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Verfasst von:Teif, Vladimir [VerfasserIn]   i
 Kepper, Nick [VerfasserIn]   i
 Yserentant, Klaus [VerfasserIn]   i
 Wedemann, Gero [VerfasserIn]   i
 Rippe, Karsten [VerfasserIn]   i
Titel:Affinity, stoichiometry and cooperativity of heterochromatin protein 1 (HP1) binding to nucleosomal arrays
Verf.angabe:Vladimir B. Teif, Nick Kepper, Klaus Yserentant, Gero Wedemann and Karsten Rippe
E-Jahr:2015
Jahr:7 January 2015
Umfang:10 S.
Fussnoten:Gesehen am 30.06.2020
Titel Quelle:Enthalten in: Journal of physics / Condensed matter
Ort Quelle:Bristol : IOP Publ., 1989
Jahr Quelle:2015
Band/Heft Quelle:27(2015,6) Artikel-Nummer 064110, 10 Seiten
ISSN Quelle:1361-648X
Abstract:Heterochromatin protein 1 (HP1) participates in establishing and maintaining heterochromatin via its histone-modification-dependent chromatin interactions. In recent papers HP1 binding to nucleosomal arrays was measured in vitro and interpreted in terms of nearest-neighbour cooperative binding. This mode of chromatin interaction could lead to the spreading of HP1 along the nucleosome chain. Here, we reanalysed previous data by representing the nucleosome chain as a 1D binding lattice and showed how the experimental HP1 binding isotherms can be explained by a simpler model without cooperative interactions between neighboring HP1 dimers. Based on these calculations and spatial models of dinucleosomes and nucleosome chains, we propose that binding stoichiometry depends on the nucleosome repeat length (NRL) rather than protein interactions between HP1 dimers. According to our calculations, more open nucleosome arrays with long DNA linkers are characterized by a larger number of binding sites in comparison to chains with a short NRL. Furthermore, we demonstrate by Monte Carlo simulations that the NRL dependent folding of the nucleosome chain can induce allosteric changes of HP1 binding sites. Thus, HP1 chromatin interactions can be modulated by the change of binding stoichiometry and the type of binding to condensed (methylated) and non-condensed (unmethylated) nucleosome arrays in the absence of direct interactions between HP1 dimers.
DOI:doi:10.1088/0953-8984/27/6/064110
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1088/0953-8984/27/6/064110
 DOI: https://doi.org/10.1088/0953-8984/27/6/064110
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1702898458
Verknüpfungen:→ Zeitschrift

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