Sharp melting in DNA-linked nanostructure systems

Thermodynamic models of DNA-linked polymers

Sung Yong Park, Julianne M. Gibbs-Davis, Sonbinh T. Nguyen, George C Schatz

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Sharp melting that has been found for DNA-linked nanostructure systems such as DNA-linked gold nanoparticles enhances the resolution of DNA sequence detection enough to distinguish between a perfect match and single base pair mismatches. One intriguing explanation of the sharp melting involves the cooperative dehybridization of DNA strands between the nanostructures. However, in the DNA-linked gold nanoparticle system, strong optical absorption by the gold nanoparticles hinders the direct observation of cooperativity. Here, with a combination of theory and experiment, we investigate a DNA-linked polymer system in which we can show that the optical profile of the system at 260 nm is directly related to the individual DNA dehybridization profile, providing a clear distinction from other possible mechanisms. We find that cooperativity plays a crucial role in determining both the value of the melting temperature and the shape of the melting profile well away from the melting temperature. Our analysis suggests that the dehybridization properties of DNA strands in confined or dense structures differ from DNA in solution.

Original languageEnglish
Pages (from-to)8785-8791
Number of pages7
JournalJournal of Physical Chemistry B
Volume111
Issue number30
DOIs
Publication statusPublished - Aug 2 2007

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Nanostructures
Polymers
Melting
DNA
deoxyribonucleic acid
melting
Thermodynamics
thermodynamics
polymers
Gold
Nanoparticles
gold
Melting point
strands
nanoparticles
profiles
DNA sequences
Light absorption
optical absorption
temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Sharp melting in DNA-linked nanostructure systems : Thermodynamic models of DNA-linked polymers. / Park, Sung Yong; Gibbs-Davis, Julianne M.; Nguyen, Sonbinh T.; Schatz, George C.

In: Journal of Physical Chemistry B, Vol. 111, No. 30, 02.08.2007, p. 8785-8791.

Research output: Contribution to journalArticle

Park, Sung Yong ; Gibbs-Davis, Julianne M. ; Nguyen, Sonbinh T. ; Schatz, George C. / Sharp melting in DNA-linked nanostructure systems : Thermodynamic models of DNA-linked polymers. In: Journal of Physical Chemistry B. 2007 ; Vol. 111, No. 30. pp. 8785-8791.
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