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Single-molecule kinetic analysis of HP1-chromatin binding reveals a dynamic network of histone modification and DNA interactions

Bryan, Louise C ; Weilandt, Daniel R ; Bachmann, Andreas L ; Kilic, Sinan ; Lechner, Carolin C ; Odermatt, Pascal D ; Fantner, Georg E ; Georgeon, Sandrine ; Hantschel, Oliver ; Hatzimanikatis, Vassily ; Fierz, Beat

Nucleic acids research, 2017-10, Vol.45 (18), p.10504-10517 [Periódico revisado por pares]

England: Oxford University Press

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Single-molecule kinetic analysis of HP1-chromatin binding reveals a dynamic network of histone modification and DNA interactions
Autor: Bryan, Louise C ; Weilandt, Daniel R ; Bachmann, Andreas L ; Kilic, Sinan ; Lechner, Carolin C ; Odermatt, Pascal D ; Fantner, Georg E ; Georgeon, Sandrine ; Hantschel, Oliver ; Hatzimanikatis, Vassily ; Fierz, Beat
Assuntos: Animals ; Chromatin - metabolism ; Chromosomal Proteins, Non-Histone - metabolism ; DNA - metabolism ; Epigenesis, Genetic ; Gene Expression Regulation ; Gene regulation, Chromatin and Epigenetics ; Histone Code - physiology ; Histones - metabolism ; Humans ; In Vitro Techniques ; Kinetics ; Mice ; NIH 3T3 Cells ; Phosphorylation ; Protein Binding ; Protein Processing, Post-Translational ; Single Molecule Imaging
É parte de: Nucleic acids research, 2017-10, Vol.45 (18), p.10504-10517
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SourceType-Scholarly Journals-1
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These authors contributed equally to the paper as first authors.
Descrição: Chromatin recruitment of effector proteins involved in gene regulation depends on multivalent interaction with histone post-translational modifications (PTMs) and structural features of the chromatin fiber. Due to the complex interactions involved, it is currently not understood how effectors dynamically sample the chromatin landscape. Here, we dissect the dynamic chromatin interactions of a family of multivalent effectors, heterochromatin protein 1 (HP1) proteins, using single-molecule fluorescence imaging and computational modeling. We show that the three human HP1 isoforms are recruited and retained on chromatin by a dynamic exchange between histone PTM and DNA bound states. These interactions depend on local chromatin structure, the HP1 isoforms as well as on PTMs on HP1 itself. Of the HP1 isoforms, HP1α exhibits the longest residence times and fastest binding rates due to DNA interactions in addition to PTM binding. HP1α phosphorylation further increases chromatin retention through strengthening of multivalency while reducing DNA binding. As DNA binding in combination with specific PTM recognition is found in many chromatin effectors, we propose a general dynamic capture mechanism for effector recruitment. Multiple weak protein and DNA interactions result in a multivalent interaction network that targets effectors to a specific chromatin modification state, where their activity is required.
Editor: England: Oxford University Press
Idioma: Inglês

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Single-molecule kinetic analysis of HP1-chromatin binding reveals a dynamic network of histone modification and DNA interactions

Bryan, Louise C ; Weilandt, Daniel R ; Bachmann, Andreas L ; Kilic, Sinan ; Lechner, Carolin C ; Odermatt, Pascal D ; Fantner, Georg E ; Georgeon, Sandrine ; Hantschel, Oliver ; Hatzimanikatis, Vassily ; Fierz, Beat

England: Oxford University Press

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