Self-assembly of mesogenic bent-core DNA nanoduplexes.
Soft Matter
; 11(15): 2934-44, 2015 Apr 21.
Article
em En
| MEDLINE
| ID: mdl-25793909
ABSTRACT
Short cylinder-like DNA duplexes, comprising 6 to 20 base pairs, self-assemble into semi-flexible chains, due to coaxial stacking interactions between their blunt ends. The mutual alignment of these chains gives rise to macroscopically orientationally ordered liquid crystal phases. Interestingly, experiments show that the isotropic-nematic phase boundary is sequence-dependent. We perform all-atom simulations of several sequences to gain insights into the structural properties of the duplex and correlate the resulting geometric properties with the observed location of the isotropic-nematic phase boundary. We identify in the duplex bending the key parameter for explaining the sequence dependence, suggesting that DNA duplexes can be assimilated to bent-core mesogens. We also develop a coarse-grained model for the different DNA duplexes to evaluate in detail how bending affects the persistence length and excluded volume of the aggregates. This information is fed into a recently developed formalism to predict the isotropic-nematic phase boundary for bent-core mesogens. The theoretical results agree with the experimental observations.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
DNA
/
Modelos Moleculares
/
Nanoestruturas
Tipo de estudo:
Health_economic_evaluation
/
Prognostic_studies
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article