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Supramolecular Organization in Self-Assembly of Chromatin and Cationic Lipid Bilayers is Controlled by Membrane Charge Density

Berezhnoy, Nikolay V.; Lundberg, Dan LU ; Korolev, Nikolay; Lu, Chenning; Yan, Jiang; Miguel, Maria; Lindman, Björn LU and Nordenskioeld, Lars (2012) In Biomacromolecules 13(12). p.4146-4157
Abstract
In this work we have investigated the structures of aggregates formed in model systems of dilute aqueous mixtures of "model chromatin" consisting of either recombinant nucleosome core particles (NCPs) or nucleosome arrays consisting of 12 NCPs connected with 30 bp linker DNA, and liposomes made from different mixtures of cationic and zwitterionic lipids, 1,2-dioleoyl-3-trimethylammonium-propane chloride salt (DOTAP) and 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC). The aggregates formed were characterized using different optical microscopy methods and small-angle X-ray scattering (SAXS), and the results are discussed in terms of the competing intermolecular interactions among the components. For a majority of the samples, the presence... (More)
In this work we have investigated the structures of aggregates formed in model systems of dilute aqueous mixtures of "model chromatin" consisting of either recombinant nucleosome core particles (NCPs) or nucleosome arrays consisting of 12 NCPs connected with 30 bp linker DNA, and liposomes made from different mixtures of cationic and zwitterionic lipids, 1,2-dioleoyl-3-trimethylammonium-propane chloride salt (DOTAP) and 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC). The aggregates formed were characterized using different optical microscopy methods and small-angle X-ray scattering (SAXS), and the results are discussed in terms of the competing intermolecular interactions among the components. For a majority of the samples, the presence of lamellar structures could be identified. Ir. samples with high fractions of DOTAP in the liposomes, well-defined lamellar structures very similar to those formed by the corresponding lipid mixtures and DNA alone (i.e., without histone proteins) were observed; in these aggregates, the histones are expelled from the model chromatin. The findings suggest that, with liposomes containing large fractions of cationic lipid, the dominating driving force for aggregation is the increase in translational entropy from the release of counterions, whereas with lower fractions of the cationic lipid, the entropy of mixing of the lipids within the bilayers results in a decreased DNA-lipid attraction. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biomacromolecules
volume
13
issue
12
pages
4146 - 4157
publisher
The American Chemical Society
external identifiers
  • wos:000312035000029
  • scopus:84870906390
ISSN
1526-4602
DOI
10.1021/bm301436x
language
English
LU publication?
yes
id
6a6a61c0-1117-4eed-adc9-d2b88259bbe4 (old id 3372402)
date added to LUP
2013-02-01 13:29:21
date last changed
2017-01-01 03:24:28
@article{6a6a61c0-1117-4eed-adc9-d2b88259bbe4,
  abstract     = {In this work we have investigated the structures of aggregates formed in model systems of dilute aqueous mixtures of "model chromatin" consisting of either recombinant nucleosome core particles (NCPs) or nucleosome arrays consisting of 12 NCPs connected with 30 bp linker DNA, and liposomes made from different mixtures of cationic and zwitterionic lipids, 1,2-dioleoyl-3-trimethylammonium-propane chloride salt (DOTAP) and 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC). The aggregates formed were characterized using different optical microscopy methods and small-angle X-ray scattering (SAXS), and the results are discussed in terms of the competing intermolecular interactions among the components. For a majority of the samples, the presence of lamellar structures could be identified. Ir. samples with high fractions of DOTAP in the liposomes, well-defined lamellar structures very similar to those formed by the corresponding lipid mixtures and DNA alone (i.e., without histone proteins) were observed; in these aggregates, the histones are expelled from the model chromatin. The findings suggest that, with liposomes containing large fractions of cationic lipid, the dominating driving force for aggregation is the increase in translational entropy from the release of counterions, whereas with lower fractions of the cationic lipid, the entropy of mixing of the lipids within the bilayers results in a decreased DNA-lipid attraction.},
  author       = {Berezhnoy, Nikolay V. and Lundberg, Dan and Korolev, Nikolay and Lu, Chenning and Yan, Jiang and Miguel, Maria and Lindman, Björn and Nordenskioeld, Lars},
  issn         = {1526-4602},
  language     = {eng},
  number       = {12},
  pages        = {4146--4157},
  publisher    = {The American Chemical Society},
  series       = {Biomacromolecules},
  title        = {Supramolecular Organization in Self-Assembly of Chromatin and Cationic Lipid Bilayers is Controlled by Membrane Charge Density},
  url          = {http://dx.doi.org/10.1021/bm301436x},
  volume       = {13},
  year         = {2012},
}