DNA Binding to the Silica Surface

Bobo Shi, Yun Kyung Shin, Ali A. Hassanali, Sherwin J. Singer

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

We investigate the DNA-silica binding mechanism using molecular dynamics simulations. This system is of technological importance, and also of interest to explore how egatively charged DNA can bind to a silica surface, whichs method (WHAM) are used to calculate the free energy surface for detachment of DNA f double-stranded (dsDNA): (1) ssDNA is more flexible and therefore able to maximize the number of binding interactions. (2) ssDNA has free unpaired bases to form hydrophobic attachment to silica while dsDNA has to break hydrogen bonds with base partners to get free bases. (3) The linear charge density of dsDNA is twice that of ssDNA. We devise a procedure to approximate the atomic forces between biomolecules and amorphous silica to enable large-scale biomolecule-silica simulations as reported here. (Figure Presented).

Original languageEnglish (US)
Pages (from-to)11030-11040
Number of pages11
JournalJournal of Physical Chemistry B
Volume119
Issue number34
DOIs
StatePublished - Aug 27 2015

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All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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