Tension-dependent free energies of nucleosome unwrapping
Abstract
Here, nucleosomes form the basic unit of compaction within eukaryotic genomes, and their locations represent an important, yet poorly understood, mechanism of genetic regulation. Quantifying the strength of interactions within the nucleosome is a central problem in biophysics and is critical to understanding how nucleosome positions influence gene expression. By comparing to single-molecule experiments, we demonstrate that a coarse-grained molecular model of the nucleosome can reproduce key aspects of nucleosome unwrapping. Using detailed simulations of DNA and histone proteins, we calculate the tension-dependent free energy surface corresponding to the unwrapping process. The model reproduces quantitatively the forces required to unwrap the nucleosome and reveals the role played by electrostatic interactions during this process. We then demonstrate that histone modifications and DNA sequence can have significant effects on the energies of nucleosome formation. Most notably, we show that histone tails contribute asymmetrically to the stability of the outer and inner turn of nucleosomal DNA and that depending on which histone tails are modified, the tension-dependent response is modulated differently.
- Authors:
-
- Univ. of Chicago, Chicago, IL (United States)
- Univ. of Wisconsin-Madison, Madison, WI (United States)
- Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences and Engineering Division; US Department of Commerce; National Institute of Standards and Technology (NIST); National Institutes of Health (NIH) - National Human Genome Research Institute (NHGRI)
- OSTI Identifier:
- 1332925
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Central Science
- Additional Journal Information:
- Journal Volume: 2; Journal Issue: 9; Journal ID: ISSN 2374-7943
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Lequieu, Joshua, Cordoba, Andres, Schwartz, David C., and de Pablo, Juan J. Tension-dependent free energies of nucleosome unwrapping. United States: N. p., 2016.
Web. doi:10.1021/acscentsci.6b00201.
Lequieu, Joshua, Cordoba, Andres, Schwartz, David C., & de Pablo, Juan J. Tension-dependent free energies of nucleosome unwrapping. United States. https://doi.org/10.1021/acscentsci.6b00201
Lequieu, Joshua, Cordoba, Andres, Schwartz, David C., and de Pablo, Juan J. Tue .
"Tension-dependent free energies of nucleosome unwrapping". United States. https://doi.org/10.1021/acscentsci.6b00201. https://www.osti.gov/servlets/purl/1332925.
@article{osti_1332925,
title = {Tension-dependent free energies of nucleosome unwrapping},
author = {Lequieu, Joshua and Cordoba, Andres and Schwartz, David C. and de Pablo, Juan J.},
abstractNote = {Here, nucleosomes form the basic unit of compaction within eukaryotic genomes, and their locations represent an important, yet poorly understood, mechanism of genetic regulation. Quantifying the strength of interactions within the nucleosome is a central problem in biophysics and is critical to understanding how nucleosome positions influence gene expression. By comparing to single-molecule experiments, we demonstrate that a coarse-grained molecular model of the nucleosome can reproduce key aspects of nucleosome unwrapping. Using detailed simulations of DNA and histone proteins, we calculate the tension-dependent free energy surface corresponding to the unwrapping process. The model reproduces quantitatively the forces required to unwrap the nucleosome and reveals the role played by electrostatic interactions during this process. We then demonstrate that histone modifications and DNA sequence can have significant effects on the energies of nucleosome formation. Most notably, we show that histone tails contribute asymmetrically to the stability of the outer and inner turn of nucleosomal DNA and that depending on which histone tails are modified, the tension-dependent response is modulated differently.},
doi = {10.1021/acscentsci.6b00201},
journal = {ACS Central Science},
number = 9,
volume = 2,
place = {United States},
year = {Tue Aug 23 00:00:00 EDT 2016},
month = {Tue Aug 23 00:00:00 EDT 2016}
}
Web of Science
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