in Drosophila, it is unexpectedly found in a different PRC1 subunit, a Polycomb homolog called M33, in mice. We provide experimental support for the general importance of a charged region by predicting the compacting capability of PcG proteins from species other than Drosophila and mice and by testing several of these proteins using solution assays and microscopy. We infer that the ability of PcG proteins to compact chromatin in vitro can be predicted by the presence of domains of high positive charge and that PRC1 components from a variety of species conserve this highly charged region. This supports the hypothesis that compaction is a key aspect of PcG function.

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Metadata

Authors
Grau, D. J., Chapman, B. A., Garlick, J. D., Borowsky, M., Francis, N. J., & Kingston, R. E.
Venue
Genes & Development
Published
2011-10-15
Volume
25
Issue
20
Pages
2210-2221
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2098500735
Cited by
251
References
2
Type
posted content
Language
en
Open access
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CoChat. (2026). Citation check: Compaction of chromatin by diverse Polycomb group proteins requires localized regions of high charge. https://app.cochat.ai/papers/10.1101/gad.17288211
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Grau, D. J., Chapman, B. A., Garlick, J. D., Borowsky, M., Francis, N. J., & Kingston, R. E. (2011). Compaction of chromatin by diverse Polycomb group proteins requires localized regions of high charge. Genes & Development. https://doi.org/10.1101/gad.17288211

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