Conformational dynamics of DNA affected by intercalation and minor groove binding: direct observation of large DNA.
Using fluorescence microscopy, we have observed moving DNA molecules in solution and analyzed the "higher-order" structure in a quantitative manner. It was found that EB (ethidium bromide), an intercalator, has the effect to increase the persistent length. In other words, EB expands DNA. Whereas, DAPI (4',6-diamidino-2-phenylindole), a minor groove binding drug, decreases the persistent length. It is demonstrated that the direct observation of DNA molecules with fluorescence microscopy is quite useful to study the interaction of various chemical compounds with DNA molecules.
Matsuzawa
Y
Y
College of General Education, Nagoya University, Japan.
Minagawa
K
K
Yoshikawa
K
K
Matsumoto
M
M
Doi
M
M
D017122:Bacteriophage T4 / Q000235:genetics; D004279:DNA, Viral / Q000737:chemistry* / Q000187:drug effects; D004996:Ethidium / Q000494:pharmacology; D005456:Fluorescent Dyes / Q000494:pharmacology; D007211:Indoles / Q000494:pharmacology; D007364:Intercalating Agents / Q000494:pharmacology*; D008856:Microscopy, Fluorescence; D015394:Molecular Structure; D009690:Nucleic Acid Conformation / Q000187:drug effects*
D004279:DNA, Viral; D005456:Fluorescent Dyes; D007211:Indoles; D007364:Intercalating Agents; C007293:DAPI; D004996:Ethidium