Direct measurement of conformational changes on DNA molecule intercalating with a fluorescence dye in an electrophoretic buffer solution by means of atomic force microscopy

Noritada Kaji, Masanori Ueda, Yoshinobu Baba

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

By means of atomic force microscopy (AFM), we performed the direct imaging of DNA molecules (200, 500, 1000 bp) in a Tris-borate buffer solution, and measured the contour length and the end-to-end distance of DNA. Processing the data according to the worm-like chain model, we calculated the persistence length of the double-stranded DNA. Based on the analysis of the contour length and the persistence length, we discussed the interactions between DNA and an intercalating fluorescence dye (YO-PRO-1). YO-PRO-1 stacks between the base pairs and extends the contour length of DNA, changing the electric charge and the persistence length of DNA. From AFM measurement, we investigated directly the relationship between the persistence length and the number of the YO-PRO-1 intercalating to DNA. We will discuss on the relationship between the effect of an intercalating dye on the electrophoretic behavior and the conformational changes of DNA with an intercalating dye.

Original languageEnglish
Pages (from-to)3357-3364
Number of pages8
JournalELECTROPHORESIS
Volume22
Issue number16
DOIs
Publication statusPublished - Oct 25 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry

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