Dynamic binding of histone H1 to chromatin in living cells - PubMed

Affiliations

• PMID: 11130729
• DOI: 10.1038/35048610

Dynamic binding of histone H1 to chromatin in living cells

T Misteli et al. Nature. 2000.

Abstract

The linker histone H1 is believed to be involved in chromatin organization by stabilizing higher-order chromatin structure. Histone H1 is generally viewed as a repressor of transcription as it prevents the access of transcription factors and chromatin remodelling complexes to DNA. Determining the binding properties of histone H1 to chromatin in vivo is central to understanding how it exerts these functions. We have used photobleaching techniques to measure the dynamic binding of histone H1-GFP to unperturbed chromatin in living cells. Here we show that almost the entire population of H1-GFP is bound to chromatin at any one time; however, H1-GFP is exchanged continuously between chromatin regions. The residence time of H1-GFP on chromatin between exchange events is several minutes in both euchromatin and heterochromatin. In addition to the mobile fraction, we detected a kinetically distinct, less mobile fraction. After hyperacetylation of core histones, the residence time of H1-GFP is reduced, suggesting a higher rate of exchange upon chromatin remodelling. These results support a model in which linker histones bind dynamically to chromatin in a stop-and-go mode.

Comment in

• The dynamic nucleus.

  Schuldt A. Schuldt A. Nat Rev Mol Cell Biol. 2010 Oct;11(10):678-9. doi: 10.1038/nrm2983. Nat Rev Mol Cell Biol. 2010. PMID: 20861872 No abstract available.

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