Stochastic Binding Process of Blunt-End Stacking of DNA Molecules Observed by Atomic Force Microscopy.
Langmuir
; 34(49): 15078-15083, 2018 12 11.
Article
em En
| MEDLINE
| ID: mdl-30179510
ABSTRACT
Hydrophobic attraction is often a physical origin of nonspecific and irreversible (uncontrollable) processes observed for colloidal and biological systems, such as aggregation, precipitation, and fouling with biomolecules. On the contrary, blunt-end stacking of complementary DNA duplex chain pairs, which is also mainly driven by hydrophobic interaction, is specific and stable enough to lead to self-assemblies of DNA nanostructures. To understand the reason behind these contradicting phenomena, we measured forces operating between two self-assembled monolayers of duplexed DNA molecules with blunt ends (DNA-SAMs) and analyzed their statistics. We found the high specificity and stability of blunt-end stacking that resulted in the high resemblance between the interaction forces measured on approaching and retracting. The other finding is on the stochastic formation process of blunt-end stacking, which appeared as a significant fluctuation of the interaction forces at separations smaller than 2.5 nm. Based on these results, we discuss the underlying mechanism of the specificity and stability of blunt-end stacking.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
DNA
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article