Journal
NUCLEIC ACIDS RESEARCH
Volume 46, Issue 17, Pages 9189-9200Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nar/gky670
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Funding
- Agence Nationale de la Recherche [ANR-06-PCVI-0029]
- Investissements d'Avenir' LabEx PALM [ANR-10-LABX-0039-PALM]
- German Research Foundation [EL 861/1-1]
- CNRS UMR 8502 Deutsche Forschungsgemeinschaft [EL 861/1-1]
- Laboratoire de Physique des Solides
- Agence Nationale de la Recherche (ANR) [ANR-06-PCVI-0029] Funding Source: Agence Nationale de la Recherche (ANR)
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In Eukaryotes, DNA is wound around the histone octamer forming the basic chromatin unit, the nucleosome. Atomic structures have been obtained from crystallography and single particle cryo-electron microscopy (cryoEM) of identical engineered particles. But native nucleosomes are dynamical entities with diverse DNA sequence and histone content, and little is known about their conformational variability, especially in the cellular context. Using cryoEM and tomography of vitreous sections we analyse native nucleosomes, both in vitro, using purified particles solubilized at physiologically relevant concentrations (25-50%), and in situ, within interphase nuclei. We visualize individual nucleosomes at a level of detail that allows us to measure the distance between the DNA gyres wrapped around. In concentrated solutions, we demonstrate a salt-dependent transition, with a high salt compact conformation resembling the canonical nucleosome and an open low salt one, closer to nuclear nucleosomes. Although further particle characterization and cartography are needed to understand the relationship between this conformational variability and chromatin functional states, this work opens a route to chromatin exploration in situ.
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