The kinetic landscape of nucleosome assembly: A coarse-grained molecular dynamics study
The organization of nucleosomes along the Eukaryotic genome is maintained over time despite disruptive events such as replication. During this complex process, histones and DNA can form a variety of non-canonical nucleosome conformations, but their precise molecular details and roles during nucleoso...
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| Veröffentlicht in: | PLoS computational biology 2021-07, Vol.17 (7), p.e1009253-e1009253 |
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| creator | Brandani, Giovanni B Tan, Cheng Takada, Shoji |
| description | The organization of nucleosomes along the Eukaryotic genome is maintained over time despite disruptive events such as replication. During this complex process, histones and DNA can form a variety of non-canonical nucleosome conformations, but their precise molecular details and roles during nucleosome assembly remain unclear. In this study, employing coarse-grained molecular dynamics simulations and Markov state modeling, we characterized the complete kinetics of nucleosome assembly. On the nucleosome-positioning 601 DNA sequence, we observe a rich transition network among various canonical and non-canonical tetrasome, hexasome, and nucleosome conformations. A low salt environment makes nucleosomes stable, but the kinetic landscape becomes more rugged, so that the system is more likely to be trapped in off-pathway partially assembled intermediates. Finally, we find that the co-operativity between DNA bending and histone association enables positioning sequence motifs to direct the assembly process, with potential implications for the dynamic organization of nucleosomes on real genomic sequences. |
| doi_str_mv | 10.1371/journal.pcbi.1009253 |
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| subjects | Assembly Biology and Life Sciences Deoxyribonucleic acid DNA Experiments Genomes Histones Intermediates Kinetics Mathematical models Medicine and Health Sciences Molecular dynamics Nucleosomes Nucleotide sequence Physical Sciences Research and Analysis Methods Simulation |
| title | The kinetic landscape of nucleosome assembly: A coarse-grained molecular dynamics study |
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